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題名 | 暴風型海灘平衡剖面預測模式=A Model for Predicting Equilibrium Storm Beach Profiles |
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作者 | 許泰文; 廖建明; 林政毅; | 書刊名 | 中國土木水利工程學刊 |
卷期 | 10:2 1998.06[民87.06] |
頁次 | 頁271-278 |
分類號 | 443.1 |
關鍵詞 | 暴風海灘; 海灘斷面; 形狀函數; Storm beach; Beach profile; Shape function; |
語文 | 中文(Chinese) |
中文摘要 | 一般平衡海灘斷面形狀依其性質可分為暴風海灘及正常海灘。暴風海灘呈侵蝕狀, 灘線向內陸移動,於遠灘區產生沿岸沙洲,其斷面形狀呈現近灘凹陷而遠灘凸起之變化趨勢。 前人建議之海灘斷面形狀函數,均為單調遞減函數,不足以描述其斷面變化的主要特徵。文 中先利用實驗室及現場實測海灘斷面資料,由迴歸分析找出適當的形狀函數,結果顯示五次 多項式能合理地描述暴風型海灘斷面之幾何形狀。本文再從能量消散模式探討暴風型海灘之 幾何特性與影響因素之關係,據此建立暴風型海灘之預測模式,模式預測結果經與實測斷面 比較,呈合理之一致性。 |
英文摘要 | The shape of an equilibrium beach profile can be qualitatively decomposed into the storm profile and normal profile. The storm profile is erosional and can result in recession of the shoreline by which the eroded material from the beach may be deposited as longshore bars offshore. The geometry of this profile comprises a convex downward curve nearshore and a concave upward curve offshore. Previous proposed shape functions are monotonous decreasing functions which cannot properly describe the configuration of the storm profile. In this paper this beach profile data from laboratory and field survey are used to establish the most reliable shape functions by regression analysis. The results show that a 5th polynomial is capable of simulating the geometric configuration of the storm beach profile. A general function relating the various geometric characteristic of a storm profile to forcing parameters is obtained considering the property of wave dissipation. The model has been developed for describing the shape of a storm profile. The prediction has been compared favorably with laboratory beach profiles. |
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