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102-802: The Mohawk River route was very important for more than a century. The only other waterway crossing the Appalachians lies far to the north in Canada. This was the St. Lawrence River , which flows northeast out of Lake Ontario to Montreal , Quebec City , and the Atlantic. Philip Lord, Jr., for many years a researcher at the New York State Museum , has published extensively on the Albany-Oswego waterway and on its Wood Creek section. Thither

204-615: A decade, daily service was available in the hotly-contested Montreal-Quebec route. Because of the virtually impassable Lachine Rapids , the St. Lawrence was once continuously navigable only as far as Montreal. Opened in 1825, the Lachine Canal was the first to allow ships to pass the rapids. An extensive system of canals and locks, known as the St. Lawrence Seaway , was officially opened on 26 June 1959 by Elizabeth II (representing Canada) and President Dwight D. Eisenhower (representing

306-704: A direct linkage between American wilderness engineering and English waterway history. ...its use in Wood Creek in 1803 is the first application of this ancient English erosion control technology in the United States." The Oneida Carry was replaced by the Rome Canal in 1797. The program of improvements to the Albany-Oswego waterway by the Western Inland Lock Navigation Company had been completed by 1803, which permitted

408-570: A fascination and a keen interest for laymen and, subjects of endless studies for scientists from Quebec, Canada and around the world. Thirteen species of cetaceans frequent the waters of the estuary and the Gulf of St. Lawrence : Flowing through and adjacent to numerous Indigenous homelands, the river was a primary thoroughfare for many peoples. Beginning in Dawnland at the Gulf of St. Lawrence,

510-452: A maximum at the apex to zero at a crossing point (straight line), also called an inflection, because the curvature changes direction in that vicinity. The radius of the loop is the straight line perpendicular to the down-valley axis intersecting the sinuous axis at the apex. As the loop is not ideal, additional information is needed to characterize it. The orientation angle is the angle between sinuous axis and down-valley axis at any point on

612-405: A meander because helicoidal flow of water keeps the bank washed clean of loose sand, silt, and sediment and subjects it to constant erosion. As a result, the meander erodes and migrates in the direction of the outside bend, forming the cut bank. As the cut bank is undermined by erosion, it commonly collapses as slumps into the river channel. The slumped sediment, having been broken up by slumping,

714-411: A meander is part of an entrenched river or part of a freely meandering river within a floodplain, the term slip-off slope can refer to two different fluvial landforms that comprise the inner, convex, bank of a meander loop. In case of a freely meandering river on a floodplain, a slip-off slope is the inside, gently sloping bank of a meander on which sediments episodically accumulate to form a point bar as

816-431: A meandering watercourse is termed meander geometry or meander planform geometry. It is characterized as an irregular waveform . Ideal waveforms, such as a sine wave , are one line thick, but in the case of a stream the width must be taken into consideration. The bankfull width is the distance across the bed at an average cross-section at the full-stream level, typically estimated by the line of lowest vegetation. As

918-428: A river meanders. This type of slip-off slope is located opposite the cutbank. This term can also be applied to the inside, sloping bank of a meandering tidal channel. In case of an entrenched river, a slip-off slope is a gently sloping bedrock surface that rises from the inside, concave bank of an asymmetrically entrenched river. This type of slip-off slope is often covered by a thin, discontinuous layer of alluvium. It

1020-456: A river that flows into the sea). The river's present name has been used since 1604 when it was recorded on a map by Samuel de Champlain Champlain opted for the names Grande riviere de sainct Laurens and Fleuve sainct Laurens in his writings, supplanting the earlier names. In contemporary French, the name is rendered as the fleuve Saint-Laurent . The name Saint-Laurent (Saint Lawrence)

1122-413: A self-intensifying process...in which greater curvature results in more erosion of the bank, which results in greater curvature..." The cross-current along the floor of the channel is part of the secondary flow and sweeps dense eroded material towards the inside of the bend. The cross-current then rises to the surface near the inside and flows towards the outside, forming the helical flow . The greater

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1224-747: A short canal was built to bypass a notorious "hook" in the Mohawk River. It is one of the first canals built in North America. Wood Creek and the Oneida Carry were of sufficient strategic importance that the British built three fortifications there in 1755 during the war with France (the French and Indian War (1754–1763)). Fort Bull on Wood Creek was the furthest west, and was the scene of the 1756 Battle of Fort Bull ; after its destruction, it

1326-434: A symmetrical valley sides. He argues that the symmetrical valley sides are the direct result of rapid down-cutting of a watercourse into bedrock. In addition, as proposed by Rich, Thornbury argues that incised valleys with a pronounced asymmetry of cross section, which he called ingrown meanders , are the result of the lateral migration and incision of a meander during a period of slower channel downcutting . Regardless,

