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Computational Method for Rate of Overtopping Using Time Dependent Mild-Slope Equation  

Kwak, Moon-Su (Dept. of Civil Engineering, Myongji College)
Lee, Hong-Gyu (Division of Harbor Engineering, Hanah Engineering Co.)
Park, Sung-Yoon (Dealim Industrial Co. Ltd.)
Pyun, Chong-Kun (Department of Civil and Environmental Engineering, Myongji University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.18, no.4, 2006 , pp. 372-382 More about this Journal
Abstract
Most of the conventional breakwaters impermeable breakwaters which block seawater exchange between the outside and inside of the harbors. The blocking of seawater exchange may cause pollution of water in harbors. To solve the water pollution problem, various kinds of seawater exchange breakwaters have been proposed. Their types can be classified into the current type which uses tidal current, and the overtopping type which uses the wave energy. The overtopping type breakwaters require a discharge coefficient to calculate the rate of overtopping into the harbor. The present study is to compute the rate of overtopping with introduction of a correct discharge coefficient and to evaluate the effect of the overtopping type breakwater on the water qualify inside a harbor. The rate of overtopping was computed by using Forchheimer formula with time dependent mild-slope equation for various wave conditions. The formula has been generally used to calculate the overflow discharge in steady state river flows. The discharge coefficient, which is the key parameter of the calculation, was determined by a series of hydraulic model tests. The present scheme was applied to the seawater exchange section of the western breakwater of Jeju New Harbor's and the efficiency of that section was examined. The calculated results showed that the rate of overtopping into the harbor reached about $27.5m^3/s$ in the wave condition (wave height 3.7 m, wave period 8.5s, and wave direction NNW).
Keywords
seawater exchange breakwater; rate of overtopping; Forchheimer formula; discharge coefficient;
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