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115-499: At 264 meters, the Lousberg (historically sometimes also spelled Louisberg , Luisberg or Loysberg ) is a prominent elevation on the northern edge of the historic center of Aachen , which was laid out as a forest and mountain park at the beginning of the 19th century according to plans by Maximilian Friedrich Weyhe  [ de ] . The origin of the name is not entirely clear. It could come from lousen ("to look"), since

230-403: A debris flow or mud flow . However, also dry debris can exhibit flow-like movement. Flowing debris or mud may pick up trees, houses and cars, and block bridges and rivers causing flooding along its path. This phenomenon is particularly hazardous in alpine areas, where narrow gorges and steep valleys are conducive of faster flows. Debris and mud flows may initiate on the slopes or result from

345-466: A depth from few decimeters to some meters) is called a shallow landslide. Debris slides and debris flows are usually shallow. Shallow landslides can often happen in areas that have slopes with high permeable soils on top of low permeable soils. The low permeable soil traps the water in the shallower soil generating high water pressures. As the top soil is filled with water, it can become unstable and slide downslope. Deep-seated landslides are those in which

460-421: A design by the engineering geographer Capitaine Boucher. The obelisk is a precisely measured central point that served as a starting point for astronomical observations and mapping in the region. From there, other points in the area were determined using the triangulation method, which eventually allowed the entire area to be mapped. When Napoleon was deposed on 2 April 1814 the monument was destroyed. On 15 May 1815

575-456: A long time, the top floor of the building housed a café. The café was known for its 360° panoramic view and the automatic movement of tables around the circular area using a slow conveyor belt. A restaurant has since opened in the same space. Today, the Lousberg is largely wooded and serves as a local recreation area. The extensive park of the former St. Raphael Monastery north of the Lousberg

690-544: A low shearing resistance. On the slopes, some earthflow may be recognized by their elongated shape, with one or more lobes at their toes. As these lobes spread out, drainage of the mass increases and the margins dry out, lowering the overall velocity of the flow. This process also causes the flow to thicken. Earthflows occur more often during periods of high precipitation, which saturates the ground and builds up water pressures. However, earthflows that keep advancing also during dry seasons are not uncommon. Fissures may develop during

805-476: A popular destination for walkers, along with other features such as the Tranchot Obelisk, a Monopteros on the site of today's revolving tower, and a small Chinese pagoda . The circular path, beginning at the site of today's bronze statues, through the recently restored beech avenue on the north slope, offered spa guests and citizens different views of the city and the surrounding countryside, until all

920-530: A reconstruction of the evolution of a particular landslide. Therefore, landslide hazard mitigation measures are not generally classified according to the phenomenon that might cause a landslide. Instead, they are classified by the sort of slope stabilization method used: Climate-change impact on temperature, both average rainfall and rainfall extremes, and evapotranspiration may affect landslide distribution, frequency and intensity (62). However, this impact shows strong variability in different areas (63). Therefore,

1035-605: A result of the Variscan orogeny . After this event, and over the course of the following 200 million years, this area has been continuously flattened. During the Cretaceous period, the ocean penetrated the continent from the direction of the North Sea up to the mountainous area near Aachen, bringing with it clay, sand, and chalk deposits. While the clay (which was the basis for a major pottery industry in nearby Raeren )

1150-542: A slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall , an earthquake , a slope cut to build a road, and many others), although this is not always identifiable. Landslides are frequently made worse by human development (such as urban sprawl ) and resource exploitation (such as mining and deforestation ). Land degradation frequently leads to less stabilization of soil by vegetation . Additionally, global warming caused by climate change and other human impact on

1265-430: A very wide range, from as low as 1 mm/yr to many km/h. Though these are a lot like mudflows , overall they are more slow-moving and are covered with solid material carried along by the flow from within. Clay, fine sand and silt, and fine-grained, pyroclastic material are all susceptible to earthflows. These flows are usually controlled by the pore water pressures within the mass, which should be high enough to produce

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1380-719: Is an appropriate tool because it has functions of collection, storage, manipulation, display, and analysis of large amounts of spatially referenced data which can be handled fast and effectively. Cardenas reported evidence on the exhaustive use of GIS in conjunction of uncertainty modelling tools for landslide mapping. Remote sensing techniques are also highly employed for landslide hazard assessment and analysis. Before and after aerial photographs and satellite imagery are used to gather landslide characteristics, like distribution and classification, and factors like slope, lithology , and land use/land cover to be used to help predict future events. Before and after imagery also helps to reveal how

1495-455: Is commemorated by a group of bronze statues on the Lousberg, depicting a farmer's wife and a devil, created in 1985 by Aachen artist Krista Löneke-Kemmerling. Aachen Aachen ( / ˈ ɑː k ən / AH -kən , German: [ˈaːxn̩] ; Aachen dialect : Oche [ˈɔːxə] ; Dutch : Aken [ˈaːkə(n)] ; French: Aix-la-Chapelle ; Latin: Aquae Granni or Aquisgranum )

1610-434: Is determined by certain geologic factors, and that future landslides will occur under the same conditions as past events. Therefore, it is necessary to establish a relationship between the geomorphologic conditions in which the past events took place and the expected future conditions. Natural disasters are a dramatic example of people living in conflict with the environment. Early predictions and warnings are essential for

