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| DOI： |
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| Study on Resistance Characteristics for Overland flow under Different Density of Flexible Vegetation Cover |
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ZHAO Lu, SUN Juying, ZHANG Lu, PAN Xueqian, LEI Xiaozhang
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State Key Laboratory of Hydraulics and Mountain River Engineer, Sichuan University, Chengdu 610065, China
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| Abstract: |
| Based on the method of integrating theoretical analysis with experiment, a series of overland flow experiments were carried out to study the influence of three different coverage and two slope groups of the perennial ryegrass on resistance characteristics of overland flow. The interaction between the form of flexible vegetation and flow was primarily discussed under certain conditions. The experiment results showed that Manning coefficient increased and then decreased and increased finally as the Reynolds number increased with surface coverage of vegetation; Manning coefficient did not increase as vegetation density increased; when the slop was 5o, Manning coefficient decreased with Froude number by good power function, but 10o did not. With the same Froude number, Manning coefficient decreased with the slope increases. |
| Key words: overland flow; the density of vegetation; resistance characteristics; Manning coefficient |
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