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78-915: Glines Canyon Dam , also known as Upper Elwha Dam , was a 210-foot (64 m) tall concrete arch dam that impounded Lake Mills reservoir on the Elwha River in Clallam County, Washington . As of 2015, it is the tallest dam ever to be intentionally breached. Built in 1927, Glines Canyon Dam was located 13 miles (21 km) upriver from the mouth of the Elwha River at the Strait of Juan de Fuca , and about 8 miles (13 km) upriver from Elwha Dam . Both dams lay within Olympic National Park , established in 1938. The National Park Service demolished Glines Canyon Dam in 2014 as part of

156-592: A 7 acres (2.8 ha) area comprising the dam, the powerhouse, and the water conveying system, was listed on the National Register of Historic Places in 1988. Lacking passage for migrating salmon , Glines Canyon Dam blocked access by anadromous salmonids to the upper 38 miles (61 km) of mainstem habitat and more than 30 miles (48 km) of tributary habitat. The Elwha River watershed once supported salmon runs of more than 400,000 adult returns on more than 70 miles (110 km) of river habitat. By

234-412: A Parisian goldsmith. Although he had a strong Chinese contingent, Möngke relied heavily on Muslim and Mongol administrators and launched a series of economic reforms to make government expenses more predictable. His court limited government spending and prohibited nobles and troops from abusing civilians or issuing edicts without authorization. He commuted the contribution system to a fixed poll tax which

312-520: A bloody purge of Ögedeid and Chagatayid factions, but disputes continued among the descendants of Tolui. The conflict over whether the Mongol Empire would adopt a sedentary, cosmopolitan lifestyle or continue its nomadic, steppe-based way of life was a major factor in the breakup. After Möngke Khan died (1259), rival kurultai councils simultaneously elected different successors, the brothers Ariq Böke and Kublai Khan , who fought each other in

390-512: A new great khan, Batu called a kurultai on his own territory in 1250. As it was far from the Mongol heartland , members of the Ögedeid and Chagataid families refused to attend. The kurultai offered the throne to Batu, but he rejected it, claiming he had no interest in the position. Batu instead nominated Möngke , a grandson of Genghis from his son Tolui's lineage. Möngke was leading a Mongol army in Rus,

468-448: A policy of sharing spoils with his warriors and their families instead of giving them all to the aristocrats. These policies brought him into conflict with his uncles, who were also legitimate heirs to the throne; they regarded Temujin not as a leader but as an insolent usurper. This dissatisfaction spread to his generals and other associates, and some Mongols who had previously been allies broke their allegiance. War ensued, and Temujin and

546-424: Is 6,565 ft (2,001 m) while the multiple-arch section is 4,284 ft (1,306 m) long and its combination with the spillway sections measure 5,145 ft (1,568 m). Each arch in the dam has a clear span of 60 ft (18 m) and each buttress is 24 ft (7.3 m) wide. Arch dam designs would continue to test new limits and designs such as the double- and multiple-curve. Alfred Stucky and

624-907: The Golden Horde khanate in the northwest, the Chagatai Khanate in Central Asia, the Ilkhanate in Iran, and the Yuan dynasty in China, based in modern-day Beijing . In 1304, during the reign of Temür , the three western khanates accepted the suzerainty of the Yuan dynasty. The part of the empire that fell first was the Ilkhanate, which disintegrated in the period of 1335–1353. Next,

702-420: The Golden Horde , refused to come to the kurultai, claiming that he was ill and that the climate was too harsh for him. The resulting stalemate lasted more than four years and further destabilized the unity of the empire. When Genghis Khan's youngest brother Temüge threatened to seize the throne, Güyük came to Karakorum to try to secure his position. Batu eventually agreed to send his brothers and generals to

780-857: The Khitan -led Liao dynasty since the 10th century. In 1125, the Jin dynasty founded by the Jurchens overthrew the Liao dynasty and attempted to gain control over former Liao territory in Mongolia. In the 1130s the Jin dynasty rulers, known as the Golden Kings, successfully resisted the Khamag Mongol confederation, ruled at the time by Khabul Khan , great-grandfather of Genghis Khan. The Mongolian plateau

