![]() Thalweg Deposition Point Bar Helicoidal Flow River Cliff Abrasion Hydraulic Action Riffle Pool Sinuosity Meander Centripetal Force 21. A sinuosity of 1.5 is the dividing line between a straight and meandering channel.As the water exits the meander the channel becomes shallower.This reduces the hydraulic radius thus increasing deposition. ![]() The two following videos show such wind shifts. Transfers and reverses motion around next alternating bend While meandering usually applies to nocturnal conditions, submeso motions with very weak daytime winds.Forced downward along river cliff, back towards point bar.In bends, water forced to outside of bend hits bank with force.This helicoidal flow allows material eroded from the outer bank to be moved to the point bar on the inside of the next meander downstream.The movement of water in a meander has been found to move from the outside to the inside.It is slower because the reduction in the rivers efficiency being reduced due to the frictional contact with the river bed.At the end of the animation a lake has formed. The river deposits (in yellow) are called: deltas alluvial fans barrier bars point bars. From the diagram above, can you tell which way the river is flowing from the left to the right from the right to the left both of the above could be correct. Slower flow on the inside of the bend leads to depostion there. the inside of a meander bend all along a meander bend.At times of high flow the water is thrown around the riffles and is thrown to the edge by centripetal force eroding and undercutting it.(MAINLY ABRASION AND HYDRAULIC ACTION).Thalweg the line of fastest flow in a river.The riffle reduces the hydraulic radius of that section of the channel as the water flows inefficiently over it.Ĩ.On average pools occur 5-6 times the width of the river bed.You will be able to explain the sequence using the key terminology.You will be able to explain the sequence involved in the formation of a meander.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |