Discussion
Assertion (A): Coarser sediment gives a steeper equilibrium profile.
Reason (R): The profile coefficient increases with the fall velocity of the grains.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. In the equilibrium profile the shape parameter increases with the sediment fall velocity, and coarser grains fall faster, so a shingle beach stands far steeper than a fine sand one. The practical consequence is that a nourishment using coarser material than the native beach will build a steeper profile and appear to lose volume as it adjusts.
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