It is erosion by flowing water, especially when the river is in spate, that can widen the river's banks.
Lateral or horizontal erosion means erosion taken place on the sides of a footpath or river bank. The opposite if lateral/horizontal erosion is vertical erosion, where erosion is taken place under the river bed or the bottom of a footpath.
Daniel H. Stern has written: 'Effects of bank stabilization on the physical and chemical characteristics of streams and small rivers' -- subject(s): Erosion, Rivers, Stream channelization, Streambank planting, Turbidity
water runnoff
Erosion typically occurs on the outer bank of meandering rivers due to the faster flow of water and increased energy. Deposition tends to occur on the inside bank where the water flow slows down and sediment is dropped. Over time, this process causes the meander to migrate and change shape.
Bank erosion is the process where the soil or rock of a river or stream bank is worn away by moving water. This can be caused by factors such as high flows, wave action, or human activities. Bank erosion can lead to loss of land, habitat destruction, and water pollution.
A bend or curve in a stream's channel caused by erosion is known as a meander. Meanders occur as the flowing water erodes the outer bank of a curve and deposits sediment on the inner bank, leading to a pronounced bend in the channel over time. Meanders are common in rivers and streams with gentle slopes and can contribute to the formation of oxbow lakes.
In geography, a bluff is a steep cliff or prominent headland along a shoreline, riverbank, or other landscape feature. It usually refers to a high, steep bank or cliff that is formed by erosion, weathering, or tectonic activity over time. Bluffs are common features in coastal areas and river valleys.
Please rephrase - the question is unclear.
erosion occurs on the outside of rivvers because of the forces of moving water push out or (erode) the landscape, to allow water the flow easier and create more room. the grouynd under the river will not erode because of the gravity and presure of the the water on the ground
erosion on a bank of a pond
The four types or mechanisms of erosion are rill erosion, gully erosion, stream bank erosion, and sheet erosion. In sheet erosion a thin layer of the surface is removed. In rill erosion, small rivulets of running water gather together and cut small channels. In gully erosion, rills enlarge to form bigger channels too large to be removed by normal tillage. Finally, streambank erosion is the washing away of soil from banks of streams and rivers. Erosion is a natural, continuous process, but agricultural practices can speed erosion, resulting in lost soil, lost soil fertility, air pollution, and water pollution. Wind and water are the main agents that move soil.
It changes because the force of the water and because the bank is loose and dry from the erosion. The bank will move which ever way the water is flowing.