| 研究生: |
周士傑 Chou, Shih-Chieh |
|---|---|
| 論文名稱: |
防砂壩潰壩後河床演變過程之實驗研究 Experiment Study of the riverbed variation after a check-dam failure |
| 指導教授: |
謝正倫
Shieh, Chjeng-Lun |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 水利及海洋工程學系 Department of Hydraulic & Ocean Engineering |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 81 |
| 中文關鍵詞: | 防砂壩 、潰壩 、土石流 、擴散方程式 |
| 外文關鍵詞: | check-dam, dam failure, debris flow, diffusion equation |
| 相關次數: | 點閱:100 下載:3 |
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為了解防砂壩潰壩後的河床的演變過程,本研究利用實驗進行研究,討論數種不同實驗條件下對於河床的變化情形,包括壩體高度、流量以及坡度等,再利用擴散方程式的理論,模擬各個實驗的理論河床,再加以分析其特性。在實驗的過程中,潰壩初期河床有較為激烈的變動,壩體上游劇烈沖刷及下游大量的淤積,透過泥砂移動層及全流動深度的分析比較後發現,在潰壩的初期,泥砂的運動主要為土石流形式,隨著時間的增加,逐漸轉變為不成熟土石流及一般的河道輸砂型態,這與擴散方程式理論較為不同,導致在坡度與淤積距離有些許差異;此外,在本研究的實驗與理論綜合分析成果包括坡度變化、角速度變化、侵蝕淤積距離以及轉折點等分析等,其中在坡度與角速度變化方面,潰壩初期坡度變化較為快速,隨著時間的逐漸減緩;侵蝕淤積距離方面觀察到時間與侵蝕淤積距離關係式;轉折點方面,實驗分析結果為位於壩體高度的0.3至0.35倍之間。最後對於潰壩後河床最初穩定坡度與潰壩前上游淤砂坡度及下游河床坡度進行分析,得知最初穩定坡度與潰壩前坡度有很高的相關性。
In order to understand riverbed evolution of check-dam failure, this study include experiment and theory. The experiment provide a detailed view of a phenomenon that include different experimental conditions such as different dam height, flow rate and channel slope, and then use diffusion equation to simulate the bed of the riverbed, coupled with analysis of its characteristics. During the dam failure process we observed evolution have a drastic change, the upstream has been erosion and downstream has been deposition, sediment transportation type by debris flow to general bed load. In addition, in this study focuses on the experimental and theoretical, including changes of slope, angle velocity, erosion and deposit distance and pivot point etc. In dam failure period, angle velocity and riverbed slope always vary especially dam-break occurrence, However, a pivot point of the riverbed was observed the dam-break wave cases of 0.3. Finally, the initially stable slope and the slope before the dam has a high correlation.
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