858-487: The Mediterranean , in an enforced Pax Mongolica , allowing the exchange of trade, technologies, commodities, and ideologies across Eurasia . The empire began to split due to wars over succession, as the grandchildren of Genghis Khan disputed whether the royal line should follow from his son and initial heir Ögedei or from one of his other sons, such as Tolui , Chagatai , or Jochi . The Toluids prevailed after

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936-566: The Mongol heartland under the leadership of Temüjin, known by the more famous title of Genghis Khan ( c.  1162 – 1227), whom a council proclaimed as the ruler of all Mongols in 1206. The empire grew rapidly under his rule and that of his descendants, who sent out invading armies in every direction. The vast transcontinental empire connected the East with the West , and the Pacific to

1014-640: The Mongols captured Caizhou , the town to which Wanyan Shouxu had fled. In 1234, three armies commanded by Ögedei's sons Kochu and Koten and the Tangut general Chagan invaded southern China. With the assistance of the Song dynasty the Mongols finished off the Jin in 1234. Many Han Chinese and Khitan defected to the Mongols to fight against the Jin. Two Han Chinese leaders, Shi Tianze , Liu Heima (劉黑馬, Liu Ni), and

1092-701: The Qing dynasty in the 1630s. The Golden Horde had broken into competing khanates by the end of the 15th century and its rule on Eastern Europe is traditionally considered to have ended in 1480 with the Great Stand on the Ugra River by the Grand Duchy of Moscow , while the Chagatai Khanate lasted in one form or another until 1687. The Mongol Empire is also referred to as the "Mongolian Empire" or

1170-620: The Romans in the 1st century BC and after several designs and techniques were developed, relative uniformity was achieved in the 20th century. The first known arch dam, the Glanum Dam , also known as the Vallon de Baume Dam, was built by the Romans in France and it dates back to the 1st century BC. The dam was about 12 metres (39 ft) high and 18 metres (59 ft) in length. Its radius

1248-536: The Toluid Civil War (1260–1264) and also dealt with challenges from the descendants of other sons of Genghis. Kublai successfully took power, but war ensued as he sought unsuccessfully to regain control of the Chagatayid and Ögedeid families. By the time of Kublai's death in 1294, the Mongol Empire had fractured into four separate khanates or empires , each pursuing its own interests and objectives:

1326-569: The restoration of the Elwha River (Elwha Dam was demolished in 2011–2012). The project was the largest dam removal in history until the restoration of the lower Klamath River in the 2020s. The dam was built privately to generate electricity for industries and major military installations on the Olympic Peninsula, including lumber and paper mills in Port Angeles. The Glines Canyon Hydroelectric Power Plant historic district ,

1404-517: The "Mongol World Empire" in some English sources. The empire referred to itself as ᠶᠡᠬᠡ ᠮᠣᠩᠭᠣᠯ ᠤᠯᠤᠰ yeke mongɣol ulus ( lit. 'nation of the great Mongols' or the 'great Mongol nation') in Mongol or kür uluγ ulus ( lit. the 'whole great nation') in Turkic. After the 1260 to 1264 succession war between Kublai Khan and his brother Ariq Böke , Kublai's power became limited to

1482-793: The Asian invaders except for a few northern cities. Mongol troops under Chormaqan in Persia connecting his invasion of Transcaucasia with the invasion of Batu and Subutai, forced the Georgian and Armenian nobles to surrender as well. Giovanni de Plano Carpini , the pope's envoy to the Mongol great khan, travelled through Kiev in February 1246 and wrote: They [the Mongols] attacked Russia, where they made great havoc, destroying cities and fortresses and slaughtering men; and they laid siege to Kiev,

1560-570: The Khitan Xiao Zhala defected and commanded the 3 Tumens in the Mongol army. Liu Heima and Shi Tianze served Ogödei Khan. Liu Heima and Shi Tianxiang led armies against Western Xia for the Mongols. There were four Han Tumens and three Khitan Tumens, with each Tumen consisting of 10,000 troops. The Yuan dynasty created a Han army 漢軍 from Jin defectors, and another of ex-Song troops called the Newly Submitted Army 新附軍. In

