摘要
利用野外原型坡面开展径流冲刷模拟试验,定量研究9L/min和20°条件下裸坡坡面、人工草被坡面和自然修复坡面的产流产沙特征及变化规律。结果表明:(1)自然修复坡面比人工草被坡面减水减沙和增加入渗的作用更明显,和裸坡相比,自然修复坡面的产沙量比裸坡减少89.76%～98%,径流量减少46.97%～53.30%,坡面入渗率比裸坡高114%～126.54%;对于人工草被坡面来说,产沙量比裸坡减少约95%,径流量减少不足20%,入渗率比裸坡高约50%。(2)在3种立地类型条件下,产沙和径流、产沙和阻力系数的关系均呈负相关关系,但与裸坡和人工草被坡面相比,自然修复坡面的产沙径流关系、产沙和阻力系数关系的相关性较弱,这可能与其坡面近地表覆盖情况较复杂有关,因此其坡面水沙关系有待于进一步研究。
The characteristics as well as the correlation between runoff and erosion was studied under 3 kinds of cover conditions of bare-slope, artificial grass slope and ecological-restoration slope with 20 slope gradient by runoff scouring intensities of 9 L/min. The results showed that： （1）Ecological-restoration slope had more obvious reduction o{ erosion and runoff than the artificial grass slope. Both compared with the bare slope, reduc- tion of sediment yield was 89.76~98 ~//00 and flow reduction was 46.97 ~//0 ~53.30o//oo, infiltration rate increased 114~ 126. 54~ on ecological-restoration slope~ for artificial grass slope, sediment yield reduction was about 95O//oo and runoff reduction was less than 20~, increase of infiltration rate was about 50~. （2）Under 3 kinds of site types, the relationship showed a negative correlation between sediment yield and runoff, sediment yield and the drag coefficient, but compared with the bare slope and artificial grass slope, the corre- lation coefficient of the ecological-restoration slope was very low, This may be related to the complex coverage nearby the surface, so further studies should be carried out to promote runoff-sediment relations on ecological-restoration slope.
出处
《水土保持学报》
CSCD
北大核心
2012年第4期28-31,36,共5页
Journal of Soil and Water Conservation
基金
国家重点基础研究发展计划“973”项目(2011CB403303)
中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2011-03,HKY-JBYW-2012-12)
关键词
水沙关系
原型坡面
自然修复坡面
径流冲刷
runoff-sediment relationship
field prototype slope
ecological-restoration slope
runoff scouring
