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浙江大学学报(工学版)  2017, Vol. 51 Issue (11): 2189-2196    DOI: 10.3785/j.issn.1008-973X.2017.11.013
土木与交通工程     
丁坝周围流动图像与局部冲刷深度
孙志林, 倪晓静, 许丹
浙江大学 港口海岸与近海工程研究所, 浙江 杭州 310058
Physics of flow and local scour depth around spur dikes
SUN Zhi-lin, NI Xiao-jing, XU Dan
Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310058, China
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摘要:

为了研究非淹没丁坝局部冲刷问题,分析丁坝周围流场的实验和数值模拟数据,发现马蹄涡间存在强弱对比和坝头处横向流速占优的现象,提出以5个马蹄涡组成的涡系为主体的流动简化模型,建立丁坝局部冲刷问题的计算模型.计算模型通过考虑垂向流速影响,修正平板绕流解析解,得到适合三维流动的流量计算公式;基于水流连续性和冲刷平衡条件,建立正挑矩形丁坝在清水均匀沙床面情况下最大相对冲深与相对坝长的1/2次方和无量纲流速的1次方的半理论关系,并由现有实验数据确定未知参数值.运用半理论公式得到的计算值与实测数据符合良好,表明流动简化和计算模型合理.

Abstract:

The experimental and numerical simulation data of the flow field around the spur dike were analyzed in order to study the local scouring problem of non-submerged spur dike. There is strong difference in horseshoe vortices' strength and the lateral flow velocity dominating at the spur nose. A vortex composed of five horseshoe vortices as the simplified model of flow field were proposed, and a calculation model for local scour depth was established. Revising analytical solution of potential flow past a lateral flat plane by analyzing vertical velocity, a new formula for three dimensional flow rate was obtained. A semi-theoretical relationship of relative local scour depth proportional to the square root of relative spur length and dimensionless velocity was deduced based on the principle of flow continuity and equilibrium scour condition for the situation of 90°rectangular spur on uniform sand bed with clear approaching flow. The coefficient in the semi-theoretical formula was determined by experimental data. The local scour depth calculated by the formula accoroded well with the measured data, indicating that the simplified flow model and the calculation model were reasonable.

收稿日期: 2016-09-10 出版日期: 2017-11-13
CLC:  TV863  
基金资助:

国家自然科学基金重大研究计划资助项目(91647209),国家重点研发计划资助项目(2016YFC0402305-02).

通讯作者: 许丹,助理研究员,博士后.ORCID:0000-0002-0999-0253.     E-mail: darrenxu@zju.edu.cn
作者简介: 孙志林(1956-),男,教授,博导,从事水沙动力学与河口海岸数值模拟等研究.ORCID:0000-0002-6446-3472.E-mail:Oceansun@zju.edu.cn
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引用本文:

孙志林, 倪晓静, 许丹. 丁坝周围流动图像与局部冲刷深度[J]. 浙江大学学报(工学版), 2017, 51(11): 2189-2196.

SUN Zhi-lin, NI Xiao-jing, XU Dan. Physics of flow and local scour depth around spur dikes. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(11): 2189-2196.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2017.11.013        http://www.zjujournals.com/eng/CN/Y2017/V51/I11/2189

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