河宽缩窄率对河床冲刷形态影响数值模拟研究

发布时间：2018-04-14 01:07

本文选题：非淹没丁坝 + 数值模拟　；参考：《水力发电学报》2017年08期

【摘要】：丁坝的存在导致河道流场结构发生变化,进而引起丁坝坝头的局部冲刷,并对附近的河床演变产生影响,河宽缩窄率(丁坝长度与河宽比值)是影响河道局部冲刷形态的重要参数。本文采用数值模拟方法研究不同河宽缩窄率情况下,非淹没丁坝坝头冲刷深度及冲刷形态的变化规律。结果表明,河宽缩窄率0.5以下时,最大冲刷深度随河宽缩窄率的增加基本上呈线性增加,河宽缩窄率超过0.5以后,最大冲刷深度增加剧烈,同时丁坝对水流的影响范围也达到了对岸,冲坑的范围扩展到了河对岸边,且冲坑形态也发生了较大的变化。研究成果对于实际丁坝工程选择适当的河宽缩窄率具有重要的参考借鉴意义。
[Abstract]:The existence of spur dike causes the change of river flow field structure, and then causes the local scour of the dike head, and affects the evolution of nearby riverbed.The ratio of river width narrowing (the ratio of dike length to river width) is an important parameter that affects the local scour form of river channel.In this paper, a numerical simulation method is used to study the variation of erosion depth and erosion form of unsubmerged spur dike head under the condition of different river width narrowing rate.The results show that the maximum erosion depth increases linearly with the increase of the river width narrowing rate when the river width narrowing ratio is below 0.5, and the maximum scour depth increases sharply when the river width narrowing rate exceeds 0.5.At the same time, the influence range of groin on water flow reaches to the opposite bank, the range of scour pit extends to the bank of river, and the shape of scour pit also changes greatly.The research results have important reference significance for the selection of appropriate river width narrowing rate in practical spur-dike projects.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室培育基地;
【基金】：国家自然科学基金(51579206) 陕西省自然科学基础研究计划(2015JM5201)
【分类号】：TV147

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