1638-660: The Kipchak-controlled steppes. In the east, Ögedei's armies re-established Mongol authority in Manchuria, crushing the Eastern Xia regime and the Water Tatars . In 1230, the great Khan personally led his army in the campaign against the Jin dynasty of China. Ögedei's general Subutai captured the capital of Emperor Wanyan Shouxu in the siege of Kaifeng in 1232. The Jin dynasty collapsed in 1234 when

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1716-743: The Koreans through both diplomacy and military force. The advance into Europe continued with Mongol invasions of Poland and Hungary. When the western flank of the Mongols plundered Polish cities, a European alliance among the Poles , the Moravians , and the Christian military orders of the Hospitallers , Teutonic Knights and the Templars assembled sufficient forces to halt, although briefly,

1794-779: The Mongol Empire at its height stretched from the Sea of Japan to parts of Eastern Europe , extending northward into parts of the Arctic ; eastward and southward into parts of the Indian subcontinent , mounted invasions of Southeast Asia , and conquered the Iranian Plateau ; and reached westward as far as the Levant and the Carpathian Mountains . The Mongol Empire emerged from the unification of several nomadic tribes in

1872-515: The Mongol Empire. This marked a major shift in the leadership of the empire, transferring power from the descendants of Genghis's son Ögedei to the descendants of Genghis's son Tolui. The decision was acknowledged by a few of the Ögedeid and Chagataid princes, such as Möngke's cousin Kadan and the deposed khan Qara Hülëgü, but one of the other legitimate heirs, Ögedei's grandson Shiremun, sought to topple Möngke. Shiremun moved with his own forces toward

1950-599: The Mongol advance at Legnica . The Hungarian army, their Croatian allies and the Knights Templar were beaten by the Mongols at the banks of the Sajo River on 11 April 1241. Before Batu's forces could continue on to Vienna and northern Albania , news of Ögedei's death in December 1241 brought a halt to the invasion. As was customary in Mongol military tradition, all princes of Genghis's line had to attend

2028-724: The Mongol aristocracy, constituted the ruling class. Genghis Khan arranged for the Chinese Taoist master Qiu Chuji to visit him in Afghanistan, and also gave his subjects the right to religious freedom, despite his own shamanistic beliefs. Genghis Khan died on 18 August 1227, by which time the Mongol Empire ruled from the Pacific Ocean to the Caspian Sea , an empire twice the size of the Roman Empire or

2106-584: The Mongol generals in Persia. Güyük appointed his best friend's father Eljigidei as chief commander of the troops in Persia and gave them the task of both reducing the strongholds of the Nizari Ismailis and conquering the Abbasids at the center of the Islamic world, Iran and Iraq . In 1248, Güyük raised more troops and suddenly marched westward from the Mongol capital of Karakorum. The reasoning

2184-545: The Mongols and helped them conquer the rest of Yunnan . Möngke's general Qoridai stabilized his control over Tibet, inducing leading monasteries to submit to Mongol rule. Subutai's son Uryankhadai reduced the neighboring peoples of Yunnan to submission and went to war with the kingdom of Đại Việt under the Trần dynasty in northern Vietnam in 1258, but they had to draw back. The Mongol Empire tried to invade Đại Việt again in 1285 and 1287 but were defeated both times. After stabilizing

2262-480: The Mongols established Karakorum as their capital lasting until 1260. During that period, Ogedei Khan ordered the construction of a palace within the surrounding of its walls. Meanwhile, in an offensive action against the Song dynasty , Mongol armies captured Siyang-yang, the Yangtze and Sichuan , but did not secure their control over the conquered areas. The Song generals were able to recapture Siyang-yang from

