Expression for Shoreline Advancement of Initially Plane Beach

Abstract

A semiempirical model for the prediction of shoreline advancement/recession of an initially plane beach is developed by using a conservation of sand argument and extending the equilibrium profile concept of Bruun and Dean in the surf zone to the depth of closure. When the initial each slope is greater than 1.2 times of the equilibrium slope, me=hc/Wc, where hc is the depth of profile closure and Wc is the offshore distance to hc, the shoreline recession occurs, or vice versa. Using regression analyses on some available laboratory data, the magnitude of shoreline advancement is expressed in terms of initial plane beach slope, deepwater wave height and the Dean number. This expression is shown to give a good agreement with some field measurement data when the nearshore storm wave height that is exceeded only 12 hr/yr is used in place of the deepwater wave height.