1428-414: A ton, and that from Albany to Niagara by half. Down the canals came furs, lumber, pot and pearl ashes, wheat, and salt, and up them moved boats 'principally laded with European or Indian productions or manufactures'." In 1812 about 1500 tons of cargo was moved through Rome by this route. In the mid 19th century, John MacGregor wrote of the waterway, "However imperfect the navigation, as compared with that of

1530-546: A watercourse is the ratio of the length of the channel to the straight line down-valley distance. Streams or rivers with a single channel and sinuosities of 1.5 or more are defined as meandering streams or rivers. The term derives from the winding river Menderes located in Asia-Minor and known to the Ancient Greeks as Μαίανδρος Maiandros ( Latin : Maeander ), characterised by a very convoluted path along

1632-413: A waveform the meandering stream follows the down-valley axis, a straight line fitted to the curve such that the sum of all the amplitudes measured from it is zero. This axis represents the overall direction of the stream. At any cross-section the flow is following the sinuous axis, the centerline of the bed. Two consecutive crossing points of sinuous and down-valley axes define a meander loop. The meander

1734-525: Is 12,101 m /s (427,300 cu ft/s). The average discharge at the river's source, the outflow of Lake Ontario, is 7,410 m /s (262,000 cu ft/s). The St. Lawrence River includes Lake Saint Francis at Salaberry-de-Valleyfield , Lake Saint-Louis south of Montreal and Lake Saint Pierre east of Montreal. It encompasses four archipelagoes : the Thousand Islands chain near Alexandria Bay, New York and Kingston, Ontario ;

1836-419: Is called lateral accretion. Lateral accretion occurs mostly during high water or floods when the point bar is submerged. Typically, the sediment consists of either sand, gravel, or a combination of both. The sediment comprising some point bars might grade downstream into silty sediments. Because of the decreasing velocity and strength of current from the thalweg of the channel to the upper surface of point bar when

1938-518: Is in Canada and 505,000 km (194,981.6 sq mi) is in the United States. The basin covers parts of Ontario and Quebec in Canada, parts of Minnesota , Wisconsin , Illinois , Indiana , Ohio , Pennsylvania , New York , Vermont , and nearly the entirety of the state of Michigan in the United States. The average discharge below the Saguenay River is 16,800 cubic metres per second (590,000 cu ft/s). At Quebec City, it

2040-420: Is known as a meander belt . It typically ranges from 15 to 18 times the width of the channel. Over time, meanders migrate downstream, sometimes in such a short time as to create civil engineering challenges for local municipalities attempting to maintain stable roads and bridges. The degree of meandering of the channel of a river, stream, or other watercourse is measured by its sinuosity . The sinuosity of

2142-433: Is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank or river cliff ) and deposits sediments on an inner, convex bank which is typically a point bar . The result of this coupled erosion and sedimentation is the formation of a sinuous course as the channel migrates back and forth across the axis of a floodplain . The zone within which a meandering stream periodically shifts its channel

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2244-424: Is produced by the gradual outward migration of the meander as a river cuts downward into bedrock. A terrace on the slip-off slope of a meander spur, known as slip-off slope terrace , can be formed by a brief halt during the irregular incision by an actively meandering river. The meander ratio or sinuosity index is a means of quantifying how much a river or stream meanders (how much its course deviates from

2346-458: Is readily eroded and carried toward the middle of the channel. The sediment eroded from a cut bank tends to be deposited on the point bar of the next downstream meander, and not on the point bar opposite it. This can be seen in areas where trees grow on the banks of rivers; on the inside of meanders, trees, such as willows, are often far from the bank, whilst on the outside of the bend, the tree roots are often exposed and undercut, eventually leading

2448-478: Is the length along the centerline. Once a channel begins to follow a sinusoidal path, the amplitude and concavity of the loops increase dramatically. This is due to the effect of helical flow which sweeps dense eroded material towards the inside of the bend, and leaves the outside of the bend unprotected and vulnerable to accelerated erosion. This establishes a positive feedback loop . In the words of Elizabeth A. Wood: "...this process of making meanders seems to be

2550-405: Is the most common type of fluvial lake, is a crescent-shaped lake that derives its name from its distinctive curved shape. Oxbow lakes are also known as cutoff lakes . Such lakes form regularly in undisturbed floodplains as a result of the normal process of fluvial meandering. Either a river or stream forms a sinuous channel as the outer side of its bends are eroded away and sediments accumulate on

