Keywords Flashcards
Abrasion
Rocks carried along by the river that wear down the river bed and banks
Attrition
Rocks being carried by the river smash together and break into smaller,smoother round particles
Cross Profile
The side to side cross-section of a river channel and/or valley.
Dam
A barrier (made on earth, concrete or stone) built across a valley to interrupt river flow and create a man made lake (reservoir) which stores water and controls the discharge of the river.
Discharge
The quantity of water that passes a given point on a stream or river-bank within a given period of time.
Embankments
Raised banks constructed along the river; they effectively make the river deeper so it can hold more wat
They are expensive and do not look natural but they do protect the land around them.
Estuary
The tidal mouth of a river where it meets the sea; wide banks of deposited mud are exposed at low tide.
Flood
Occurs when river discharge exceeds river channel capacity and water spills out of the channel onto the floodplain and other areas.
Floodplain
The relatively flat area forming the valley floor on either side of a river channel, which is sometimes flooded.
Flood Relief Channel
Building new artificial channels which are used when a river is close to maximum discharge. They take the pressure off the main channels when floods are likely, therefore reducing flood risk.
Floodplain Zoning
This attempts to organise the flood defences in such a way that land that is near the river and often floor not built on. This could be used for pastoral farming, playing fields etc. The areas that rarely get flooded would therefore be used for houses, transport and industry.
Flood Risk
The predicted frequency of floods in an area
Flood Warning
Providing reliable advance information about possible flooding. Flood warning systems give people time remove possessions and evacuate areas.
Fluvial Processes
Processes relating to erosion, transport and deposition by a river
Gorge
A narrow, steep sided valley, often formed as a waterfall retreats upstream