頁籤選單縮合
題 名 | 隔板對泥砂導流及局部沖刷之試驗研究=Experimental Study on Panel Effect to Sand Motion and Local Scouring |
---|---|
作 者 | 劉長齡; 黃進坤; 邱銘鴻; | 書刊名 | 臺灣水利 |
卷 期 | 47:1=185 1999.03[民88.03] |
頁 次 | 頁1-7 |
分類號 | 443.97 |
關鍵詞 | 隔板; 泥砂導流; 局部沖刷; Panel; Sand controlled; Local scouring; |
語 文 | 中文(Chinese) |
中文摘要 | 本試驗主要目的,在了解導水型隔板對泥砂導流特性及本身所產生局部沖刷坑之 探討。 試驗結果顯示,在於相同方向之水流攻角下,表層導流式隔板不論其入水深度,甚 至深入底床,其泥砂導流方向都是一樣。 面底部導流式隔板約於突出河床高度為 0.5 倍水 深時,其對泥砂導流方向互異,形成一分界點,亦即造成沖淤現象正好相反。中間導流式隔 板,當其隔板下部緊貼底床時,與底部導流式隔板相同,隔板高度約在 0.5 倍水深時, 泥 砂導流仍有互異的情形發生。在於相同方向之水流攻角下,底部導流式隔板突出河床高度大 於 0.5 倍水深時,其造成之沖淤現象和表層式隔板一樣。 表層導流式隔板下部允許水流通 過,其向下水流通過隔板下部,並於其後方下游處造成局部沖刷坑; 而底部導流式隔板則沖 刷坑產生於近隔板之上游處。 |
英文摘要 | The aim of this study is undertaken to know the directions of sand motion and the positions of local scouring due to the effect of different flow-training panels. It is known byexperiments that the sand motion is caused by helix in a clockwise direction of the angle of attack is smaller than w/2, no matter how large the opening of the surface panel. The bottom panels have a critical height about 0.5 times local water depth at design stage. Inother words, the panel's height is above or under the critical depth of bottom panels, while the sand-training is quite different. The middle panels, not close to the surface and the bottom, only in the case the panel's bottom is close to the river bed have the nearby phenomenon of depositing and scouring with the bottom panels. In the same angle of attack with flow, the bottom panels with the height greater than half local water depth at design stage have the same phenomenon of depositing and scouring with the surface panels. The open space under the surfac panel allows the flow passing, then the local scour will take place at downstream, but the bottom panel has the local scour at upstream nearby. |
本系統中英文摘要資訊取自各篇刊載內容。