不同蜿蜓度對床形變動影響之試驗研究

The Bed Topography in Various Sinuosity of Meandering Channels

黃進坤(CHIN-KUN HUANG) ； 劉長齡(CHANG-LING LIU)

《台灣水利》 45卷2期 (1997/06) Pp. 13-21

摘要

本文利用十種蜿蜒度之動床試驗方法，對床形受蜿蜒度之影響加以探討。從試驗結果可以得知床形受蜿蜒度變化之影響極大，其中最大沖刷深度、最大相對沖刷深度及最大淤積高度均隨著蜿蜒度之增大而增加之趨勢，但於最大相對淤積高度影響則不顯著。另於最大沖刷及淤積之位置受蜿蜒度變化影響極為明顯，於最大蜿蜒偏角小於70度時，蜿蜒度愈大時兩者發生位置愈接近彎道頂點；大於70度後，最大沖刷點位於頂點上游，但最大淤積點則呈現較不規律之變化，且位於頂點下游。

關鍵字

蜿蜓度 ； 沖刷 ； 淤積

並列摘要

The bed form change due to sinuosity has been investigated. These studies are carried out by experiment using ten different sinuosities. The results show the bed form is strongly affected with sinuosity. The maximum scour depth, maximum relative scour depth and maximum deposition height increase with increasing sinuosity, not the maximum relative deposition height one. In addition, the positions of maximum scour and deposition are significantly affected with sinuosity. In the case of deflection angle smaller than 70°, both positions are near the apex of bend. While the deflection angle greater than 70°, the former one happens at the upstream of the apex, and the latter one showing irregularly change.

並列關鍵字

Sinuosity ； Scour ； Deposition