Predicting Beach Erosion as a Function of Rising Water Level

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Abstract
A model has been constructed to predict the horizontal distance of shoreline recession that occurs when a beach and nearshore zone in dynamic equilibrium is subjected to a rise in water level. The horizontal distance of shoreline recession (X) is inversely proportioned to the angle of the nearshore slope seaward from breaking waves ( ), and directly proportioned to the rise in water level (a): The volume of sediment eroded from the beach is equal to the volume of sediment deposited in the nearshore up to and including the position where waves break: Xh = ab where h is the vertical distance from the foreshore crest to the foreshore base, and b is the distance from the foreshore base to the position of breaking waves.