1725-694: Is divided into seven administrative districts, or boroughs, each with its own district council, district leader, and district authority. The councils are elected locally by those who live within the district, and these districts are further subdivided into smaller sections for statistical purposes, with each sub-district named by a two-digit number. The districts of Aachen, including their constituent statistical districts, are: Regardless of official statistical designations, there are 50 neighbourhoods and communities within Aachen, here arranged by district: The following cities and communities border Aachen, clockwise from

1840-514: Is essentially due to a decrease in the shear strength of the slope material, an increase in the shear stress borne by the material, or a combination of the two. A change in the stability of a slope can be caused by a number of factors, acting together or alone. Natural causes of landslides include: Landslides are aggravated by human activities, such as: In traditional usage, the term landslide has at one time or another been used to cover almost all forms of mass movement of rocks and regolith at

1955-457: Is fluid-like and generally much more rapid. This is usually a result of lower shear resistances and steeper slopes. Typically, debris slides start with the detachment of large rock fragments high on the slopes, which break apart as they descend. Clay and silt slides are usually slow but can experience episodic acceleration in response to heavy rainfall or rapid snowmelt. They are often seen on gentle slopes and move over planar surfaces, such as over

2070-510: Is mostly found in the lower areas of Aachen, the hills of the Aachen Forest and the Lousberg were formed from upper Cretaceous sand and chalk deposits. More recent sedimentation is mainly located in the north and east of Aachen and was formed through tertiary and quaternary river and wind activities. Along the major thrust fault of the Variscan orogeny , there are over 30 thermal springs in Aachen and Burtscheid . Additionally,

2185-544: Is provided below. Under this classification, six types of movement are recognized. Each type can be seen both in rock and in soil. A fall is a movement of isolated blocks or chunks of soil in free-fall. The term topple refers to blocks coming away by rotation from a vertical face. A slide is the movement of a body of material that generally remains intact while moving over one or several inclined surfaces or thin layers of material (also called shear zones) in which large deformations are concentrated. Slides are also sub-classified by

2300-944: Is the 13th-largest city in North Rhine-Westphalia and the 27th-largest city of Germany, with around 261,000 inhabitants. Aachen is located at the northern foothills of the High Fens and the Eifel Mountains. It sits on the Wurm River , a tributary of the Rur , and together with Mönchengladbach , it is the only larger German city in the drainage basin of the Meuse . It is the westernmost larger city in Germany, lying approximately 61 km (38 mi) west of Cologne and Bonn , directly bordering Belgium in

2415-509: The Eifel and the High Fens and its subsequent prevailing westerly weather patterns, rainfall in Aachen (on average 805 mm/year) is comparatively higher than, for example, in Bonn (with 669 mm/year). Another factor in the local weather forces of Aachen is the occurrence of Foehn winds on the southerly air currents, which results from the city's geographic location on the northern edge of

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2530-596: The Meuse , and about 30 km (19 mi) north of the High Fens , which form the northern edge of the Eifel uplands of the Rhenish Massif . The maximum dimensions of the city's territory are 21.6 km ( 13 + 3 ⁄ 8  mi) from north to south, and 17.2 km ( 10 + 3 ⁄ 4  mi) from east to west. The city limits are 87.7 km ( 54 + 1 ⁄ 2  mi) long, of which 23.8 km ( 14 + 3 ⁄ 4  mi) border Belgium and 21.8 km ( 13 + 1 ⁄ 2  mi)

2645-659: The Middle Ages , it was used in the construction of Barbarossa's Wall. At the beginning of the 19th century, the Napoleonic geographer Jean Joseph Tranchot began the topographic survey of the Rhineland at the scale of 1: 20 000 , starting from a triangulation point on the Lousberg. On 17 October 1807 the French Ministry of War erected a bluestone obelisk in honor of Tranchot and his colleagues, based on

2760-735: The Neolithic era, about 5,000 years ago, attracted to its warm mineral springs . Latin Aquae figures in Aachen's Roman name Aquae granni , which meant "waters of Grannus ", referring to the Celtic god of healing who was worshipped at the springs. This word became Åxhe in Walloon and Aix in French, and subsequently Aix-la-Chapelle to distinguish it from Aix-en-Provence , after Charlemagne had his palatine chapel built there in

2875-511: The Palace . Charlemagne spent most winters in Aachen between 792 and his death in 814. Aachen became the focus of his court and the political centre of his empire. During the Carolingian empire, a Jewish community lived near the royal palace. In Jewish texts, the city of Aachen was called Aish or Ash (אש). In 797, Isaac, a Jewish merchant, accompanied two ambassadors of Charlemagne to

2990-667: The RWTH Aachen (Rheinisch-Westfälische Technische Hochschule), known especially for mechanical engineering, automotive and manufacturing technology as well as for its research and academic hospital Klinikum Aachen , one of the largest medical facilities in Europe. Aachen is located in the middle of the Meuse–Rhine Euroregion , close to the border tripoint of Germany, the Netherlands, and Belgium . The town of Vaals in

3105-628: The Treaty of Verdun , the city was within the borders of Middle Francia , until it became part of East Francia after the Treaty of Meerssen (870). It subsequently was part of the Holy Roman Empire and was granted city rights in 1166 by Emperor Frederick Barbarossa , becoming an imperial city . It served as the coronation site where 31 Holy Roman Emperors were crowned Kings of the Germans from 936 to 1531, until Frankfurt am Main became

3220-691: The War of Devolution . The second congress ended with the second treaty in 1748, ending the War of the Austrian Succession . In 1789, there was a constitutional crisis in the Aachen government, and in 1794 Aachen lost its status as a free imperial city . In 1629, the Aachen Jewish community was expelled from the city. In 1667, six Jews were allowed to return. Most of the Aachen Jewish community settled in Burtscheid. As recently as