2652-430: Is two consecutive loops pointing in opposite transverse directions. The distance of one meander along the down-valley axis is the meander length or wavelength . The maximum distance from the down-valley axis to the sinuous axis of a loop is the meander width or amplitude . The course at that point is the apex. In contrast to sine waves, the loops of a meandering stream are more nearly circular. The curvature varies from

2754-712: The American Revolutionary War , when British, Loyalist and indigenous forces came down from Canada and up Wood Creek to besiege the fort. They were unsuccessful, which contributed to the defeat of British forces at the Battles of Saratoga shortly thereafter. The disastrous outcome of the 1777 British campaign is considered a turning point in the American Revolution. In 1791, following the American Revolutionary War and

2856-559: The Gulf of Saint Lawrence . The St. Lawrence River is today partly within the U.S. and as such is that country's sixth oldest surviving European place-name. The earliest regular Europeans in the area were the Basques , who came to the St Lawrence Gulf and River in pursuit of whales from the early 16th century. The Basque whalers and fishermen traded with indigenous Americans and set up settlements, leaving vestiges all over

2958-415: The Gulf of St. Lawrence , often given as the largest estuary in the world. The estuary begins at the eastern tip of Île d'Orléans , just downstream from Quebec City. The river becomes tidal around Quebec City. The St. Lawrence River runs 3,058 kilometres (1,900  mi ) from the farthest headwater to the mouth and 1,197 km (743.8 mi) from the outflow of Lake Ontario. These numbers include

3060-829: The Hochelaga Archipelago , including the Island of Montreal and Île Jésus ( Laval ); the Lake St. Pierre Archipelago (classified a biosphere world reserve by the UNESCO in 2000) and the smaller Mingan Archipelago . Other islands include Île d'Orléans near Quebec City and Anticosti Island north of the Gaspé . It is the second longest river in Canada. Lake Champlain and the Ottawa , Richelieu , Saint-Maurice , Saint-François , Chaudière and Saguenay rivers drain into

3162-646: The Oneida Carry (present-day Rome). The relaunched boats then navigated downstream to Oneida Lake and the Oswego River , which discharges into Lake Ontario. Wood Creek and the Carry were used by the canoes of Native Americans, and in 1702 representatives of The Five Nations petitioned Lord Cornbury , the governor of the British colony of New York, to mark the Carry and to clear Wood Creek of obstructions. In addition to periodically clearing obstructions, in 1730

Wood Creek - Misplaced Pages Continue

3264-483: The Ozark Plateau . As noted above, it was initially either argued or presumed that an incised meander is characteristic of an antecedent stream or river that had incised its channel into underlying strata . An antecedent stream or river is one that maintains its original course and pattern during incision despite the changes in underlying rock topography and rock types. However, later geologists argue that

3366-406: The bateaux were dragged on sledges and launched onto the dark and tortuous stream, which, fed by a decoction of forest leaves that oozed from the marshy shores, crept in shadow through depths of foliage, with only a belt of illumined sky gleaming between the jagged tree-tops. In the 18th century, boats and their cargoes coming up the Mohawk River had to be moved a few miles overland to Wood Creek at

3468-449: The bedrock are known as either incised , intrenched , entrenched , inclosed or ingrown meanders . Some Earth scientists recognize and use a finer subdivision of incised meanders. Thornbury argues that incised or inclosed meanders are synonyms that are appropriate to describe any meander incised downward into bedrock and defines enclosed or entrenched meanders as a subtype of incised meanders (inclosed meanders) characterized by

3570-556: The Atlantic seaboard had ended. St. Lawrence River The St. Lawrence River ( French : Fleuve Saint-Laurent ) is a large international river in the middle latitudes of North America connecting the Great Lakes to the North Atlantic Ocean . Its waters flow in a northeasterly direction from Lake Ontario to the Gulf of St. Lawrence , traversing Ontario and Quebec in Canada and New York in

3672-483: The Erie Canal, which superseded it, its influence on the prosperity, the early and rapid settlement of western New York, is incalculable." However, Shaw concluded that "even with the company's works in operation the river boats could never supplant wagon carriage by land ... The canal builders of this period must be judged to have left a record more of failure than success." Nonetheless, thousands of workmen had learned

3774-597: The St. Lawrence upstream to Montreal and the Ottawa River after Montreal. The St. Lawrence River served as the main route for European exploration of the North American interior, first pioneered by French explorer Samuel de Champlain . Control of the river was crucial to British strategy to capture New France in the Seven Years' War . Having captured Louisbourg in 1758, the British sailed up to Quebec

3876-639: The St. Lawrence. The St. Lawrence River is in a seismically active zone where fault reactivation is believed to occur along late Proterozoic to early Paleozoic normal faults related to the opening of the Iapetus Ocean . The faults in the area are rift -related and comprise the Saint Lawrence rift system . According to the United States Geological Survey, the St. Lawrence Valley is a physiographic province of

