River processes

Deposition Deposition is the processes where material being transported by a river is deposited.

River deposition

This happens when a river loses energy. Corrosion is a special type of erosion that only affects certain types of rocks. They range in speed from rock falls to much slower soil creep. After a series of floods layers of sediment form along the flood plain. Solution is when dissolved material is carried by a river. In times of highest discharge, velocity increases, as does erosion. The material such as silts and clays is light and can be held in suspension. A greater velocity is required to erode material compared to just transporting it. River Processes by rgamesby Erosion - the wearing away of the land by moving forces - in this case the river. This could happen because of a lack of precipitation or an increase in evaporation. Transport - the movement of material, in this case by river water.

Deposition Deposition is the process of the eroded material being dropped. It shows the velocities at which sediment will normally be eroded, transported or deposited.

Capacity is the total load actually transported.

river landforms

Bedload: Can be either exogenetic or endogenetic, and moves by sliding, saltating, or rolling. Cavitation is an interesting method of erosion. The competence is the maximum size of load a river is able to carry whereas capacity is the total volume of material a river can transport.

The largest of particles such as boulders are transported by traction.

River processes and landforms

The video below shows transportation in a river in the form of traction, saltation and suspension. The mean settling velocity shows the minimum speed that particles of different sizes will be deposited by the river. A land slide happened in Jesmond Dene, Newcastle, in November Traction is when large materials such as boulders are rolled and pushed along the river bed by the force of the river. Increased human use abstraction of a river could also reduce its discharge forcing it deposit its load. Processes include; Solution - where material is dissolved within the water Suspension - where small particles are held up or suspended in the water Saltation - the bouncing motion of larger particles along the river bed Traction - the rolling motion of sediment along the bed - normally much larger sediment. This means that only a small decrease in velocity leads to sedimentation. This is where the load bounces along the bed of the river because the river has enough energy to lift the particles off the bed but the particles are too heavy to travel by suspension. This often happens in areas where the geology is limestone and is dissolved in slightly acidic water. You may have heard this called abrasion. It may be from outside the river exogenetic that includes, mass movement, rill and gully erosion and sheet wash. Deposition Deposition is the processes where material being transported by a river is deposited.

Deposition occurs when a river loses energy. When a river meets the sea a river will deposit its load because the gradient is generally reduced at sea level and the sea will absorb a lot of energy. More velocity is needed to pick up material than to carry it in suspension. This is where particles are dissolved into the water so only rocks that are soluble, such as limestone or chalk, can be transported in solution.

Transport - the movement of material, in this case by river water.

erosional work of river

Pure water is neutral and basically non-existent in nature.

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River Processes