Why does the pebble size on a shingle beach climax at the top of the ridge then start to decrease?

Question

Theoretical explanations, perhaps to do with the type of wave (constructive)?

Answer 1

Because the waves as they come in throw the smaller pebbles further in.

In the same way that if you throw pebbles the smaller ones go the furthest distance.

Answer 2

Because it does

Answer 3

I think its because the breaking waves grind down the small stones (at the bottom of the ridge) but they cant reach the ones at the top so therefore they havent been worn down. Hope this helps a little!

Answer 4

Energy involved in wave movement. Exhaust at the top, reduction in energy on the return so that only the smaller stuff gets dragged down.

Answer 5

Robert and Podge have the right of it. The heavy particles - big rocks and the like - sink faster. Lighter stuff floats longer, and so makes it farther out to sea before it settles out.