Experimental study on scour and erosion of blocked dam
Authors：Jing ZHANG, Zhi-xue GUO, Shu-you CAO, Feng-guang YANG
Department: State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, P. R. China
Journal：Water Science and Engineering,2012,5(2):219-229
Date：30 June 2012
Page number：219-229
Key words：dam break; overtopping; headcut migration; sediment transport
Abstract：
This paper presents new experimental data of the erosion rate and sediment transport rate during the processes of dam break caused by overtopping. In order to study the headcut migration, the erosion coefficient was calculated and its peak value was determined near the downstream edge of the dam crest. Then the characteristics of vertical erosion during dam break processes were analyzed by dividing the dam into three regions: the upstream region, middle region, and downstream region. The three regions show different features during headcut migration, but all are exposed to the most intense erosion at the third stage of the dam break process. Finally, three relevant parameters affecting sediment transport were discussed: the length of the dam crest, the inner slope, and the dam composition. The results show that a longer dam crest and flatter inner slope reduce the peak sediment transport rate and prolong the arrival time of peak sediment transport rate; and with the increase of the non-uniformity coefficient S, the peak sediment transport rate initially increases, and then decreases.
Attachment：Experimental study on scour and erosion of blocked dam

《水科学与水工程杂志》刊登“有关挡水坝冲刷和侵蚀的试验研究”
作者: Jing ZHANG, Zhi-xue GUO, Shu-you CAO, Feng-guang YANG
刊物：水科学与水工程杂志
期刊号：5（2）
时间：2012年6月30号
页码：219-229
关键词：溃坝，漫顶，冲刷迁移，输沙
中文摘要：本文介绍了由于漫顶引起的溃坝过程中腐蚀率和输沙率的最新试验数据。为了研究冲刷迁移，对坝顶下游边缘附近的腐蚀系数进行了计算，并确定了其峰值。在溃坝过程中，垂直腐蚀的特定通过将大把分成三个区域来分析：上游区域、中间区域和下游区域。在冲刷迁移期间，三个区域显示了不同的特点，但是在溃坝过程的第三阶段都被暴露于最强烈的腐蚀中。首先，讨论了三个影响输沙的相关参数：坝顶长度，内坡度和大坝结构。结果显示：比较长的坝顶和比较平缓的内坡度可以减小峰值输沙lv和啊延长峰值率的到达时间；随着非均匀系数S的增加，峰值输沙率先增加，然后减小。

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