Question

Which of the following is/are responsible for riverbed or riverbank erosion?
A)Flow of particles
B)Sand particles
C)Pebbles
D)All of the above

Answer 1

Hint:Erosion is a geological process in which natural forces like wind and water wear away and transfer earthen materials. Weathering is a comparable process that breaks down or dissolves rock without any movement.

Complete answer:
 The rapid flow of water, sand particles, pebbles, and other debris, as well as the different tributaries that join the main river, erode the riverbed and river banks. All of these factors combine to create gorges, V-shaped valleys, and waterfalls.

A riverbed is the physical confinement of regular water flow in a stream or river. During all but flood stages, the lateral bounds or channel margins are referred to as stream banks or river banks. A river can branch from one stream bed to many stream beds under specific conditions. When a stream overflows its banks and pours onto the floodplain, it is called a flood.

All riverbanks erode, but the extent to which they fail is determined by the location and pace of erosion. House location, water saturation, weight on the river bank, vegetation, and/or tectonic activity can all contribute to riverbank failure.

The properties of the bank material will determine how a river bank reacts to erosion. A stratified or interstratified bank, which comprises cohesionless layers interspersed with cohesive layers, is the most frequent type of bank. The retreat rate of the overlaying layer will be controlled if the cohesive soil is at the toe of the bank.

Hence the correct answer is option ‘D'.

Note: There are three zones on a riverbank: toe zone, bank zone, and overbank area. The toe zone is the part of the foot that is most prone to erosion. It is heavily influenced by currents and erosional events because it is situated between ordinary and low water levels.