系列潛堤工法應用於海岸保護之可行性分析

Abstract

本文應用Hsu等人(2003)所提出之EEMSE數值模式，探討波浪通過平面系列潛堤所產生的布拉格共振(Bragg resonace)效應，從數值計算結果分析系列潛堤共振效應和影響參數之關係，並據此選擇適當海域作為設計基地，進一步評估該工法之可行性。文中以新竹港南海域爲例，利用數值模式進行波場模擬，以遮蔽效益參數評估佈置系列潛堤後的消波效果。本文同時以該佈置方案爲例估算建構所需之材料成本，綜合歸納系列潛堤工法之優缺點，藉以說明其於海岸保護上之適用範圍。In this paper, the Bragg scattering for water waves propagating over a series of submerged breakwaters is investigated. Numerical schemes used in this study is based on the Evolution Equation of Mild-Slope Equation (EEMSE) developed by Hsu et al. (2003). Effective sheltering parameter is presented to assess the effect of wave reduction reflection for a series of submerged breakwaters. HsinChu Gangnan Coast using the numerical approach and the project cost an example of application is focused on estimate is also present for a series of submerged breakwaters. Finally, the advantages and disadvantages of using a series of submerged breakwaters are then compared. The results can help serve as an appropriate choice in favor of a series of submerged breakwaters for practical design.