![other words for running its course other words for running its course](https://i.kym-cdn.com/photos/images/original/001/427/956/757.png)
Corrasion or Abration: As the rock particles bounce, scrape and drag along the bottom and sides of the river, they break off additional rock fragments.They are corrasion, corrosion, hydraulic action etc. The work of river erosion is accomplished in different ways, all of which may operate together. This load acts as a grinding tool helping in cutting the bottom and sides of the river bed, resulting in deepening and widening of the river channel.The rock materials carried by erosion is the load of the river.Erosion occurs when overland flow moves soil particles downslope.Running water: erosion, transportation, and deposition Landforms like braided channels, floodplains, levees, meanders, oxbow lakes, deltas etc.The work of the river is mainly deposition, building up its bed and forming an extensive flood plain.Vertical erosion has almost stopped and lateral erosion still goes on.The river starts to flow through a broad, level plain with heavy debris brought down from upper and middle courses.Lower Course/ Stage of Old (Deposition dominates): Landforms like alluvial fans, piedmont alluvial plains, meanders etc.The work of river predominantly becomes transportation of the eroded materials from the upper course (little deposition too).Wider flood plains start to visible in this course and the volume of water increases with the confluence of many tributaries.Streams are plenty at this stage with good integration.
![other words for running its course other words for running its course](https://edx.readthedocs.io/projects/edx-partner-course-staff/en/latest/_images/Qualtrics.png)
![other words for running its course other words for running its course](https://images.saymedia-content.com/.image/ar_4:3%2Cc_fill%2Ccs_srgb%2Cfl_progressive%2Cq_auto:eco%2Cw_1200/MTgzOTMzNTkwNDMyNzIwNzgx/signs-that-your-relationship-has-run-its-course.jpg)
Thus, the river channel causes the gradual disappearance of its V-shaped valley (not completely).In this stage, vertical erosion slowly starts to replace with lateral erosion or erosion from both sides of the channel.Middle Course/ Stage of Maturity (Transportation dominates): Waterfalls, rapids, and gorges exist where the local hard rock bodies are exposed.As the river flows down with high velocity, vertical erosion or downward cutting will be high which results in the formation of V-Shaped Valleys.Streams are few, with poor integration.The river flows down the steep slope and, as a result, its velocity and eroding power are at their maximum.It starts from the source of the river in hilly or mountainous areas.Upper Course / Stage of Youth (Erosion dominates): Once a valley is formed, it later develops into a stream or river.Ī river, which is the best example of the linear flow of running water through a valley, can be divided into three, on the basis of its course – upper course, middle course and lower course.(Note: A valley can be formed in various ways like faulting, but here we are dealing only with the formation by means of exogenic geomorphic agent). These rills will gradually develop into long and wide gullies, the gullies will further deepen, widen and lengthen and unite to give rise to a network of valleys.During the sheet erosion, minor or major quantities of materials from the surface of the land are removed in the direction of flow and gradual small and narrow rills will form.The overland flow causes sheet erosion and depending upon the irregularities of the land surface, the overland flow may concentrate into narrow to wide paths.Running water, which doesn’t need any further explanation, has two components: one is overland flow on the general land surface as a sheet and the other is linear flow as streams and rivers in valleys.which influence the evolution of these landforms. There are some other independent controls like (i) stability of sea level (ii) tectonic stability of landmass (iii) climate etc. They form various erosional (destructional) and depositional (constructional) landforms.Įven though we are considering the erosional and depositional activities and their landform creation, it should be kept in mind that they are always aided by weathering and mass movements. In this post, we are dealing with the geomorphic agents – running water and groundwater, which causes erosion and deposition. We have also seen that erosion and deposition are some of the exogenic processes. In the previous articles, we were discussing various types of endogenic and exogenic processes.