3335-586: The migration period . The last Roman coin finds are from the time of Emperor Gratian (AD 375–383). Rome withdrew its troops from the area, but the town remained populated. By 470, the town came to be ruled by the Ripuarian Franks and subordinated to their capital, Cologne . During the Roman period, Aachen was the site of a flourishing Jewish community. Pepin the Short had a castle residence built in

3450-567: The vicus Aquae Granni was Frankized around the 5th century. This was followed by a period of sedentism under first Merovingian and then Carolingian rule. With the completion of the Carolingian Palace of Aachen at the transition to the 9th century, Aachen was constituted as the main royal residence of the Frankish Empire ruled by Charlemagne . Because of that the city is sometimes called "cradle of Europe". After

3565-788: The " chef-lieu du département de la Roer " in Napoleon's First French Empire . In 1815, after the Napoleonic Wars , the Kingdom of Prussia took over within the new German Confederation . The city was one of its most socially and politically backward centres until the end of the 19th century. Administered within the Rhine Province , by 1880 the population was 80,000. Starting in 1838, the railway from Cologne to Belgium passed through Aachen. The city suffered extreme overcrowding and deplorable sanitary conditions until 1875, when

Lousberg - Misplaced Pages Continue

3680-565: The 11-hectare park into today's Müsch Park . At the end of the 19th century, according to the plans of Aachen's director of gardens Heinrich Grube, the park areas of the Lousberg were extended eastwards to include the areas of the Salvatorberg, so that a network of green spaces could be created with the city fortifications (northern parts of the ring of avenues) planned by Maximilian Friedrich Weyhe from 1807 and with today's municipal gardens designed by Peter Joseph Lenné in 1852. In 1906,

3795-527: The Canadian city of Regina, Saskatchewan which is located at a similar latitude but at the heart of the North American landmass, far away from the sea's moderating effects, is classified as being in zone 3a. In the 1991–2020 period, the last freeze (at 2 m above ground) of spring occcured on April 28th and the first fall freeze on October 13th, on average. The Aachen weather station has recorded

3910-600: The Celtic god, and it seems it was the Roman 6th Legion at the start of the 1st century AD that first channelled the hot springs into a spa at Büchel, adding at the end of the same century the Münstertherme spa, two water pipelines, and a probable sanctuary dedicated to Grannus. A kind of forum, surrounded by colonnades, connected the two spa complexes. There was an extensive residential area. The Romans built bathhouses near Burtscheid . A temple precinct called Vernenum

4025-466: The Earth's surface. In 1978, geologist David Varnes noted this imprecise usage and proposed a new, much tighter scheme for the classification of mass movements and subsidence processes. This scheme was later modified by Cruden and Varnes in 1996, and refined by Hutchinson (1988), Hungr et al. (2001), and finally by Hungr, Leroueil and Picarelli (2014). The classification resulting from the latest update

4140-454: The Eifel. Because the city is surrounded by hills, it suffers from inversion-related smog. Some areas of the city have become urban heat islands as a result of poor heat exchange, both because of the area's natural geography and from human activity. The city's numerous cold air corridors, which are slated to remain as free as possible from new construction, therefore play an important role in

4255-696: The Lousberg flint makes it a suitable object for studying the distribution of axe blades. The C dates of the artifacts found in the Lousberg overburden indicate that the mine was in operation between 3500 and 3000 B.C. Calculations based on the volume of the overburden, the weight of the production waste, and the average weight of the axe blades suggest that about 300 000 axe blanks left the Lousberg. These axe blanks were distributed as far as Belgium (Thieusies, about 160 km by air), central Hesse ( Büdingen , about 225 km by air), and eastern Westphalia (Neuenknick near Minden , about 280 km by air). The Stone Age mining of flint has almost completely reclaimed

4370-586: The Netherlands lies nearby at about 6 km (4 mi) from Aachen's city centre, while the Dutch city of Heerlen and Eupen , the capital of the German-speaking Community of Belgium , are both located about 20 km (12 mi) from Aachen city centre. Aachen lies near the head of the open valley of the Wurm (which today flows through the city in canalised form), part of the larger basin of

4485-560: The Netherlands. The highest point in Aachen, located in the far southeast of the city, lies at an elevation of 410 m (1,350 ft) above sea level. The lowest point, in the north, and on the border with the Netherlands, is at 125 m (410 ft). As the westernmost city in Germany (and close to the Low Countries), Aachen and the surrounding area belongs to a temperate climate zone ( Cfb ), with humid weather, mild winters, and warm summers. Because of its location north of

4600-651: The Roman Curia as such. In 936, Otto I was crowned king of East Francia in the collegiate church built by Charlemagne. During the reign of Otto II , the nobles revolted and the West Franks under Lothair raided Aachen in 978. Aachen was attacked again by Odo of Champagne , who attacked the imperial palace while Conrad II was absent. Odo relinquished it and was killed afterwards. The palace and town of Aachen had fortifying walls built by order of Emperor Frederick Barbarossa between 1172 and 1176. Over

4715-631: The area of the Val Pola disaster (Italy). Evidence of past landslides has been detected on many bodies in the solar system, but since most observations are made by probes that only observe for a limited time and most bodies in the solar system appear to be geologically inactive not many landslides are known to have happened in recent times. Both Venus and Mars have been subject to long-term mapping by orbiting satellites, and examples of landslides have been observed on both planets. Landslide mitigation refers to several human-made activities on slopes with