3978-852: The United States). The Seaway (including the Welland Canal ) now permits ocean-going vessels to pass all the way to Lake Superior . During the Second World War , the Battle of the St. Lawrence involved submarine and anti-submarine actions throughout the lower St. Lawrence River and the entire Gulf of St. Lawrence , Strait of Belle Isle and Cabot Strait from May to October 1942, September 1943, and again in October and November 1944. During this time, German U-boats sank several merchant marine ships and three Canadian warships. In

4080-662: The United States. A section of the river demarcates the Canada–U.S. border . As the primary drainage outflow of the Great Lakes Basin , the St. Lawrence has the second-highest discharge of any river in North America (after the Mississippi River ) and the 16th-highest in the world. The estuary of St. Lawrence is often cited by scientists as the largest in the world. Significant natural landmarks of

4182-565: The ancient Greek town of Miletus , now Milet, Turkey. It flows through series of three graben in the Menderes Massif, but has a flood plain much wider than the meander zone in its lower reach. Its modern Turkish name is the Büyük Menderes River . Meanders are a result of the interaction of water flowing through a curved channel with the underlying river bed. This produces helicoidal flow , in which water moves from

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4284-411: The average fullbank channel width. The length of the stream is measured by channel, or thalweg, length over the reach, while the bottom value of the ratio is the downvalley length or air distance of the stream between two points on it defining the reach. The sinuosity index plays a part in mathematical descriptions of streams. The index may require elaboration, because the valley may meander as well—i.e.,

4386-652: The backbone of the St. Lawrence Seaway , a lock and canal system that enables world marine traffic to access the inland ports of the Great Lakes Waterway . The river has been called a variety of names by local First Nations . Beginning in the 16th century, French explorers visited what is now Canada and gave the river names such as the Grand fleuve de Hochelaga and the Grande rivière du Canada , where fleuve and rivière are two French words ( fleuve being

4488-471: The boats floated and on their way. Yet in spite of its fragility, Wood Creek was the lynchpin of the waterway route to the Great Lakes." Among the improvements to the Wood Creek waterway were 13 short canals cut in 1793 that bypassed meanders (or "hooks") in the creek; the cuts were "among the earliest artificial waterways for navigation in North America". In 1802 four wooden locks were constructed to aid

4590-554: The bottom from the outside to the inside. The flow is supplied by a counter-flow across the surface from the inside to the outside. This entire situation is very similar to the Tea leaf paradox . This secondary flow carries sediment from the outside of the bend to the inside making the river more meandering. As to why streams of any size become sinuous in the first place, there are a number of theories, not necessarily mutually exclusive. The stochastic theory can take many forms but one of

4692-404: The boundary layer, pressure force dominates and fluid moves along the bottom of the river from the outside bend to the inside bend. This initiates helicoidal flow: Along the river bed, fluid roughly follows the curve of the channel but is also forced toward the inside bend; away from the river bed, fluid also roughly follows the curve of the channel but is forced, to some extent, from the inside to

4794-444: The brothers Gaspar and Miguel Corte-Real . The first European explorer known to have sailed up the St. Lawrence River itself was Jacques Cartier . At that time, the land along the river described as "about two leagues, a mountain as tall as a heap of wheat" was inhabited by the St. Lawrence Iroquoians . During Cartier's second voyage in 1535, because Cartier arrived in the estuary on Saint Lawrence 's feast day 10 August, he named it

4896-559: The case of the Anderson Bottom Rincon, incised meanders that have either steep-sided, often vertical walls, are often, but not always, known as rincons in the southwest United States . Rincon in English is a nontechnical word in the southwest United States for either a small secluded valley, an alcove or angular recess in a cliff, or a bend in a river. The meanders of a stream or river that has cut its bed down into

4998-654: The coast of eastern Canada and deep into the St. Lawrence River. Basque commercial and fishing activity reached its peak before the Armada Invencible ' s disaster (1588), when the Basque whaling fleet was confiscated by King Philip II of Spain . Initially, the whaling galleons from Labourd were not affected by the Spanish defeat. Until the early 17th century, the French used the name Rivière du Canada to designate

5100-407: The context of meandering rivers, a boundary layer exists within the thin layer of fluid that interacts with the river bed. Inside that layer and following standard boundary-layer theory, the velocity of the fluid is effectively zero. Centrifugal force, which depends on velocity, is also therefore effectively zero. Pressure force, however, remains unaffected by the boundary layer. Therefore, within