2340-412: The Mongols in 1161. During the rise of the Mongol Empire in the 13th century, the usually cold, parched steppes of Central Asia enjoyed their mildest, wettest conditions in more than a millennium. It is thought that this resulted in a rapid increase in the number of war horses and other livestock, which significantly enhanced Mongol military strength. Known during his childhood as Temüjin, Genghis Khan

2418-644: The Mongols in 1239. After the sudden death of Ögedei's son Kochu in Chinese territory the Mongols withdrew from southern China, although Kochu's brother Prince Koten invaded Tibet immediately after their withdrawal. Batu Khan , another grandson of Genghis Khan, overran the territories of the Bulgars , the Alans , the Kypchaks, Bashkirs, Mordvins , Chuvash , and other nations of the southern Russian steppe. By 1237

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2496-657: The Mongols were encroaching upon Ryazan , the first Kievan Rus' principality they were to attack. After a three-day siege involving fierce fighting, the Mongols captured the city and massacred its inhabitants. They then proceeded to destroy the army of the Grand Principality of Vladimir at the Battle of the Sit River . The Mongols captured the Alania capital Maghas in 1238. By 1240, all Kievan Rus' had fallen to

2574-535: The Mongols' decision to withdraw. Following the Great Khan Ögedei's death in 1241, and before the next kurultai, Ögedei's widow Töregene took over the empire. She persecuted her husband's Khitan and Muslim officials and gave high positions to her own allies. She built palaces, cathedrals, and social structures on an imperial scale, supporting religion and education. She was able to win over most Mongol aristocrats to support Ögedei's son Güyük . But Batu, ruler of

2652-540: The Muslim Caliphate at their height. Genghis named his third son, the charismatic Ögedei , as his heir. According to Mongol tradition, Genghis Khan was buried in a secret location . The regency was originally held by Ögedei's younger brother Tolui until Ögedei's formal election at the kurultai in 1229. Among his first actions Ögedei sent troops to subjugate the Bashkirs , Bulgars , and other nations in

2730-689: The Salmon Creek Dam allowed for larger and taller dam designs. The dam was, therefore, revolutionary, and similar designs were soon adopted around the world, in particular by the U.S. Bureau of Reclamation . In 1920, the Swiss engineer and dam designer Alfred Stucky developed new calculation methods for arch dams, introducing the concept of elasticity during the construction of the Montsalvens arch dam in Switzerland, thereby improving

2808-406: The U.S. Bureau of Reclamation developed a method of weight and stress distribution in the 1960s, and arch dam construction in the United States would see its last surge then with dams like the 143-meter double-curved Morrow Point Dam in Colorado, completed in 1968. By the late 20th century, arch dam design reached a relative uniformity in design around the world. Currently, the tallest arch dam in

2886-428: The United States. Its NRHP application states that this was because three dams of this type failed: (1) Gem Lake Dam, St. Francis Dam (California), Lake Hodges Dam (California). None of these failures were inherently caused by the multiple arch design. The design of an arch dam is a very complex process. It starts with an initial dam layout, that is continually improved until the design objectives are achieved within

2964-545: The West Ögedei's general Chormaqan destroyed Jalal ad-Din Mingburnu , the last shah of the Khwarizmian Empire . The small kingdoms in southern Persia voluntarily accepted Mongol supremacy. In East Asia, there were a number of Mongol campaigns into Goryeo Korea , but Ögedei's attempt to annex the Korean Peninsula met with little success. Gojong , the king of Goryeo , surrendered but later revolted and massacred Mongol darughachis (overseers); he then moved his imperial court from Gaeseong to Ganghwa Island . In 1235,

3042-412: The Yuan dynasty lost control of the Tibetan Plateau and China proper in 1354 and 1368, respectively, and collapsed after its capital of Dadu was taken over by Ming forces . The Genghisid rulers of the Yuan then retreated north and continued to rule the Mongolian Plateau . The regime is thereafter known as the Northern Yuan dynasty in historiography, surviving as a rump state until the conquest by

