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Riverine Features
Riverine Features and Processes
Term | Definition |
---|---|
Solution | Dissolved rock (invisible) |
Hydraulic action | Force of moving water breaking material from bed and banks. |
Source | The place where a river begins. |
River course | The route taken by a river between its source and its mouth. |
River basin | The total area drained by a river and its tributaries. |
Delta | These form at the mouth of the river due deposition of material. The main channel splits into many smaller distributaries. |
Levee | Natural embankments that form along the river in the lower course. caused by the deposition of heavy material in floods. |
Floodplain | Large, flat & fertile areas by the side of a river in the lower course, caused by deposition of soil/silt in times of flood. |
Distributary | A river branch flowing away from the main stream. |
Load | Total amount of sediment being transported, including dissolved, suspended and bed. |
Meander | The water flows the fastest around the outside of a river bend. This erodes it and widens the bend. On the inside of the bend the water is travelling slowly and this leads to deposition. |
Plain | A broad area of relatively flat land. |
Traction | The rolling of stones & rocks. Usually larger rocks. |
Saltation | Stones/rocks bouncing. Usually smaller rocks due to the energy required. |
Tributary | A stream or river which joins a larger river. |
Interlocking spurs | Areas of high ground which seem to ‘lock’ into each other as they stick out across a V-shaped valley. |
Attrition | The breaking of stones when they collide with other material. |
Ox-bow lake | Two meanders may get so wide that they join up. When this occurs the river takes the shortest route and the meander becomes cut-off. |
Alluvium | A deposit of clay, silt, and sand left by flowing floodwater in a river valley or delta, typically producing fertile soil. |
Deposition | Process that occurs when the river loses its energy and drops its load. |
Confluence | The joining of a tributary to the larger channel. |
Mouth | The wide end of the river, where it meets the sea. |
Watershed | The outer limit of the drainage basin. |
Corrosion | The dissolving of rock (limestone etc) by acid in the water. |
Estuary | The zone of mixing between the river and the ocean. |
Pothole | Pebbles carried by swirling water abrade small circular depressions into the rocky riverbed. |
Abrasion | The scraping action of material being transported. |
Waterfall | Where a band or hard rock lies on an area of soft rock. The soft rock erodes so that a vertical drop develops and a plunge pool. forms at the base. |
V-Shaped valley | Young rivers erode vertically to form vales with steep sides and narrow floors. |
Suspension | Very small particles being carried along in the river current. |