5202-408: The curvature of the bend, and the faster the flow, the stronger is the cross-current and the sweeping. Due to the conservation of angular momentum the speed on the inside of the bend is faster than on the outside. Since the flow velocity is diminished, so is the centrifugal pressure. The pressure of the super-elevated column prevails, developing an unbalanced gradient that moves water back across

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5304-405: The downvalley length is not identical to the reach. In that case the valley index is the meander ratio of the valley while the channel index is the meander ratio of the channel. The channel sinuosity index is the channel length divided by the valley length and the standard sinuosity index is the channel index divided by the valley index. Distinctions may become even more subtle. Sinuosity Index has

5406-726: The estuary, and it reaches the east of Les Méchins at the end of December. Ice covers the entire Gulf of St. Lawrence in January and February. Ice helps navigation by preventing the formation of waves, and therefore spray, and prevents the icing of ships. With the draining of the Champlain Sea , due to a rebounding continent from the Last Glacial Maximum , the St. Lawrence River was formed. The Champlain Sea lasted from about 13,000 years ago to about 10,000 years ago and

5508-521: The estuary; without the estuary, the length from Lake Ontario is c. 500 km (c. 300 mi). The farthest headwater is the North River in the Mesabi Range at Hibbing , Minnesota. Its drainage area, which includes the Great Lakes, the world's largest system of freshwater lakes, is 1,344,200 square kilometres (518,998.5 sq mi), of which 839,200 km (324,016.9 sq mi)

5610-488: The first major step to the development of a greater project that would go far beyond Seneca Lake and Oswego, reaching its destination on the shores of Lake Erie." In 1817 New York State chartered the Erie Canal , which would solve the myriad problems of the Albany-Oswego waterway by building a system of unprecedented size and sophistication. In 1820 the works of the Western Inland Lock Navigation Company were purchased for

5712-510: The following year thanks to charts drawn up by James Cook . British troops were ferried via the St. Lawrence to attack the city from the west, which they successfully did at the Battle of the Plains of Abraham . The river was used again by the British to defeat the French siege of Quebec under the Chevalier de Lévis in 1760. In 1809, the first steamboat to ply its trade on the St. Lawrence

5814-565: The formation of both entrenched meanders and ingrown meanders is thought to require that base level falls as a result of either relative change in mean sea level , isostatic or tectonic uplift, the breach of an ice or landslide dam, or regional tilting. Classic examples of incised meanders are associated with rivers in the Colorado Plateau , the Kentucky River Palisades in central Kentucky , and streams in

5916-695: The former country of the St. Lawrence Iroquois and then three of the six homelands of the Haudenosaunee : the Mohawk or Kanienʼkehá꞉ka , the Oneida or Onyota'a:ka , and the Onondaga or Onöñda’gaga’ . In the early 17th century, the Huron-Wendat Nation migrated from their original country of Huronia to what is now known as Nionwentsïo centred around Wendake . Nionwentsïo occupies both

6018-428: The full force of the flood. After a cutoff meander is formed, river water flows into its end from the river builds small delta-like feature into either end of it during floods. These delta-like features block either end of the cutoff meander to form a stagnant oxbow lake that is separated from the flow of the fluvial channel and independent of the river. During floods, the flood waters deposit fine-grained sediment into

6120-404: The fullbank channel width and 3 to 5 times, with an average of 4.7 times, the radius of curvature at the apex. This radius is 2–3 times the channel width. A meander has a depth pattern as well. The cross-overs are marked by riffles , or shallow beds, while at the apices are pools. In a pool direction of flow is downward, scouring the bed material. The major volume, however, flows more slowly on

6222-625: The independence of the United States, the Western Inland Lock Navigation Company was chartered in New York State to make improvements in the Albany-Oswego waterway. Philip Lord has written, "This tortuous route was the only highway west of any consequence 200 years ago and it was the improvement of this water route from Schenectady to Oneida Lake that was the mission of Philip Schuyler's Western Inland Lock Navigation Company in 1792." When completed in 1803,

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6324-440: The inland waterways was Wood Creek, a narrow and twisted channel which connected the west end of the 1797 Rome Canal to the east end of Oneida Lake (now Sylvan Beach). This stream was so narrow that travelers often recorded they could jump across it where the boats first entered it, and it was so deficient of water that boatmen often had to negotiate with a miller just above the landing place to release extra water from his pond to get

6426-416: The inner side, which forms a meandering horseshoe-shaped bend. Eventually as the result of its meandering, the fluvial channel cuts through the narrow neck of the meander and forms a cutoff meander. The final break-through of the neck, which is called a neck cutoff , often occurs during a major flood because that is when the watercourse is out of its banks and can flow directly across the neck and erode it with

