期刊
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
卷 30, 期 3, 页码 343-351出版社
SHANGHAI UNIV
DOI: 10.1007/s10483-009-0308-1
关键词
flexible vegetation; PVC slice; micro ADV; mixing-length approach; streamwise velocity distribution; Reynolds stress; river compression parameter
资金
- National Natural Science Foundation of China [50679061, 50709025, 50749031]
By choosing a PVC slice to simulate flexible vegetation, we carried out experiments in an open channel with submerged flexible vegetation. A 3D acoustic Doppler velocimeter (micro ADV) was used to measure local flow velocities and Reynolds stress. The results show that hydraulic characteristics in non-vegetation and vegetation layers are totally different. In a region above the vegetation, Reynolds stress distribution is linear, and the measured velocity profile is a classical logarithmic one. Based on the concept of new-riverbed, the river compression parameter representing the impact of vegetation on river is given, and a new assumption of mixing length expression is made. The formula for time-averaged velocity derived from the expression requires less parameters and simple calculation, and is useful in applications.
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