A Study on Design Criteria of Detached Breakwaters (II)

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基本資料

Project title

Code/計畫編號

90農科-1.4.5-漁-F4(4)

Translated Name/計畫中文名

離岸防波堤設計準則研析 (II)

Funding Organization/主管機關

Council of Agriculture,Executive Yuan

Co-Investigator(s)/共同執行人

岳景雲(計畫主持人)

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=1046407

Year

2001

Start date/計畫起

01-01-2001

Expected Completion/計畫迄

31-12-2001

Co-Investigator(s)

Deng-How Tsaur

Bugetid/研究經費

600千元

ResearchField/研究領域

土木水利工程

本計畫是以複合邊界元素法解析在等水深海域, 波浪通過任意形狀港池前設置離岸堤所產生繞射問題.當入射波之波長遠大於離岸堤之厚度時, 離岸堤可視為薄板結構物時, 採用本計畫數值方法亦可得到相當好的結果, 由數值模式驗證例與過去學者理論值或試驗資料作比較均有良好的正確性, 說明了本模式為一可行方法.最後, 本計畫探討離岸堤長度、厚度、距離改變時對港池內外波高分佈之影響.本計畫主要分析在漁港外廓構築一離岸堤, 可藉由堤的遮蔽效應, 使得大部分波浪被反射, 一部份波浪經由繞射而向港內傳遞, 其遮蔽區的波高會較無離岸堤時波浪長驅直入港內的波高為小, 因此不但可以提高港內靜穩度, 而且改變港口流的方向, 不佔據泊地面積, 不影響迴船池面積, 增加漁船航道出入口, 且比傳統外廓防波堤建設經費較為節省.目前台灣漁港有關離岸防波堤較缺少完整的設計準則可以作為遵循, 值得做進一步的研究. Wave-induced oscillations in a arbitrary shape harbor of constant water depth by a detached breakwater is investigated by composite boundary element method.The length of the incident wave was assumed to be significant longer than the thickness of the offshore breakwater so that the thickness could be neglected and the breakwater regarded as a thin barrier.Special solutions using the method of composite Boundary Element Method for the thin offshore breakwaters are also obtained.The accuracy of the present model is verified by comparison with existing results.Finally, the diffraction coefficients for a rectangular harbor of offshore breakwater are evaluated as illustrations.The main purpose of this project is to study on design criteria of detached breakwaters.

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A Study on Design Criteria of Detached Breakwaters (II)

基本資料

Description