Analysis of Bayed Beaches in Static Equilibrium

Abstract

A bayed beach in equilibrium could be in a state of either dynamic or static equilibrium; the latter being a special case of the former when the absolute quantity of longshore transport is nil. As a bay approaches its equilibrium shape, the net sediment‐transport rate in the bay decreases and eventually ceases. The writers carried out a series of model beach studies to investigate the planform of crenulate‐shaped bays in static equilibrium. By adopting the method of measurement proposed by Hsu and Evans in 1989, the writers found that the effects of beach materials, wave characteristics (other than wave approach), and location and spacing of breakwaters need not be considered separately. In further consideration of the tangent of the bay planform at the downcoast control point, the writers found that a second‐order polynomial equation of