3120-416: The building of foreign merchants' quarters, Buddhist monasteries , mosques , and Christian churches in the Mongol capital. As construction projects continued, Karakorum was adorned with Chinese, European, and Persian architecture . One famous example was a large silver tree with cleverly designed pipes that dispensed various drinks. The tree, topped by a triumphant angel, was crafted by Guillaume Boucher ,

3198-414: The capital of Russia; after they had besieged the city for a long time, they took it and put the inhabitants to death. When we were journeying through that land we came across countless skulls and bones of dead men lying about on the ground. Kiev had been a very large and thickly populated town, but now it has been reduced almost to nothing, for there are at the present time scarce two hundred houses there and

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3276-407: The control of Genghis Khan. His most powerful allies were his father's friend, Khereid chieftain Toghrul , and Temujin's childhood anda (i.e. blood brother ) Jamukha of the Jadran clan. With their help, Temujin defeated the Merkit tribe, rescued his wife Börte , and went on to defeat the Naimans and the Tatars. Temujin forbade the looting of his enemies without permission, and he implemented

3354-414: The crest. A dam that is double-curved in both its horizontal and vertical planes may be called a dome dam . Arch dams with more than one contiguous arch or plane are described as multiple-arch dams . Early examples include the Roman Esparragalejo Dam with later examples such as the Daniel-Johnson Dam (1968) and Itaipu Dam (1982). However, as a result of the failure of the Gleno Dam shortly after it

3432-400: The dam profile in the vertical direction by using a parabolic arch shape instead of a circular arch shape. Pensacola Dam , completed in the state of Oklahoma in 1940, was considered the longest multiple arch dam in the United States. Designed by W. R. Holway , it has 51 arches. and a maximum height of 150 ft (46 m) above the river bed. The total length of the dam and its sections

3510-586: The design criteria. The main loads for which an arch dam is designed are: Other miscellaneous loads that affect a dam include: ice and silt loads, and uplift pressure. Most often, the arch dam is made of concrete and placed in a V-shaped valley. The foundation or abutments for an arch dam must be very stable and proportionate to the concrete. There are two basic designs for an arch dam: constant-radius dams , which have constant radius of curvature, and variable-radius dams , which have both upstream and downstream curves that systematically decrease in radius below

3588-530: The early 21st-century, fewer than 4,000 adult salmon returned each year. Numerous groups lobbied Congress to remove the two dams on the river and restore the habitat of the river and its valley. The Elwha River Ecosystem and Fisheries Restoration Act of 1992 authorized the US Federal Government to acquire the Elwha Dam and Glines Canyon Dam hydroelectric power projects for decommissioning and demolition for habitat restoration . The Elwha Ecosystem Restoration project started in September 2011 as work to demolish

3666-465: The eastern part of the empire, centered on China. Kublai officially issued an imperial edict on 18 December 1271 to give the empire the Han -style dynastic name of "Great Yuan" ( Dai Yuan , or Dai Ön Ulus' ; Chinese : 大 元 ; pinyin : Dà Yuán ) and to establish the Yuan dynasty . Some sources give the full Mongol name as Dai Ön Yehe Monggul Ulus . The area around Mongolia , Manchuria , and parts of North China had been controlled by

3744-428: The emperor's nomadic palace with a plan for an armed attack, but Möngke was alerted by his falconer of the plan. Möngke ordered an investigation of the plot, which led to a series of major trials all across the empire. Many members of the Mongol elite were found guilty and put to death, with estimates ranging from 77 to 300, though princes of Genghis's royal line were often exiled rather than executed. Möngke confiscated

3822-613: The empire's finances, Möngke once again sought to expand its borders. At kurultais in Karakorum in 1253 and 1258 he approved new invasions of the Middle East and south China . Möngke put Hulagu in overall charge of military and civil affairs in Persia, and appointed Chagataids and Jochids to join Hulagu's army. The Muslims from Qazvin denounced the menace of the Nizari Ismailis , a well-known sect of Shiites . The Mongol Naiman commander Kitbuqa began to assault several Ismaili fortresses in 1253, before Hulagu advanced in 1256. Ismaili Grand Master Rukn al-Din Khurshah surrendered in 1257 and