Lousberg - Misplaced Pages Continue

4830-519: The building was renovated and enlarged under the direction of Adam Franz Friedrich Leydel. On 29 August 1836 the Society House burned down completely after a ball. In 1838 it was rebuilt in the neoclassical style according to Leydel's plans and later renovated and expanded according to Friedrich Joseph Ark's plans. Known as the Belvedere , it functioned as both a restaurant and a casino. It was

4945-463: The central plateau of the Lousberg, which originally consisted of a 6 m thick layer of calcareous limestone. The resulting dumps, up to 4.5 meters thick, are still visible today as a hilly landscape under the yew grove. Finished axes and flint flakes have been found in the area and on the steep slopes. During the Roman occupation, the limestone was used to build the thermal baths of Aachen, and in

5060-558: The city bought it and had it rebuilt on the Lousberg. The pavilion has been managed by the Lousberg Society since 2005 and is used for exhibitions and lectures. The open-air stage on the Lousberg, which was built like a Greek theater on the hillside facing the city, failed not least because of the Aachen weather. During World War II , the Belvédère social house and other structures in the park were destroyed. The remains of

5175-462: The city is best known is Aachener Printen , a type of gingerbread . The name Aachen is a modern descendant, like southern German Ach(e) , German: Aach , meaning "river" or "stream", from Old High German ahha , meaning "water" or "stream", which directly translates (and etymologically corresponds) to Latin Aquae , referring to the springs. The location has been inhabited by humans since

5290-535: The city of Aachen rebuilt the Kersten Pavilion, a baroque building designed by the Aachen architect Johann Joseph Couven , on the Lousberg. The pavilion, which is about 100 years older than the Lousberg Park, was previously located in the city of Aachen at Annuntiatenbach 22–28 and was part of the city palace of the wealthy dye -works owner Nicolaus Mantels. To save the building from demolition,

5405-449: The city. On Kristallnacht in 1938, the synagogue was destroyed. By the onset of World War II in 1939, many Jews had emigrated or were arrested, and only 782 remained in the city. At the end of the war in 1945, only 62 Jews lived in the city. As of 2003, 1,434 Jews were again living in Aachen. The city of Aachen has developed into a technology hub as a by-product of hosting one of the leading universities of technology in Germany with

5520-463: The city. The first killed 1,525, including 212 children, and bombed six hospitals. During the second, 442 aircraft hit two railway stations, killed 207, and left 15,000 homeless. The raids destroyed Aachen-Eilendorf and Aachen-Burtscheid . The city and its fortified surroundings were besieged from 12 September to 21 October 1944 by the US 1st Infantry Division with the 3rd Armored Division assisting from

5635-421: The columns of the Belvédère can still be seen today and are colloquially known as the "Aachen Acropolis". The Belvedere Water Tower was built in 1956 to provide water to the western neighborhoods. In the 1980s, however, more efficient pumps made this unnecessary, and in 1988 the tower ceased to function as a water tower altogether. After extensive renovations, it is now used primarily as an office building. For

5750-540: The court library were also produced locally. During the reign of Louis the Pious (814–840), substantial quantities of ancient texts were produced at Aachen, including legal manuscripts such as the leges scriptorium group, patristic texts including the five manuscripts of the Bamberg Pliny Group . Finally, under Lothair I (840–855), texts of outstanding quality were still being produced. This however marked

5865-544: The court of Harun al-Rashid . He returned to Aachen in July 802, bearing an elephant called Abul-Abbas as a gift for the emperor. After Charlemagne's death, he was buried in the church which he had built; his original tomb has been lost, while his alleged remains are preserved in the Karlsschrein , the shrine where he was reburied after being declared a saint; his saintliness, however, was never officially acknowledged by

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5980-579: The development of guidelines for sustainable land-use planning . The analysis is used to identify the factors that are related to landslides, estimate the relative contribution of factors causing slope failures, establish a relation between the factors and landslides, and to predict the landslide hazard in the future based on such a relationship. The factors that have been used for landslide hazard analysis can usually be grouped into geomorphology , geology , land use/land cover, and hydrogeology . Since many factors are considered for landslide hazard mapping, GIS

6095-468: The effects of climate change on landslides need to be studied on a regional scale. Climate change can have both positive and negative impacts on landslides Temperature rise may increase evapotranspiration, leading to a reduction in soil moisture and stimulate vegetation growth, also due to a CO2 increase in the atmosphere. Both effects may reduce landslides in some conditions. On the other side, temperature rise causes an increase of landslides due to Since

6210-622: The end of 2009, the foreign-born residents of Aachen made up 13.6 percent of the total population. A significant portion of foreign residents are students at the RWTH Aachen University . Aachen is at the western end of the Benrath line that divides High German to the south from the rest of the West Germanic speech area to the north. Aachen's local dialect is called Öcher Platt and belongs to Ripuarian . The city

6325-461: The end of the period of manuscript production at Aachen. In 1598, following the invasion of Spanish troops from the Netherlands , Rudolf deposed all Protestant office holders in Aachen and went as far as expelling them from the city. From the early 16th century, Aachen started to lose its power and influence. First the coronations of emperors were moved from Aachen to Frankfurt . This

6440-406: The environment , can increase the frequency of natural events (such as extreme weather ) which trigger landslides. Landslide mitigation describes the policy and practices for reducing the risk of human impacts of landslides, reducing the risk of natural disaster . Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This