6528-443: The inside bank of a river bend. On the inside bend, this sediment and debris is eventually deposited on the slip-off slope of a point bar. Scroll-bars are a result of continuous lateral migration of a meander loop that creates an asymmetrical ridge and swale topography on the inside of the bends. The topography is generally parallel to the meander, and is related to migrating bar forms and back bar chutes, which carve sediment from

6630-406: The inside of the bend where, due to decreased velocity, it deposits sediment. The line of maximum depth, or channel, is the thalweg or thalweg line. It is typically designated the borderline when rivers are used as political borders. The thalweg hugs the outer banks and returns to center over the riffles. The meander arc length is the distance along the thalweg over one meander. The river length

6732-675: The larger Appalachian division, containing the Champlain section. However, in Canada, where most of the valley is, it is instead considered part of a distinct St. Lawrence Lowlands physiographic division, and not part of the Appalachian division at all. The source of the North River in the Mesabi Range in Minnesota (Seven Beaver Lake) is considered to be the source of the St. Lawrence River. Because it crosses so many lakes,

6834-546: The late 1970s, the river was the subject of a successful ecological campaign (called "Save the River"), originally responding to planned development by the United States Army Corps of Engineers . The campaign was organized, among others, by Abbie Hoffman . [[Category:Rivers Meander A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse . It

6936-483: The lower reach. As a result, even in Classical Greece (and in later Greek thought) the name of the river had become a common noun meaning anything convoluted and winding, such as decorative patterns or speech and ideas, as well as the geomorphological feature. Strabo said: ‘...its course is so exceedingly winding that everything winding is called meandering.’ The Meander River is south of Izmir, east of

7038-490: The major rivers that flow into the Great Lakes. Great Lakes tributaries are listed in alphabetical order. The list includes all tributaries with a drainage area of at least 1,000 square kilometres and an average flow of more than 10 cubic metres per second. tributary The diversity of the St. Lawrence River includes: Large marine mammals travel in all the seas of the earth, the research and observations of these giants concern fishermen and shipping industry , exercise

7140-420: The meanders are fixed. Various mathematical formulae relate the variables of the meander geometry. As it turns out some numerical parameters can be established, which appear in the formulae. The waveform depends ultimately on the characteristics of the flow but the parameters are independent of it and apparently are caused by geologic factors. In general the meander length is 10–14 times, with an average 11 times,

7242-418: The more heterogeneous braided river deposits. There are two distinct patterns of scroll-bar depositions; the eddy accretion scroll bar pattern and the point-bar scroll pattern. When looking down the river valley they can be distinguished because the point-bar scroll patterns are convex and the eddy accretion scroll bar patterns are concave. Scroll bars often look lighter at the tops of the ridges and darker in

7344-504: The most general statements is that of Scheidegger: "The meander train is assumed to be the result of the stochastic fluctuations of the direction of flow due to the random presence of direction-changing obstacles in the river path." Given a flat, smooth, tilted artificial surface, rainfall runs off it in sheets, but even in that case adhesion of water to the surface and cohesion of drops produce rivulets at random. Natural surfaces are rough and erodible to different degrees. The result of all

7446-624: The north and south shores of the river, overlapping with Nitassinan and the more western Wabanaki or Dawnland countries. Adjacent on the north shore is the Atikamekw territorial homeland of Nitaskinan and, upstream, the further reaches of Anishinaabewaki, specifically the homelands of the Algonquin and Mississauga Nations. The Norse explored the Gulf of St. Lawrence in the 11th century and were followed by fifteenth- and early sixteenth-century European mariners, such as John Cabot , and

7548-416: The outer to the inner bank along the river bed, then flows back to the outer bank near the surface of the river. This in turn increases carrying capacity for sediments on the outer bank and reduces it on the inner bank, so that sediments are eroded from the outer bank and redeposited on the inner bank of the next downstream meander. When a fluid is introduced to an initially straight channel which then bends,

7650-401: The outside bend and high fluid velocity at the inside bend. This classic fluid mechanics result is irrotational vortex flow. In the context of meandering rivers, its effects are dominated by those of secondary flow. Secondary flow : A force balance exists between pressure forces pointing to the inside bend of the river and centrifugal forces pointing to the outside bend of the river. In

7752-436: The outside bend. The higher velocities at the outside bend lead to higher shear stresses and therefore result in erosion. Similarly, lower velocities at the inside bend cause lower shear stresses and deposition occurs. Thus meander bends erode at the outside bend, causing the river to becoming increasingly sinuous (until cutoff events occur). Deposition at the inside bend occurs such that for most natural meandering rivers,

