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中文摘要：
为了研究阶梯河道中的山区洪水波运动特性,在阶梯坡面上分别进行了无加糙和用粘贴不同粒径的均匀沙定床加糙的2组系列试验。试验结果表明：阶梯坡面末端无量纲波前速度趋近于常数,其大小不仅随相对阶梯高度h＊增加而减小,亦随相对粗糙高度ks增加而减小。此外,床面粗糙程度较小时h＊的增大会导致山洪行进时间增加及水流能量消耗的增大;床面大粗糙度不仅对山洪行进具有阻碍作用,而且能很大程度上消耗水流能量。研究结果对山区河道中山洪防治提供了参考。
英文摘要：
An experiment was conducted to investigate surging waters down a stepped channel,which was 2.4 m long,0.5 m wide and with a slope of 0.133,for the cases of being roughed and non-roughed.The results showed that at the end of the channel,the dimensionless wave front celerity tends to be constant and its magnitude decreases with the increase of the relative step height h＊ and the relative roughness height ks.In addition,for small bed roughness the increase of the relative step height h＊ will result in the delay of flash flood propagation and increase of energy dissipation to a certain extend.Large bed roughness will not only severely postpone the flash flood propagation,but also greatly enhance the energy dissipation of the flow.The results of the study may provide some advices on the flash flood defense during the reconstruction in the earthquake-hit area.
同期刊论文项目
同项目期刊论文
Analysis of Runoff in Ungauged Mountain Watersheds in Sichuan, China using Kinematic-wave-based GIUH
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