Types of trees to control riverbank erosion in northeast india
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iver Bank Erosion in the World
River channels can be classified intoStraight – It is almost non-existent among natural rivers. Extremely short reaches of the river may be straight.Meandering – It a sinuous channel of river. A meander is formed when moving water in a river erodes the outer banks and widens its valley, and the inner part of the river has less energy and deposits silt.Braided – It is a channel that consists of a network of small channels separated by small and often temporary islands called braid bars. Braided channels occur in rivers with high slope and/or large sediment load.Anastomosing – Like braided channel branching of small channels from a single occurs at first, but after that separated channels again merge.
The controlling factor on river development is the amount of sediment that the river carries. Once a water way crosses a threshold value for sediment load, it will convert from a single channel meandering river to a braided channel (Leopold and Wolman, 1963). Bank erosion, however, occurs mainly in meandering rivers. In meandering rivers, river-channel migration takes place through erosion of the cut bank and deposition on the point bar. River-channel migration is the lateral motion of an alluvial river channel across its floodplain due to processes of erosion of and deposition on its banks and bars (Wikipedia definition). Meandering of a river is caused by nature but sometimes by human activities. Due to natural or human or both activities, most rivers in the world are subject to meandering along with bank erosion. But in view of devastation, the Mississippi-Missouri River System of North America, Ganges, Brahmaputra and Mekong Rivers of Asia, Amazon River of South America, and River Nile of Africa are most important among them.
River channels can be classified intoStraight – It is almost non-existent among natural rivers. Extremely short reaches of the river may be straight.Meandering – It a sinuous channel of river. A meander is formed when moving water in a river erodes the outer banks and widens its valley, and the inner part of the river has less energy and deposits silt.Braided – It is a channel that consists of a network of small channels separated by small and often temporary islands called braid bars. Braided channels occur in rivers with high slope and/or large sediment load.Anastomosing – Like braided channel branching of small channels from a single occurs at first, but after that separated channels again merge.
The controlling factor on river development is the amount of sediment that the river carries. Once a water way crosses a threshold value for sediment load, it will convert from a single channel meandering river to a braided channel (Leopold and Wolman, 1963). Bank erosion, however, occurs mainly in meandering rivers. In meandering rivers, river-channel migration takes place through erosion of the cut bank and deposition on the point bar. River-channel migration is the lateral motion of an alluvial river channel across its floodplain due to processes of erosion of and deposition on its banks and bars (Wikipedia definition). Meandering of a river is caused by nature but sometimes by human activities. Due to natural or human or both activities, most rivers in the world are subject to meandering along with bank erosion. But in view of devastation, the Mississippi-Missouri River System of North America, Ganges, Brahmaputra and Mekong Rivers of Asia, Amazon River of South America, and River Nile of Africa are most important among them.
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