7854-529: The outside of the curve and deposit sediment in the slower flowing water on the inside of the loop, in a process called lateral accretion. Scroll-bar sediments are characterized by cross-bedding and a pattern of fining upward. These characteristics are a result of the dynamic river system, where larger grains are transported during high energy flood events and then gradually die down, depositing smaller material with time (Batty 2006). Deposits for meandering rivers are generally homogeneous and laterally extensive unlike

7956-415: The oxbow lake. As a result, oxbow lakes tend to become filled in with fine-grained, organic-rich sediments over time. A point bar , which is also known as a meander bar , is a fluvial bar that is formed by the slow, often episodic, addition of individual accretions of noncohesive sediment on the inside bank of a meander by the accompanying migration of the channel toward its outer bank. This process

8058-456: The passage from the end of the Rome Canal to the junction with Canada Creek; unusually, the locks were "covered", as was common for bridges in this region in the 19th century. Lord and Salisbury have also discovered that a man named Abraham Ogden had used a sophisticated method known as "brushpiling" or a "kid weir" to improve navigation on Wood Creek; they write, "it is in the upper reaches of this tiny stream that we find extraordinary evidence of

8160-475: The physical factors acting at random is channels that are not straight, which then progressively become sinuous. Even channels that appear straight have a sinuous thalweg that leads eventually to a sinuous channel. In the equilibrium theory, meanders decrease the stream gradient until an equilibrium between the erodibility of the terrain and the transport capacity of the stream is reached. A mass of water descending must give up potential energy , which, given

8262-630: The program of improvements would greatly increase the shipping along the waterway and substantially reduce its cost. The increasing population of settlers in western New York was also served by this waterway. The route to the western regions passed through Oneida Lake and the Oneida River. It then followed the Seneca River upstream, instead of going downstream to Oswego. This route stretched as far as Rochester and Canandaigua Lake . Philip Lord and Chris Salisbury write, "The most troublesome of

8364-407: The replacement of the relatively small boats ( batteaux ) by heavier craft. As noted by Ronald E. Shaw , "These improvements made it possible in times of sufficient water for new Durham boats as long as sixty feet and carrying sixteen tons to supplant those carrying only a ton and a half used heretofore on the river. The cost of transportation from Albany to Seneca Lake was reduced from $ 100 to $ 32

8466-514: The river and estuary include the 1,864 river islands of the Thousand Islands , the endangered whales of Saguenay–St. Lawrence Marine Park , and the limestone monoliths of the Mingan Archipelago . Long a transportation route to Indigenous peoples , the St. Lawrence River has played a key role in the history of Canada and in the development of cities such as Montreal and Quebec City . The river remains an important shipping route as

8568-852: The river borders Mi'kma'ki in the South (what is today known as the Canadian Maritimes ), and Nitassinan in the North, the national territory of the Innu people . On the south shore beyond the Mi'kmaw district of Gespe'gewa'ki , the river passes Wolastokuk (the Maliseet homeland), Pαnawαhpskewahki (the Penobscot homeland), and Ndakinna (the Abenaki homeland). Continuing, the river passes through

8670-691: The river width remains nearly constant, even as the river evolves. In a speech before the Prussian Academy of Sciences in 1926, Albert Einstein suggested that because the Coriolis force of the earth can cause a small imbalance in velocity distribution, such that velocity on one bank is higher than on the other, it could trigger the erosion on one bank and deposition of sediment on the other that produces meanders However, Coriolis forces are likely insignificant compared with other forces acting to produce river meanders. The technical description of

8772-416: The same velocity at the end of the drop as at the beginning, is removed by interaction with the material of the stream bed. The shortest distance; that is, a straight channel, results in the highest energy per unit of length, disrupting the banks more, creating more sediment and aggrading the stream. The presence of meanders allows the stream to adjust the length to an equilibrium energy per unit length in which

8874-417: The sediment is deposited the vertical sequence of sediments comprising a point bar becomes finer upward within an individual point bar. For example, it is typical for point bars to fine upward from gravel at the base to fine sands at the top. The source of the sediment is typically upstream cut banks from which sand, rocks and debris has been eroded, swept, and rolled across the bed of the river and downstream to

8976-505: The shape of an incised meander is not always, if ever, "inherited", e.g., strictly from an antecedent meandering stream where its meander pattern could freely develop on a level floodplain. Instead, they argue that as fluvial incision of bedrock proceeds, the stream course is significantly modified by variations in rock type and fractures , faults , and other geological structures into either lithologically conditioned meanders or structurally controlled meanders . The oxbow lake , which

9078-445: The shortest possible path). It is calculated as the length of the stream divided by the length of the valley . A perfectly straight river would have a meander ratio of 1 (it would be the same length as its valley), while the higher this ratio is above 1, the more the river meanders. Sinuosity indices are calculated from the map or from an aerial photograph measured over a distance called the reach , which should be at least 20 times

