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[1]LIANG Xiaoyu,XIN Zhongbao,XIA Xiaoping.Influence of Vegetation Types on the Hydrodynamic Characteristics of Overland Flow on Slopes in Riparian Zone[J].Research of Soil and Water Conservation,2023,30(01):113-119.[doi:10.13869/j.cnki.rswc.2023.01.016]

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Influence of Vegetation Types on the Hydrodynamic Characteristics of Overland Flow on Slopes in Riparian Zone

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 113-119 Column: Public date: 2023-01-10

Title:: Influence of Vegetation Types on the Hydrodynamic Characteristics of Overland Flow on Slopes in Riparian Zone

Author(s):: LIANG Xiaoyu, XIN Zhongbao, XIA Xiaoping; (College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China)

Keywords:: riparian zone; overland flow; scouring experiment; flow velocity; hydrodynamic characteristics

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.01.016

Abstract:: In order to study the influence of riparian zone vegetation types on the hydrodynamic characteristics of the overland flow, through the field water discharge scour experiments simple runoff plot, the variations of hydrodynamic parameters of overland flow were analyzed at three flow rates(4, 6, 8 L/min)and 6 different slope types. The results show that:(1)the average flow velocity increases with runoff inflow rates and the presence of vegetation on the slope has the effect of reducing the flow velocity; the average flow velocity 〔(0.276±0.065)m/s〕 of the bare slope is significantly higher than those on the slopes with other vegetation types(p<0.05);(2)the Reynolds number increases with runoff inflow rates, and shows an overall increasing trend with the increase of the runoff inflow time, the overland flow patterns of all riparian zones belong to laminar flow; the Froude number decreases firstly and then stabilizes with the increase of runoff inflow time; except for Cynodondactylon, the average Froude number is greater than 1 in all types, indicating that the overland flow belongs to the rapid flow;(3)vegetation coverage can significantly reduce the slope runoff Reynolds number and Froude number, and the Reynolds number(128.53)and Froude number(4.0)of the bare slope were significantly higher than those of the other slope types(p<0.05). The Darcy-weisbach resistance coefficient(3.71)and the Manning roughness coefficient(0.062)of the Cynodondactylon were the largest, showing the best hindrance to the overland flow on the slope.

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Last Update: 2023-01-10