Rivers and Coasts Assesment Flashcards
2 Types of erosion?
Attrition
Abrasion
What is Attrition?
Rocks bashing together to become smoother or smaller
What is Abrasion?
Rocks hurdled at the base of a cliff to break peices apart
Two hard engineering strategies?
Straightening channel
Deepening or widening river
Two soft engineering strategies?
Afforestation
Flood plain zoning
What is flood plain zoning?
Land is used to minimize flooding
How are spits formed?
Material moved along the coast via LSD
Coastline changes direction
Material doesn’t change direction
Material is deposited beyond a headland
Overtime the spit grows
Develops a hook.
How is a beach formed?
Deposition and sheltered areas
How is a river shaped in upper course?
Valley is V-shaped
Steep and narrow channel
Erosion
How is a river shaped in middle course?
Valley becomes wider and flat
Channel becomes wider and deeper
Erosion and Deposition
How is a river shaped in lower course?
Valley becomes flat and wide floodplain
Channel at its widest and deepest
Deposition dominates
Two types of transportation?
Solution
Suspension
What is solution?
Minerals dissolve in water
What is suspension?
Sediment is carried along the flow of water