3900-402: The empire. In addition to laws regarding family, food, and the army, Genghis also decreed religious freedom and supported domestic and international trade. He exempted the poor and the clergy from taxation. He also encouraged literacy and the adaptation of the Uyghur script into what would become the Mongolian script of the empire, ordering the Uyghur Tata-tonga , who had previously served

3978-463: The estates of the Ögedeid and the Chagatai families and shared the western part of the empire with his ally Batu Khan. After the bloody purge, Möngke ordered a general amnesty for prisoners and captives, but thereafter the power of the great khan's throne remained firmly with the descendants of Tolui. Möngke was a serious man who followed the laws of his ancestors and avoided alcoholism. He was tolerant of outside religions and artistic styles, leading to

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4056-435: The forces still loyal to him prevailed, defeating the remaining rival tribes between 1203 and 1205 and bringing them under his sway. In 1206, Temujin was crowned as the khagan (Emperor) of the Yekhe Mongol Ulus (Great Mongol State) at a Kurultai (general assembly/council). It was there that he assumed the title of Genghis Khan (universal leader) instead of one of the old tribal titles such as Gur Khan or Tayang Khan, marking

4134-412: The inhabitants are kept in complete slavery. Despite the military successes, strife continued within the Mongol ranks. Batu's relations with Güyük , Ögedei's eldest son, and Büri , the beloved grandson of Chagatai Khan , remained tense and worsened during Batu's victory banquet in southern Kievan Rus'. Nevertheless, Güyük and Buri could not do anything to harm Batu's position as long as his uncle Ögedei

4212-427: The khan of Naimans , to instruct his sons. Genghis quickly came into conflict with the Jin dynasty of the Jurchens and the Western Xia of the Tanguts in northern China. He also had to deal with two other powers, Tibet and Qara Khitai . Before his death, Genghis Khan divided his empire among his sons and immediate family, making the Mongol Empire the joint property of the entire imperial family who, along with

4290-529: The kurultai convened by Töregene in 1246. Güyük by this time was ill and alcoholic, but his campaigns in Manchuria and Europe gave him the kind of stature necessary for a great khan. He was duly elected at a ceremony attended by Mongols and foreign dignitaries from both within and without the empire — leaders of vassal nations, representatives from Rome, and other entities who came to the kurultai to show their respects and conduct diplomacy. Güyük took steps to reduce corruption, announcing that he would continue

4368-403: The kurultai to elect a successor. Batu and his western Mongol army withdrew from Central Europe the next year. Today researchers doubt that Ögedei's death was the sole reason for the Mongols withdrawal. Batu did not return to Mongolia, so a new khan was not elected until 1246. Climatic and environmental factors, as well as the strong fortifications and castles of Europe, played an important role in

4446-448: The mountains sides. In the early 20th century, the world's first variable-radius arch dam was built on the Salmon Creek near Juneau , Alaska . The Salmon Creek Dam's upstream face bulged upstream, which relieved pressure on the stronger, curved lower arches near the abutments. The dam also had a larger toe, which off-set pressure on the upstream heel of the dam, which now curved more downstream. The technology and economical benefits of

4524-550: The nearby Elwha Dam began downstream. The final piece of the Glines Canyon Dam was removed August 26, 2014. Now that the dam has been removed, the area that was under Lake Mills is being revegetated and its banks secured to prevent erosion and to speed up ecological restoration. Arch dam In general, arch dams are classified based on the ratio of the base thickness to the structural height (b/h) as: Arch dams classified with respect to their structural height are: The development of arch dams throughout history began with

4602-431: The northern Caucasus and Hungary. The pro-Tolui faction supported Batu's choice, and Möngke was elected; though given the kurultai's limited attendance and location, it was of questionable validity. Batu sent Möngke, under the protection of his brothers, Berke and Tukhtemur, and his son Sartaq to assemble a more formal kurultai at Kodoe Aral in the heartland. The supporters of Möngke repeatedly invited Oghul Qaimish and

