TANG Ke-ming, ZHANG Guang-hui, REN Zong-ping. Dynamic Mechanism of Soil Detachment by Shallow Flow on Slope[J]. 2011, 25(4).DOI:
坡面薄层水流分离土壤的动力学机理
摘要
为探讨土壤分离过程的水动力机理及植被根系对土壤分离的抑制作用
采用变坡实验水槽
系统研究坡度、流量及根系对土壤分离速率的定量影响。结果表明
土壤分离速率是坡度、流量及根系密度的函数;植被根系能显著降低土壤分离速率
草地土壤分离速率均值仅为休闲对照地的30.6%;随根系密度增加
土壤分离速率呈指数关系下降;0~4 kg/m3为根系减少土壤分离的有效密度区间
在此范围内
根系密度的增加能引起土壤分离速率的急剧降低
超过4 kg/m3
随根系密度增加
土壤分离速率的降幅并不明显。
Abstract
This study was conducted to investigate the hydro-dynamic mechanism of soil detachment and the erosion-reducing effects of grass root.Soil detachment rate was measured using a laboratory flume to study the relationships between it and slope gradient
flow discharge
and grass root.The experimental results indicated that soil detachment rate could be predicted accurately using slope gradient
flow discharge
and root density.The mean value of root-permeated soil detachment rate(switch grass) accounted for 30.6% ...