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

Hitoshi Murakami, Yoshihiko Hosoi

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.

Keywords


breakwater; permeable breakwater; diffusion; aeration

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