True ,seawalls are constructed perpendicular to the shore to prevent wave erosion.
What is wave erosion ?
Waves may erode beaches on a variety of geographical and temporal dimensions. A scour zone moves up the beach or down the beach with every rise and fall in the tide. At the tide level, there is a turbulence zone where suspension of sediment is common. It is also the zone where the backwash meets the oncoming surge.
The erosion occurs between three percent and forty percent of the breaker height and deeper. As the tides vary, the breaker zone likewise moves down the beach. Sediment migration in the foreshore-inshore region is highest within the breaking zone. In actuality, the breaker zone is where nearly 50% of the sediment flow occurs.
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