| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 94 === The purpose of this study is to simulation flow field of different seawall with numerical method. And we got better effect of wind reduction by improving the shape of stepped seawall. To ensure the accuracy of the numerical simulation in this study, the wind tunnel experiment is used as a method of testing and verifying the differences in numerical simulation. In each case, the width of the top seawall and the height of seawall and the slope of back seawall is fixed to 3.0m、6.0m and 1：1. We have simulated the different cases with the Reynolds number (4.7×104), the ratio of the boundary layer(8.33H) and the n of the Power Law (0.107). After handling and analyzing the data of the test with the software Tecplot, Autocad and Grapher, we then prove the mode is useable by confirming and verifying the results.
The conclusions drawn are as follows：
1.In this study, the slope of the multi-seawalls is to mild too have the worst distance of protection and protection index.
2.The ameliorate seawall has the best distance of protection(12.3H). The second is stepped seawall (11.5H). The third is retaining seawall (10.8H).
3.The retaining seawall has best P.I. (67.10H2). The second is stepped seawall (58.89H2). And the third is ameliorate (57.83H2).
4.The size of reverse of flow is affected by the drag coefficient. A greater drag coefficient lead to thin and long reverse of flow；otherwise, the reverse of flow is thickness and short.
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