Interpret Data Flashcards
Why does bedload size decrease in size downstream?
Erosion processes
Attrition and Abrasion
What erosion process is when pebbles collide with one another in the river channel and pieces of rock beak off?
Attrition
What erosion process is when the load scrapes against the river bank?
Abrasion
Why does discharge increase as the river flows downstream and what does this do to the power of the erosion?
More tributaries join the main channel which increases the power of erosion.
At site 2, what did the Colin Glen Trust line the bed and banks with and what did this speed up and increase?
Lined with granite slabs
Speeds up velocity of the river and increases it’s eroding power
Due to an increase in the rivers eroding power as a result of the granite slabs, what does this mean for the bedload shape and size compared to if it happened naturally?
Makes it more smaller and rounded than would have happened naturally
Why does river discharge increase downstream?
Discharge increases as more tributaries and surface run off join the main channel
What does the water have after the more tributaries are added to the main channel and what does this mean for the flow of the river?
Large volume which has more energy and can flow faster
What type of erosion is the sheer force of the river water hitting against bed and banks which removes material?
Hydraulic Action
Why was the velocity at site 3 faster? (Manual/Manmade) And what did this increase?
It had been straightened in order to protect a bridge and pathways which increased the flow.
What man made object greatly reduced friction and increased flow?
Granite slabs on the river bed
What 2 forms of erosion affect the velocity of the river?
Abrasion + hydraulic action
What 2 forms of erosion affect the average bed load size of a river?
Attrition and Abraision