9180-421: The sidewalls induce a pressure gradient that causes the fluid to alter course and follow the bend. From here, two opposing processes occur: (1) irrotational flow and (2) secondary flow . For a river to meander, secondary flow must dominate. Irrotational flow : From Bernoulli's equations, high pressure results in low velocity. Therefore, in the absence of secondary flow we would expect low fluid velocity at

9282-411: The sinuous axis. A loop at the apex has an outer or concave bank and an inner or convex bank. The meander belt is defined by an average meander width measured from outer bank to outer bank instead of from centerline to centerline. If there is a flood plain , it extends beyond the meander belt. The meander is then said to be free—it can be found anywhere in the flood plain. If there is no flood plain,

9384-419: The stream carries away all the sediment that it produces. Geomorphic refers to the surface structure of the terrain. Morphotectonic means having to do with the deeper, or tectonic (plate) structure of the rock. The features included under these categories are not random and guide streams into non-random paths. They are predictable obstacles that instigate meander formation by deflecting the stream. For example,

9486-403: The stream might be guided into a fault line (morphotectonic). A cut bank is an often vertical bank or cliff that forms where the outside, concave bank of a meander cuts into the floodplain or valley wall of a river or stream. A cutbank is also known either as a river-cut cliff , river cliff , or a bluff and spelled as cutbank . Erosion that forms a cut bank occurs at the outside bank of

9588-416: The swales. This is because the tops can be shaped by wind, either adding fine grains or by keeping the area unvegetated, while the darkness in the swales can be attributed to silts and clays washing in during high water periods. This added sediment in addition to water that catches in the swales is in turn is a favorable environment for vegetation that will also accumulate in the swales. Depending upon whether

9690-576: The trades of canal builders, and the de facto engineers of the waterway had acquired experience and vision. Shaw writes that these men "bent on improving the navigation on the Mohawk at the turn of the century would be intimately involved with the New York canals for the remainder of their lives. Their experiences in canal making were being stored for future use. Limited as was their success, the efforts of these men to develop an inland water empire served as

9792-406: The trees to fall into the river. A meander cutoff , also known as either a cutoff meander or abandoned meander , is a meander that has been abandoned by its stream after the formation of a neck cutoff. A lake that occupies a cutoff meander is known as an oxbow lake . Cutoff meanders that have cut downward into the underlying bedrock are known in general as incised cutoff meanders . As in

9894-399: The use of the Erie Canal, which bypassed the Wood Creek to Oswego portion of the old waterway in favor of a direct canal from Rome through Syracuse and Rochester to Buffalo , on Lake Erie . The Rome Canal and the waterway running west along Wood Creek to Oneida Lake were abandoned. The century when tiny Wood Creek was a channel for much of the cargo between the inlands of North America and

9996-458: The water system frequently changes its name. From source to mouth, the names are: The St. Lawrence River also passes through Lake Saint-Louis and Lake Saint-Pierre in Quebec. The St. Lawrence River and the largest tributaries of the Great Lakes . The St. Lawrence River tributaries are listed upstream from the mouth. The major tributaries of the inter-lake sections are also shown, as well as

10098-427: Was briefly replaced by Fort Wood Creek. After the loss of Fort Oswego to the French forces in 1756, the British destroyed the Oneida Carry and Wood Creek fortifications. In 1758, the massive Fort Stanwix was constructed to defend the Oneida Carry, although it never saw action and was later abandoned. The fort was refurbished by American revolutionary forces in 1777. Stanwix was the site of an important 1777 battle in

10200-526: Was built and operated by John Molson and associates, a scant two years after Fulton's steam-powered navigation of the Hudson River . The Accommodation with ten passengers made her maiden voyage from Montreal to Quebec City in 66 hours, for 30 of which she was at anchor. She had a keel of 75 feet, and a length overall of 85 feet. The cost of a ticket was eight dollars upstream, and nine dollars down. She had berths that year for twenty passengers. Within

10302-410: Was continuously shrinking during that time, a process that continues today. The head of the St. Lawrence River, near Lake Ontario, is home to the Thousand Islands . Today, the St. Lawrence River begins at the outflow of Lake Ontario and flows adjacent to Gananoque , Brockville , Morristown , Ogdensburg , Massena , Cornwall , Montreal , Trois-Rivières , and Quebec City before draining into

10404-463: Was originally applied to the eponymous bay by Jacques Cartier upon his arrival into the region on the 10th of August feast day for Saint Lawrence in 1535. Indigenous people use the following names: In winter, the St. Lawrence River begins producing ice in December, with the formation of ice cubes between Montreal and Quebec City . The prevailing winds and currents push this ice towards

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