Dynamic characteristics of river evolution under the influence of riparian vegetation cover

被引：0
|
作者：
Yang S. [1 ]
Bai Y. [1 ,2 ]
Xu H. [1 ,2 ]
Huang Z. [1 ]
机构：
[1] Institute for Sedimentation on River and Coastal Engineering, Tianjin University, Tianjin
[2] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2018年 / 49卷 / 08期
关键词：
Hydrodynamic; Natural model experiment; Riparian vegetation; River evolution; Sediment transport intensity; Vegetation cover-age rate;
D O I：
10.13243/j.cnki.slxb.20180310
中图分类号：
学科分类号：
摘要：
Riparian vegetation has an important influence on the flow movement, the stability of main channel and river bend migration, especially in the process of fluvial evolution during flood period. In order to analyze the effect of different density vegetation revetment on river dynamic process, the natural model experiment was used to simulate the river evolution process by changing the planting density and unilateral and bilateral arrangement of riparian vegetation. Given the same discharge, gradient, grain size and other water and sediment boundary conditions, set the control variable for riparian vegetation coverage, respectively, 0%, 20%, 40%, 80%. The results show that: (1) The mainstream stability of unilateral vegetation coverage is worse than that of the bilateral vegetation;(2) the more dense the riparian vegetation is, the stronger the local disturbance of the water flow to the riverbed, the longer the period of river evolution reaches a stable state;(3) the stable curvature of the meandering channel covered by the bilateral vegetation decreases with the increase of vegetation coverage. The larger flow shear force will result in larger river bend migration. © 2018, China Water Power Press. All right reserved.
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页码：995 / 1006
页数：11
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