6555-452: The fluidization of landslide material as it gains speed or incorporates further debris and water along its path. River blockages as the flow reaches a main stream can generate temporary dams. As the impoundments fail, a domino effect may be created, with a remarkable growth in the volume of the flowing mass, and in its destructive power. An earthflow is the downslope movement of mostly fine-grained material. Earthflows can move at speeds within

6670-702: The following extreme values: The geology of Aachen is very structurally heterogeneous. The oldest occurring rocks in the area surrounding the city originate from the Devonian period and include carboniferous sandstone , greywacke , claystone and limestone . These formations are part of the Rhenish Massif , north of the High Fens. In the Pennsylvanian subperiod of the Carboniferous geological period, these rock layers were narrowed and folded as

6785-459: The footpaths. From an ornithological point of view, the Lousberg is very rich in species, as studies carried out by the RWTH Aachen University have shown. The population of bats, amphibians, and reptiles is also remarkable. The amphibians find spawning waters in the Soers north of the Lousberg. There is a continuous yew forest on the plateau. In the former St. Raphael monastery park to the north,

6900-713: The form of the surface(s) or shear zone(s) on which movement happens. The planes may be broadly parallel to the surface ("planar slides") or spoon-shaped ("rotational slides"). Slides can occur catastrophically, but movement on the surface can also be gradual and progressive. Spreads are a form of subsidence, in which a layer of material cracks, opens up, and expands laterally. Flows are the movement of fluidised material, which can be both dry or rich in water (such as in mud flows). Flows can move imperceptibly for years, or accelerate rapidly and cause disasters. Slope deformations are slow, distributed movements that can affect entire mountain slopes or portions of it. Some landslides are complex in

7015-560: The formation of the Lower Rhine Bight. At the foot of the Lousberg, dark gray, clayey to sandy sediments of the so-called Hergenrath layers were deposited, which formed in a swampy river delta . Silicified wood, charcoal, and numerous concretions of marcasite are embedded in these layers. Due to the water-storing properties of the deposits, the clay of the Hergenrath layers forms the most important spring horizon in

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7130-462: The goal of lessening the effect of landslides. Landslides can be triggered by many, sometimes concomitant causes. In addition to shallow erosion or reduction of shear strength caused by seasonal rainfall , landslides may be triggered by anthropic activities, such as adding excessive weight above the slope, digging at mid-slope or at the foot of the slope. Often, individual phenomena join to generate instability over time, which often does not allow

7245-480: The landscape changed after an event, what may have triggered the landslide, and shows the process of regeneration and recovery. Using satellite imagery in combination with GIS and on-the-ground studies, it is possible to generate maps of likely occurrences of future landslides. Such maps should show the locations of previous events as well as clearly indicate the probable locations of future events. In general, to predict landslides, one must assume that their occurrence

7360-604: The late 18th century the Abbess of Burtscheid was still prevented from building a road linking her territory to the neighbouring estates of the duke of Jülich ; the city of Aachen deployed its handful of soldiers to chase away road-diggers. On 9 February 1801, the Peace of Lunéville removed the ownership of Aachen and the entire "left bank" of the Rhine from Germany (the Holy Roman Empire ) and granted it to France. In 1815, control of

7475-402: The late 8th century and then made the city his empire's capital. The city is known by a variety of different names in other languages: Flint quarries on the Lousberg , Schneeberg, and Königshügel, first used during Neolithic times (3000–2500 BC), attest to the long occupation of the site of Aachen, as do recent finds under the modern city's Elisengarten pointing to a former settlement from

7590-412: The limestone layer on the Lousberg was about 6 meters. The upper 4.5 meters contained layers of brown flint , which were the subject of a Neolithic quarry. All but a small amount of the flint was quarried, and the unused limestone material was dumped on the surrounding slopes. Due to the poor consolidation of this debris, small landslides still occur today, as evidenced by the uprooted trees and cracks in

7705-437: The listed Müschpark, there are extensive stands of wild daffodils . During the Neolithic period , about 5500 to 5000 years ago, flint was mined and worked intensively on the Lousberg. This gray flint, easily recognizable by its characteristic chocolate-brown color zones, was used to make axes and other tools, most of which were polished on-site or brought to settlements as semi-finished products. The striking coloration of

7820-440: The long runout can be different, but they typically result in the weakening of the sliding mass as the speed increases. The causes of this weakening are not completely understood. Especially for the largest landslides, it may involve the very quick heating of the shear zone due to friction, which may even cause the water that is present to vaporize and build up a large pressure, producing a sort of hovercraft effect. In some cases,

7935-527: The medieval fortifications were abandoned as a limit to building and new, better housing was built in the east of the city, where sanitary drainage was easiest. In December 1880, the Aachen tramway network was opened, and in 1895 it was electrified. In the 19th century and up to the 1930s, the city was important in the production of railway locomotives and carriages, iron, pins, needles , buttons, tobacco, woollen goods, and silk goods. After World War I , Aachen

8050-427: The middle of the 17th century, the city had developed a considerable reputation as a spa, although this was in part because Aachen was then – and remained well into the 19th and early 20th century – a place of high-level prostitution. Traces of this hidden agenda of the city's history are found in the 18th-century guidebooks to Aachen as well as to the other spas. The main indication for visiting patients, ironically,

