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| 題 名 | 防淤隧道排砂效率的動床試驗分析=Investigating Sediment Desilting Efficiency of Desilting Tunnel under Mobile Bed Condition Using Physical Modeling |
|---|---|
| 作 者 | 李豐佐; 賴進松; 凃秀錦; 廖哲民; 陳秀娟; | 書刊名 | 臺灣水利 |
| 卷 期 | 72:3=287 2024.09[民113.09] |
| 頁 次 | 頁1-16 |
| 分類號 | 443.64 |
| 關鍵詞 | 防淤隧道; 水文情境; 排砂效率; Desilting tunnel; Hydrological condition; Desilting efficiency; |
| 語 文 | 中文(Chinese) |
| DOI | 10.6937/TWC.202409_72(3).0001 |
| 中文摘要 | 霧社水庫位於南投縣仁愛鄉,於48年完工,壩高114公尺,壩頂總長205公尺,滿水位高程EL. 1,005公尺,主要設施有大壩、溢洪道、放水口、進水口、排洪隧道等,至2021年,水庫淤積率約為75.22%,壩前淤積高程EL. 977.52公尺。為因應防淤,防淤隧道建設至關重要,需考量排砂效益、施工可行性及長期運營。本研究以1/40等比模型模擬水文變化對排砂效率影響,試驗情境包括Q₂、Q₁₀、Q₅₀洪水情境,初始水位設定為1,002公尺,探討不同水文情境下防淤隧道排砂效率。試驗成果顯示Q₂排砂效率約17.54%,Q₁₀約26.09%,Q₅₀約33.96%。庫區沖刷行為主要集中於右岸,且隨入流減少,左右岸泥砂濃度差異減小,庫區泥砂開始落淤,但受入流流量逐漸增加影響,泥砂運移時間縮短,入庫渾水受庫區初始清水稀釋之影響亦隨之變小。動床鋪設範圍內沖刷深度最大約2公尺,防淤隧道入口流場影響沖淤範圍約40公尺。綜合試驗結果,防淤隧道興建後,水庫整體排砂效率介於17.54%至40.63%之間,總排砂量約9.52至126.26萬噸。 |
| 英文摘要 | The Wushe Reservoir, located in Ren'ai Township, Nantou County, was completed in the 48th year. It stands at a height of 114 meters with a total length of 205 meters and a full water level elevation of 1,005 meters. Its main facilities include a dam, spillway, inlet and outlet, and sediment flushing tunnel. As of 2021, the reservoir's sedimentation rate is approximately 75.22%, with sediment accumulation reaching an elevation of 977.52 meters in front of the dam. In response to sedimentation, the construction of sediment desilting tunnels is crucial, considering sediment desilting efficiency, construction feasibility, and long-term operation. This study utilized a 1/40 scale model to simulate the influence of hydrological changes on sediment desilting efficiency. Experiment scenarios encompassed Q₂, Q₁₀, and Q₅₀ flood situations, with an initial water level set at 1,002 meters, investigating the sediment desilting efficiency of the desilting tunnel under different hydrological conditions. Results indicated sediment desilting efficiencies of approximately 17.54% for Q₂, 26.09% for Q₁₀, and 33.96% for Q₅₀. Sediment erosion in the reservoir mainly occurred on the right bank, with decreasing differences in sediment concentration between the left and right banks as inflow decreased. Sediment deposition within the reservoir began as inflow reduced, but the impact of hydrological conditions led to shorter sediment transport times and reduced dilution of inflowing turbid water by initial clear water in the reservoir. Maximum erosion depth within the bed-load laying area was approximately 2 meters, and the influence of the flow field at the entrance of the desilting tunnel extended to about 40 meters. Overall, after the construction of the desilting tunnel, the reservoir's sediment desilting efficiency ranged from 17.54% to 40.63%, with a total sediment desilting volume of approximately 9.52 to 126.26 ten thousand tons. |
本系統中英文摘要資訊取自各篇刊載內容。