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

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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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.

 CLC: TV863

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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.

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