8165-413: The most important factors that trigger landslides in any given location. Using GIS, extremely detailed maps can be generated to show past events and likely future events which have the potential to save lives, property, and money. Since the ‘90s, GIS have been also successfully used in conjunction to decision support systems , to show on a map real-time risk evaluations based on monitoring data gathered in

8280-519: The mountain offers an excellent panoramic view, or it could be traced back to Louis the Pious , the son of Charlemagne . Another explanation has to do with the Aachen dialect term lous , which means "clever". Geologically , the Lousberg is one of Aachen's three inlier mountains, along with the Salvatorberg  [ de ] and the Wingertsberg  [ de ] , and one of

8395-431: The movement of a mass over a planar or curvilinear surface or shear zone. A debris slide is a type of slide characterized by the chaotic movement of material mixed with water and/or ice. It is usually triggered by the saturation of thickly vegetated slopes which results in an incoherent mixture of broken timber, smaller vegetation and other debris. Debris flows and avalanches differ from debris slides because their movement

8510-471: The movement of clayey materials, which facilitate the intrusion of water into the moving mass and produce faster responses to precipitation. A rock avalanche, sometimes referred to as sturzstrom , is a large and fast-moving landslide of the flow type. It is rarer than other types of landslides but it is often very destructive. It exhibits typically a long runout, flowing very far over a low-angle, flat, or even slightly uphill terrain. The mechanisms favoring

8625-451: The negative impacts felt by landslides. GIS offers a superior method for landslide analysis because it allows one to capture, store, manipulate, analyze, and display large amounts of data quickly and effectively. Because so many variables are involved, it is important to be able to overlay the many layers of data to develop a full and accurate portrayal of what is taking place on the Earth's surface. Researchers need to know which variables are

8740-584: The next 500 years, most kings of Germany who ruled the Holy Roman Empire were crowned in Aachen. The original audience hall built by Charlemagne was torn down and replaced by the current city hall in 1330. During the 13th century, many Jews converted to Christianity, as shown in the records of the Aachen Minster (today's Cathedral). In 1486, the Jews of Aachen offered gifts to Maximilian I during his coronation ceremony. The last king to be crowned here

8855-648: The northwest: Herzogenrath , Würselen , Eschweiler , Stolberg and Roetgen (which are all in the district of Aachen ); Raeren , Kelmis and Plombières ( Liège Province in Belgium) as well as Vaals , Gulpen-Wittem , Simpelveld , Heerlen and Kerkrade (all in Limburg Province in the Netherlands). The current mayor of Aachen is Sibylle Keupen , an independent endorsed by Alliance 90/The Greens , since 2020. The most recent mayoral election

8970-584: The obelisk was re-erected by order of the Prussian Baron Karl von Müffling , who continued the surveying work on behalf of the Kingdom of Prussia . The inscription praising Napoleon was replaced by the inscription that can still be read today. The damage to the edges of the stone was compensated by chamfering , which is untypical for an obelisk. It was at this time that the first landscape park in Europe, initiated by citizens (and not by princes),

9085-426: The people of Aachen tricked the devil into building the cathedral. The devil was out for revenge and wanted to bury the cathedral and the city in the sand forever. However, he was tricked by a poor woman and dropped the pile of sand north of the city, creating a larger and smaller mountain. Because the woman was "lous", which means "clever" in the Aachen dialect, the larger mountain was called "Lousberg". The legend

9200-407: The prefecture of the département of Roer. The idea of a park on the Lousberg was combined with the idea of building a society house called the " Belvédère " on the southeastern slope of the mountain. To this end, several citizens, under the chairmanship of Körfgen, joined in a specially created corporation whose purpose was to promote tourism. While the public authorities had to provide the land for

9315-403: The preferred place of coronation. One of Germany's leading institutes of higher education in technology, the RWTH Aachen University ( Rheinisch-Westfälisch Technische Hochschule Aachen ), is located in the city. Its university hospital Uniklinikum Aachen is Europe's largest single-building hospital. Aachen's industries include science, engineering and information technology. In 2009, Aachen

9430-530: The project and carry out the planting work, it was up to the limited company to raise the funds to build the society house. The first plantings on the Lousberg were commissioned in 1807 by Alexandre de Lameth , the prefect of the département of Roer. The plans for the park, based on the principles of the English landscape garden , were drawn up by the court gardener Maximilian Friedrich Weyhe of Düsseldorf, who had also been commissioned by Lameth to submit plans for

9545-399: The redesign of the outer moats. The overall project was overseen by a "Committee for Embellishments," established in 1807. The Lousberg, which had been more or less bare and used as a sheep pasture, was transformed into a wooded park with an extensive tree population by 1818. The society house was built between 1807 and 1810. Its dilapidation was complained about as early as 1818. In 1827–1828

9660-402: The reduction of property damage and loss of life. Because landslides occur frequently and can represent some of the most destructive forces on earth, it is imperative to have a good understanding as to what causes them and how people can either help prevent them from occurring or simply avoid them when they do occur. Sustainable land management and development is also an essential key to reducing

9775-548: The region, both on the Lousberg and in the Aachen Forest . Subsequently, during the Upper Cretaceous, the area was gradually submerged by the sea, and 30–50 m thick quartz sands of the Aachen Formation were deposited, which were mined in small sand pits on the lower slopes of the Lousberg (e.g. at the present playground at the end of Kupferstraße ). There is a clear erosional unconformity between

9890-518: The royal household for several months. In the year of his coronation as king of the Franks , 768, Charlemagne came to spend Christmas at Aachen for the first time. He remained there in a mansion which he may have extended, although there is no source attesting to any significant building activity at Aachen in his time, apart from the building of the Palatine Chapel (since 1930, cathedral) and

