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題 名 | 河口三角洲發展過程之實驗研究=Experimental Studies on the Formation Process of River Deltas |
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作 者 | 謝正倫; 曾志民; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 9:2 1997.06[民86.06] |
頁 次 | 頁343-350 |
分類號 | 351.8 |
關鍵詞 | 河口三角洲; 形態函數; 渠流; River deltas; Shape function; Stream channels; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用一系列室內動床實驗及理論討討河口三角洲之發展過程及幾何相似特 性。實驗結果顯示三角洲之發展過程可區分為三個階段。在第一階段中,三角洲主要在長度 方向發展,呈現狹長之形狀特性,本研究利用流速分佈特性,推求底床剪應力分佈以探討第 一階段三角洲之淤積長度。在第二階段中,三角洲主要在寬度方向發展,由幾何相似性分析 結果顯示河口三角洲之無因次平面形狀及無因次橫斷面形狀分別具有明確之高斯函數及雙曲 函數特性。在第三階段中,本研究利用三角洲中心軸最大淤砂坡度與渠道平均淤砂波度之比 值來探討三角洲面上自發性渠流的發生條件及擺動過程。 |
英文摘要 | A series of movable bed experiments were conducted to study the format ion process and geometric similarity of river deltas. The exper-imental results show that the development of the delta can be divided into three stages. First, the delta moves mainly in its length. An equa-tion derived by this study is successfully applied to describe the length of the delta in the first stage. Second, the delta develops mainly in its width. The characteristic parameters such as the length, width and central thickness of the delta are adopted to analyze the geometric sim-ilarity of delta morphology in the second stage. The results indicate that the plane and cross section shapes of the delta can be described by a Gaussian and a hyperbolic function, respectively. In the third st age, some self-formed stream channels are found on the delta. The occurrence con ditions and variations of stream channel are discussed. |
本系統中英文摘要資訊取自各篇刊載內容。