Discussion
Consider the following statements about the Bruun rule.
1. It predicts retreat proportional to the rise divided by the profile slope.
2. It assumes a closed sediment budget and an equilibrium profile.
3. It accounts fully for longshore transport and sediment supply.
Answer: D
The first two are correct and include the assumptions on which it rests. The third is exactly what it does not do, and this is the principal ground on which it is criticised. A closed budget is rarely a realistic assumption.
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