10005-607: The same period. Bronze Age (around 1600 BC) settlement is evidenced by the remains of barrows (burial mounds) found, for example, on the Klausberg. During the Iron Age , the area was settled by Celtic peoples who were perhaps drawn by the marshy Aachen basin's hot sulphur springs where they worshipped Grannus , god of light and healing. The 25-hectare Roman spa resort town of Aquae Granni was, according to legend, founded by Grenus, under Hadrian , around 124 AD. Grenus refers to

10120-670: The sands of the Aachen Formation and the younger Vaals Formation of the Campanian . The sands of the Vaals Formation are characterized by an increased occurrence of glauconite . Because of their greenish-brown weathering color, these beds were formerly known as the Vaals Green Sands . In the Campanian, tectonic movements began to increase, which are associated with the sinking of the Lower Rhine Bight and led to

10235-489: The sense that they feature different movement types in different portions of the moving body, or they evolve from one movement type to another over time. For example, a landslide can initiate as a rock fall or topple and then, as the blocks disintegrate upon the impact, transform into a debris slide or flow. An avalanching effect can also be present, in which the moving mass entrains additional material along its path. Slope material that becomes saturated with water may produce

10350-412: The sliding surface is mostly deeply located, for instance well below the maximum rooting depth of trees. They usually involve deep regolith , weathered rock, and/or bedrock and include large slope failures associated with translational, rotational, or complex movements. They tend to form along a plane of weakness such as a fault or bedding plane . They can be visually identified by concave scarps at

10465-472: The south. Around 13 October the US 2nd Armored Division, coming from the north, and got as close as Würselen , while the 30th Infantry Division completed the encirclement of Aachen on 16 October 1944. With reinforcements from the US 28th Infantry Division the battle continued involving direct assaults through the heavily defended city, which forced the German garrison to surrender on 21 October 1944. Aachen

10580-469: The southernmost foothills of the Aachen - Limburg Cretaceous . It was formed during the Upper Cretaceous , when the region around Aachen was affected by a Europe-wide marine transgression , during which initially sandy and later predominantly calcareous sediments were deposited ( Aachen Formation ). The morphological elevation of the Lousberg is related to the tectonic movements that led to

10695-403: The southwest, and the Netherlands in the northwest. The city lies in the Meuse–Rhine Euroregion and is the seat of the district of Aachen ( Städteregion Aachen ). The once Celtic settlement was equipped with several thermae in the course of colonization by Roman pioneers settling at the warm Aachen thermal springs around the 1st century. After the withdrawal of the Roman troops,

10810-492: The subsurface of Aachen is traversed by numerous active faults that belong to the Rurgraben fault system, which has been responsible for numerous earthquakes in the past, including the 1756 Düren earthquake and the 1992 Roermond earthquake , which was the strongest earthquake ever recorded in the Netherlands . Aachen has 245,885 inhabitants (as of 31 December 2015), of whom 118,272 are female, and 127,613 are male. At

10925-726: The top and steep areas at the toe. Deep-seated landslides also shape landscapes over geological timescales and produce sediment that strongly alters the course of fluvial streams . Landslides that occur undersea, or have impact into water e.g. significant rockfall or volcanic collapse into the sea, can generate tsunamis . Massive landslides can also generate megatsunamis , which are usually hundreds of meters high. In 1958, one such tsunami occurred in Lituya Bay in Alaska. Landslide hazard analysis and mapping can provide useful information for catastrophic loss reduction, and assist in

11040-494: The town was passed to the Kingdom of Prussia through an agreement reached by the Congress of Vienna . The third congress took place in 1818, to decide the fate of occupied Napoleonic France. By the middle of the 19th century, industrialisation had swept away most of the city's medieval rules of production and commerce, although the remains of the city's medieval constitution were kept in place until 1801, when Aachen became

11155-620: The town, due to the proximity of the hot springs and also for strategic reasons as it is located between the Rhineland and northern France. Einhard mentions that in 765–766 Pepin spent both Christmas and Easter at Aquis villa ( Et celebravit natalem Domini in Aquis villa et pascha similiter ) ("and [he] celebrated the birth of the Lord [Christmas] in the town Aquis, and similarly Easter"), which must have been sufficiently equipped to support

11270-413: The underlying bedrock. Failure surfaces can also form within the clay or silt layer itself, and they usually have concave shapes, resulting in rotational slides Slope failure mechanisms often contain large uncertainties and could be significantly affected by heterogeneity of soil properties. A landslide in which the sliding surface is located within the soil mantle or weathered bedrock (typically to

11385-554: The uplift of the Lousberg Floe. The Vijlen and Orsbach  [ de ] limestones were probably not primarily sedimented due to their high altitude. It was not until the Maastrichtian that the Lousberg Floe was submerged again due to a rise in sea level. Dead microorganisms were deposited in a calcareous mud, which today forms the so-called Vetschau  [ de ] limestone . The original thickness of

11500-434: The urban climate of Aachen. The January average is 3.0 °C (37 °F), while the July average is 18.5 °C (65 °F). Precipitation is almost evenly spread throughout the year. The city's oceanic climate provides comparably mild winters: While Aachen falls within the coldest extents covered by USDA plant hardiness zone 8b in the 1991–2020 period, having an average yearly minimum of -9.22 °C (15.4 °F),