4680-432: The other major Ögedeid and Chagataid princes to attend the kurultai, but they refused each time. The Ögedeid and Chagataid princes refused to accept a descendant of Genghis's son Tolui as leader, demanding that only descendants of Genghis's son Ögedei could be great khan. When Möngke's mother Sorghaghtani and their cousin Berke organized a second kurultai on 1 July 1251, the assembled throng proclaimed Möngke great khan of

4758-569: The policies of his father Ögedei, not those of Töregene. He punished Töregene's supporters, except for governor Arghun the Elder . He also replaced young Qara Hülëgü , the khan of the Chagatai Khanate , with his favorite cousin Yesü Möngke , to assert his newly conferred powers. He restored his father's officials to their former positions and was surrounded by Uyghur, Naiman and Central Asian officials, favoring Han Chinese commanders who had helped his father conquer Northern China. He continued military operations in Korea, advanced into Song China in

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4836-466: The south, and into Iraq in the west, and ordered an empire-wide census. Güyük also divided the Sultanate of Rum between Izz-ad-Din Kaykawus and Rukn ad-Din Kilij Arslan , though Kaykawus disagreed with this decision. Not all parts of the empire respected Güyük's election. The Hashshashins , former Mongol allies whose Grand Master Hasan Jalalud-Din had offered his submission to Genghis Khan in 1221, angered Güyük by refusing to submit. Instead he murdered

4914-405: The southern part of the empire he continued his predecessors' struggle against the Song dynasty. In order to outflank the Song from three directions, Möngke dispatched Mongol armies under his brother Kublai to Yunnan , and under his uncle Iyeku to subdue Korea and pressure the Song from that direction as well. Kublai conquered the Dali Kingdom in 1253 after the Dali King Duan Xingzhi defected to

4992-556: The start of the Mongol Empire. Genghis Khan introduced many innovative ways of organizing his army: for example dividing it into decimal subsections of arbans (10 soldiers), zuuns (100), Mingghans (1000), and tumens (10,000). The Kheshig , the imperial guard , was founded and divided into day ( khorchin torghuds ) and night ( khevtuul ) guards. Genghis rewarded those who had been loyal to him and placed them in high positions, as heads of army units and households, even though many of them came from very low-ranking clans. Compared to

5070-469: The time, possibly to pay homage, or perhaps with other plans in mind. Before the forces of Batu and Güyük met, Güyük, sick and worn out by travel, died en route at Qum-Senggir (Hong-siang-yi-eulh) in Xinjiang , possibly a victim of poison. Güyük's widow Oghul Qaimish stepped forward to take control of the empire, but she lacked the skills of her mother-in-law Töregene, and her young sons Khoja and Naku and other princes challenged her authority. To decide on

5148-501: The units he gave to his loyal companions, those assigned to his own family members were relatively few. He proclaimed a new code of law of the empire, Ikh Zasag or Yassa ; later he expanded it to cover much of the everyday life and political affairs of the nomads. He forbade the selling of women, theft, fighting among the Mongols, and the hunting of animals during the breeding season. He appointed his stepbrother Shikhikhutug as supreme judge (jarughachi), ordering him to keep records of

5226-420: The world is the 305 metres (1,001 ft) Jingpin-I Dam in China , which was completed in 2013. The longest multiple arch with buttress dam in the world is the Daniel-Johnson Dam in Quebec , Canada . It is 214 meters (702 ft) high and 1,314 meters (4,311 ft) long across its crest. It was completed in 1968 and put in service in 1970. Pensacola Dam was one of the last multiple arch types built in

5304-482: Was a son of a Mongol chieftain and rose very rapidly as a young man by working with Toghrul Khan of the Kerait. After Temujin went to war against Kurtait (also known as Wang Khan; given the Chinese title "Wang" for its meaning of King ), who was the most powerful Mongol leader at the time, he gave himself the name Genghis Khan. He then enlarged his Mongol state under himself and his kin, with the term Mongol coming to be used in reference to all Mongolic speaking tribes under

