頁籤選單縮合
題 名 | 梳子壩下游沖刷坑之試驗研究=A Study on Downstream Bed Scouring Pit of the Slit-Type Dam |
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作 者 | 林信宏; 方光宇; 段錦浩; | 書刊名 | 水土保持學報 |
卷 期 | 32:2 2000.06[民89.06] |
頁 次 | 頁69-78 |
分類號 | 443.92 |
關鍵詞 | 狹縫密度; 相對開口寬度; 泥砂體積濃度折減效率; Slit density; Relative opening width; Ratio grain concentration by volume; |
語 文 | 中文(Chinese) |
中文摘要 | 在過去對梳子壩之研究主要在針對梳子壩狹縫密度、相對開口寬度(b/dmax)等對土石流之貯砂效率、泥砂體積濃度折減效率等影響,且沖刷坑之研究亦以傳統防砂壩及開口式滯洪壩為主,並無針對梳子壩下游沖刷坑之試驗研究,故本文利用渠槽試驗以三種流量、三種坡度及7種狹縫密度來探討梳子壩之下游沖刷坑之型態。 經試驗結果顯示,在相同狹縫密度下,渠槽坡度及流量增加時,沖刷坑各因子會隨之增加,但在相同渠槽坡度及流量下,沖刷坑各因子並不曾因狹縫密度減少而增加,成不規則變化;梳子壩之狹縫密度愈大時。下游各沖刷坑彼此之間愈獨立且沖刷坑各因子最大值發生位置集中在渠槽之中間。但在狹縫密度愈小時,則反之,成一均長之條狀沖刷坑且沖刷坑各因子最大值發生位置並不固定。 |
英文摘要 | In the past, studies of the slit-type dam mainly focused on the trap efficiency of the debrisflow and the ratio grain concentration by volume, which are influenced by factors such as the slitdensity of the slit-type dam, and the relative opening width (b/d ma,). Studies of the scouring hole,concentrated on the traditional check dam and the flood detention dam. Few studies payattention to the downstream scouring hole of the slit-type dam. This study use results fromindoor flume experiment to discuss the types of the downstream scouring hole resulting from threedifferent discharges, three different slopes of channel, and seven kinds of slit density. The results indicate that with the increase of the discharge and the slope of channel, the factors of the scouring hole consequently increase. However, with the same slope and the samedischarge, the factors of the scouring hole don't increase although the slit density decreases. Theinterrelationship between them shows irregular changes. Furthermore, the heavier the slit densityof the slit-type dam, the more independent between each down-stream scouring hole, and themaximum of the factors of the scouring hole occurs mainly in the center of the channel. But as theslit density becomes smaller, the situations reverse. The scouring hole forms a uniformly narrowlong strip type, and the location, which the maximum of the factors occurs, is not certain. |
本系統中英文摘要資訊取自各篇刊載內容。