11615-474: The very high temperature may even cause some of the minerals to melt. During the movement, the rock in the shear zone may also be finely ground, producing a nanometer-size mineral powder that may act as a lubricant, reducing the resistance to motion and promoting larger speeds and longer runouts. The weakening mechanisms in large rock avalanches are similar to those occurring in seismic faults. Slides can occur in any rock or soil material and are characterized by

11730-464: The views converged at the obelisk. The course itself was also dramatically designed by Weyhe, with flat sections alternating with climbs of varying lengths. Between 1803 and 1814, General Secretary Johann Wilhelm Körfgen had his Müsch estate, located on the northern flank of the Lousberg in the Soers , transformed into a ferme ornée according to Maximilian Friedrich Weyhe's plans for the Lousberg. In 1866, Weyhe's son Joseph Clemens Weyhe developed

11845-417: Was Ferdinand I in 1531. During the Middle Ages , Aachen remained a city of regional importance, due to its proximity to Flanders ; it achieved a modest position in the trade in woollen cloths, favoured by imperial privilege. The city remained a free imperial city , subject to the emperor only, but was politically far too weak to influence the policies of any of its neighbours. The only dominion it had

11960-573: Was syphilis ; only by the end of the 19th century had rheumatism become the most important object of cures at Aachen and Burtscheid. Aachen was chosen as the site of several important congresses and peace treaties: the first congress of Aachen (often referred to as the Congress of Aix-la-Chapelle in English) on 2 May 1668, leading to the First Treaty of Aachen in the same year which ended

12075-584: Was also the site of many important church councils, including the Council of 837 and the Council of 1166 , a council convened by the antipope Paschal III . Aachen was an important site for the production of historical manuscripts. Under Charlemagne's purview, both the Ada Gospels and the Coronation Gospels may have been produced in Aachen. In addition, quantities of the other texts in

12190-463: Was built near the modern Kornelimünster/Walheim . Today, remains have been found of three bathhouses, including two fountains in the Elisenbrunnen and the Burtscheid bathhouse. Roman civil administration in Aachen eventually broke down as the baths and other public buildings (along with most of the villae rusticae of the surrounding countryside) were destroyed around AD 375 at the start of

12305-415: Was created on the Lousberg. These efforts were closely linked to the embellishments ordered by Napoleon in 1804, which included the "repair and embellishment of the baths" and the creation of "walks" on the filled-in trenches of the outer city fortifications. The idea of planting the Lousberg is said to have originated in 1806 and to have been promoted by Johann Wilhelm Körfgen (1769–1829), secretary general of

12420-478: Was followed by the religious wars and the great fire of 1656. After the destruction of most of the city in 1656, the rebuilding was mostly in the Baroque style. The decline of Aachen culminated in 1794, when the French, led by General Charles Dumouriez , occupied Aachen. In 1542, the Dutch humanist and physician Francis Fabricius published his study of the health benefits of the hot springs in Aachen. By

12535-450: Was held on 13 September 2020, with a runoff held on 27 September, and the results were as follows: The Aachen city council governs the city alongside the mayor. The most recent city council election was held on 13 September 2020, and the results were as follows: Landslide Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make

12650-466: Was integrated into the Lousberg Park in 2009. The Lousberg is also the site of the annual summer Lousberg Run and the open-air literature festival "Reading Pleasure on the Lousberg". The Lousberg legend, one of the Aachen legends, explains the existence of the Lousberg as a single mountain in the middle of the Aachen basin in an etiological way. According to the Aachen Cathedral legend,

12765-638: Was largely unscathed. 4,000 inhabitants remained in the city; the rest had followed evacuation orders. Its first Allied-appointed mayor, Franz Oppenhoff , was assassinated by an SS commando unit. On 16 May 1815, the Jewish community of the city offered an homage in its synagogue to the Prussian king, Friedrich Wilhelm III . In 1862, a large synagogue was built, later called the Old Synagogue  [ de ; fr ; id ] . By 1933, 1,345 Jews lived in

12880-750: Was occupied by the Allies until 1930, along with the rest of German territory west of the Rhine. Aachen was one of the locations involved in the Rhenish Republic . On 21 October 1923, an armed mob took over the city hall. Similar actions took place in Mönchengladbach , Duisburg , and Krefeld . This republic lasted about a year. Aachen was heavily damaged during World War II . According to Jörg Friedrich in The Fire (2008), two Allied air raids on 11 April and 24 May 1944 "radically destroyed"

12995-539: Was over Burtscheid , a neighbouring territory ruled by a Benedictine abbess , which was forced to accept that all of its traffic must pass through the "Aachener Reich". As an imperial city, Aachen held certain political privileges that allowed it to remain independent of the troubles of Europe for many years. It remained a direct vassal of the Holy Roman Empire throughout most of the Middle Ages. It

13110-400: Was ranked eighth among cities in Germany for innovation. The regional dialect spoken in the city is a Central Franconian , Ripuarian variant with strong Limburgish influences from the dialects in the neighbouring Netherlands. As a Rhenish city, Aachen is one of the main centres of carnival celebrations in Germany , along with Cologne and Mainz . The culinary specialty for which

13225-580: Was the first German city to be captured by the Western Allies, and its residents welcomed the soldiers as liberators. What remained of the city was destroyed—in some areas completely—during the fighting, mostly by American artillery fire and demolitions carried out by the Waffen-SS defenders. Damaged buildings included medieval churches of and the Rathaus (city hall), although Aachen Cathedral

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