5382-519: Was about 14 m (46 ft), and it consisted of two masonry walls. The Romans built it to supply nearby Glanum with water. The Monte Novo Dam in Portugal was another early arch dam built by the Romans in 300 AD. It was 5.7 metres (19 ft) high and 52 m long (171 ft), with a radius of 19 m (62 ft). The curved ends of the dam met with two winged walls that were later supported by two buttresses. The dam also contained two water outlets to drive mills downstream. The Dara Dam

5460-402: Was another arch dam built by the Romans in which the historian Procopius would write of its design: "This barrier was not built in a straight line, but was bent into the shape of a crescent, so that the curve, by lying against the current of the river, might be able to offer still more resistance to the force of the stream." The Mongols also built arch dams in modern-day Iran. Their earliest

5538-467: Was betrayed by the Tatars, handed over to the Jurchen, and executed. The Mongols retaliated by raiding the frontier, resulting in a failed Jurchen counter-attack in 1143. In 1147, the Jin somewhat changed their policy, signing a peace treaty with the Mongols and withdrawing from a score of forts. The Mongols then resumed attacks on the Tatars to avenge the death of their late khan, opening a long period of active hostilities. The Jin and Tatar armies defeated

5616-557: Was collected by imperial agents and forwarded to units in need. His court also tried to lighten the tax burden on commoners by reducing tax rates. He also centralized control of monetary affairs and reinforced the guards at the postal relays. Möngke ordered an empire-wide census in 1252 that took several years to complete and was not finished until Novgorod in the far northwest was counted in 1258. In another move to consolidate his power, Möngke assigned his brothers Hulagu and Kublai to rule Persia and Mongol-held China respectively. In

5694-471: Was constructed in 1923, the construction of new multiple arch dams has become less popular. Contraction joints are normally placed every 20 m in the arch dam and are later filled with grout after the control cools and cures. Mongol Empire The Mongol Empire of the 13th and 14th centuries was the largest contiguous empire in history . Originating in present-day Mongolia in East Asia ,

5772-473: Was occupied mainly by five powerful tribal confederations ( khanlig ): Keraites , Khamag Mongol , Naiman , Mergid , and Tatar . The Jin emperors, following a policy of divide and rule , encouraged disputes among the tribes, especially between the Tatars and the Mongols, in order to keep the nomadic tribes distracted by their own battles and thereby away from the Jin. Khabul's successor was Ambaghai Khan , who

5850-602: Was of masonry design and built in a very narrow canyon. The canyon was so narrow that its crest length is only 44% of its height. The dam is still erect, even though part of its lower downstream face fell off. The Tibi Dam in Tibi , Spain was a post-medieval arch dam built between 1579 and 1594 and the first in Europe since the Romans. The dam was 42.7 metres (140 ft) high and 65 metres (213 ft) long. This arch dam rests on

5928-643: Was still alive. Ögedei continued with offensives into the Indian subcontinent , temporarily investing Uchch , Lahore , and Multan of the Delhi Sultanate and stationing a Mongol overseer in Kashmir , though the invasions into India eventually failed and were forced to retreat. In northeastern Asia, Ögedei agreed to end the conflict with Goryeo by making it a client state and sent Mongol princesses to wed Goryeo princes. He then reinforced his kheshig with

6006-520: Was the Kebar Dam built around 1300, which was 26 m (85 ft) high and 55 m (180 ft) long, and had a radius of 35 m (115 ft). Their second dam was built around 1350 and is called the Kurit Dam . After 4 m (13 ft) was added to the dam in 1850, it became 64 m (210 ft) tall and remained the tallest dam in the world until the early 20th century. The Kurit Dam

6084-645: Was unclear. Some sources wrote that he sought to recuperate at his personal estate, Emyl; others suggested that he might have been moving to join Eljigidei to conduct a full-scale conquest of the Middle East, or possibly to make a surprise attack on his rival cousin Batu Khan in Rus. Suspicious of Güyük's motives, Sorghaghtani Beki , the widow of Genghis's son Tolui, secretly warned her nephew Batu of Güyük's approach. Batu had himself been traveling eastward at

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