CHARACTERISTICS OF DIFFUSION AND AERATION DUE TO WAVE ACTION NEAR PERMEABLE BREAKWATERS

Abstract

This paper deals with the effect of wave action on the water purification near a permeable breakwater. When determining standards for water purification, three indexes are usually taken into account: the diffusion coefficient, the concentration reflection ratio and the reaeration coefficient. In our study, the values of the diffusion coefficients Kx near —12 2 the breakwater ranged from about 10 cm /sec to 7x10cm /sec. The effect of aeration caused by setting up a permeable breakwater was limited to within a distance of only one wave length at either side of the breakwater. As a result, values of the reaeration coefficients were then estimated to be in the order of 10 - 10 /sec.