Corrosion is a special type of erosion that only affects certain types of rocks. Faster-flowing, turbulent rivers carry more suspended material. The division between Transportation and deposition is small.

Vertical erosion makes a river channel deeper.

This type of erosion is strongest at rapids and waterfalls where the water has a high velocity. Velocities slow because the river might widen and become shallower, increasing the friction between the water and the river bed, or variations in channel shape leave some parts shallower and therefore slower than others. River Profiles. •Erosion •Transportation •Deposition 2. There are several different ways that a river erodes its bed and banks.

These are: (adsbygoogle = window.adsbygoogle || []).push({}); Hydraulic action.

Processes of Erosion Erosion is the breaking down of material by an agent. The water can erode the river’s channel and the river’s load. as bedload or in suspension). Home Economics: Food and Nutrition (CCEA).

Find out about the characteristics of the drainage basing hydrological cycle. To do this, A river entering the sea or a lake, reducing velocity, River overflows its banks, depositing material on the flood plain.

A river can lose its energy when rainfall reduces, evaporation increases, friction close to river banks and shallow areas which leads to the speed of the river reducing and therefore the energy reduces, when a river has to slow down it reduces its speed (and ability to transport material) and when a river meets the sea.

In the case of a river, the agent is water.

Different processes create different river landforms. This is held in solution and can come from erosion, pollution, mineral springs and chemical weathering. A river’s channel is eroded laterally and vertically making the channel wider and deeper. Corrosion is highly effective if the rock type of the channel is chalk or limestone (anything containing calcium carbonate) otherwise, it doesn’t have much of an effect.
Moving from the upper course to the lower course, the rates of erosion, transportation and deposition change.

(adsbygoogle = window.adsbygoogle || []).push({}); Corrosion / Solution. If the river’s discharge is reduced then the river will lose energy because it isn’t flowing as quickly anymore.

The relationship between the size of particles (competence) and water velocity is shown on the graph below: This is carried with the body of the current. The characteristics of a river channel change along its long profile. Lateral erosion makes a river wider.

Air becomes compressed, pressure increased and the riverbank may, in time collapse. Erosion, deposition and materials rivers carry all contribute to how rivers shape surrounding land. As a river flows along its course it undertakes 3 main processes which together help to shape the river channel and the surrounding valley. Water, being ever so slightly acidic2, will react with certain rocks and dissolve them. These bubbles eventually implode creating a small shockwave that weakens the rocks. Boulders collide with one another as they move down the river, and can break into smaller pieces. Traction is when large materials such as boulders are rolled and pushed along the river bed by the force of the river. Most of a river’s load is transported by suspension. Near waterfalls and rapids, the force may be strong enough to work on lines of weakness in joints and bedding planes until they are eroded. 3. It is intended primarily for undergraduate students interested in fluvial studies as part of physical geography, earth sciences, environmental sciences and ecology courses.

Only experienced in times of great flood.

The energy in a river causes erosion.

Critical erosion velocity (the Hjulstrom curve).

Material that has been loosened by erosion may be then transported along the river. The first is that clay sized particles don’t appear to have a mean settling velocity. Why do people choose to live in tectonically active locations? There are many processes operating in different parts of rivers. River processes 1. Preview. Attrition - where stones in transport are thrown into one another.

Transport is the movement of material, in this case by river water. By Alex Jackson .

Application to the Hjulstrom Curve. Attrition makes the particles of rock smaller.

•Erosion •Transportation •Deposition 2. Rivers either transport, erode, or deposit sediment (load).

The material such as silts and clays is light and can be held in suspension. **River Processes: Erosion, Transportation, Deposition. It is a minor process except in areas of limestone. River Processes . The start of a river is called the Source and the end is called the Mouth. Sediment in a river comes from a variety of sources. 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. The edges of these rocks become smoother and more rounded. Last updated on August 2, 2014. - rocks being carried by the river smash together and break into smaller, smoother and rounder particles.

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