Last updated on August 2, Rivers have a lot of energy and because they have energy, they do stuff. The obvious things rivers do with their energy is flow but, besides this, they also transport load, erode load and erode the channel through which they flow. Erosion Erosion is the breaking down of material by an agent.
Chemical Action Corrosion - Water dissolves minerals from the rocks and washes them away. Levees A levee is a feature of river deposition. It is a wide, low ridge of sediment deposited on the river banks.
Levees are generally found in the mature and old age stages of a river.
As rivers enter the middle and lower course they have a lower velocity due to the gentle slope of these stages. After heavy rain the river may overflow its banks and flood the surrounding land.
The flooded land either side of the river is known as the flood plain. The floodwaters deposit a fertile layer of fine sands and silts called alluvium.
The heaviest material is dropped first closest to the river side due to weight and friction between the water and land and the lighter material is carried further by the floodwaters. Eventually ridges of material may build up on both banks.
These ridges are known as levees. Humans often build artificial levees or strengthen existing ones to prevent further flooding of towns and farmlands. Examples of levees include: The less obvious indirect effects of point and reach changes occurring downstream and throughout the basin, however, are much more recently appreciated.
These are complemented by effects of alterations of land use, such as deforestation, intensive agriculture and incidence of fire, with the most extreme effects produced by building activity and urbanisation. When considering the human role in relation to changing river channels, at least five challenges persist.
First, because prediction of the nature and amount of likely change at a particular location is not certain, and because the contrasting responses of humid and arid systems needs to be considered, modelling is required to reduce uncertainty.
Second, feedback effects incorporated within the relationship between changes at channel, reach and network scales can have considerable implications, especially because changes now evident may have occurred, or have been initiated, under different environmental conditions.
Stream-related processes are called fluvial (from the Latin word fluvius = river). Water dislodges, dissolves, or removes surface material in the process called erosion. Streams produce fluvial erosion, in which weathered sediment is picked up for transport, and movement to new locations. Sediments are laid down by another process, deposition. River Processes: erosion, transportation and deposition & the Hjulström Curve. There are three main types of processes that occur in a river. In the case of a river, the agent is water. The water can erode the river’s channel and the river’s load. A river’s load is bits of eroded material, generally rocks, that the river transports until it deposits its load. A river’s channel is eroded laterally and vertically making the channel wider and deeper.
Third, consideration of global climate change is imperative when considering channel sensitivity and responses to threshold conditions. Fourth, channel design involving geomorphology should now be an integral part of restoration procedures. This requires, fifthly, greater awareness of different cultures as a basis for understanding constraints imposed by legislative frameworks.
Better understanding of the ways in which the perception of the human role in changing river channels varies with culture as well as varying over time should enhance application of design for river channel landscapes.Stream-related processes are called fluvial (from the Latin word fluvius = river).
Water dislodges, dissolves, or removes surface material in the process called erosion. Streams produce fluvial erosion, in which weathered sediment is picked up for transport, and movement to new locations.
Sediments are laid down by another process, deposition. - A Study of the Changes in River Processes This is a study of the changes in river processes along the long profile of a river. To study this we will use a sample river. The river the study will be based on Loughton Brook, which is a river situated in Epping Forest in Essex and is .
At the beginning of The River, Brian Robeson opens his front door to three men. They ask if he is the Brian Robeson who survived for fifty-four days alone in the . When a river reaches a lake or the sea the water slows down and loses the power to carry sediment. The sediment is dropped at the mouth of the river.
The sediment is dropped at the mouth of the river. The River Processes at Dovedale Essay Sample. Now that I have finished carrying out my investigations both on river processes at Dovedale and the tourist pressure which occurs in a honeypot in Castleton, I have now finally reached a conclusion based on my findings of each experiment.
G.C.S.E. Geographical Investigation Landforms, Processes and Tourism in a River Valley: Dovedale, Derbyshire. We can write a custom essay According to Your Specific Requirements.