摘要
利用环刀法测定2处不同时间崩塌的崩积体不同部位的渗透性能。结果表明:(1)崩壁上的土壤崩塌形成崩积体后,土壤疏松,水分达到稳渗的时间比崩壁上红土层、砂土层的短。(2)崩积体的初渗率、稳渗率、平均入渗率、入渗量的均值均比崩壁上的红土层、砂土层和碎屑层的高;经过压实的BJ1的初渗率、稳渗率、平均入渗率、入渗量均比BJ2的低;崩积体表层形成结皮,土壤入渗能力降低;崩积体物质组成的不同及堆积、胶结、压实等作用,崩积体不同部位的渗透性能有较大的差异,BJ1的初渗率、稳渗率、平均入渗率、入渗量的变异系数(CV)分别为0.70,0.65,0.60和0.63,BJ2的为0.54,0.51,0.56和0.56,均属于中等变异。(3)最小二乘法拟合结果显示,Kostiakov模型能更好地模拟崩积体土壤的入渗过程。
The cutting ring method was used to measure the permeability of different parts of slumping deposits（SD） in two different collapse time in this study.The results showed that：（1）When water reached the steady infiltration of SD was shorter than that of red soil layer（RSL） and sand layer（SL）.（2）Initial infiltration rate,steady infiltration rate,average infiltration rate and amount of infiltration of SD were higher than those of RSL,SL and debris layer（DL）.BJ1’s infiltration was higher than that of BJ2.The surface infiltration was lower because of the soil crust.Different composition of SD and the function of accumulation,bonding and compaction led to differences of different parts of SD.The coefficients of variation（CV） of initial infiltration rate,steady infiltration rate,average infiltration rate and amount of infiltration of BJ1 were 0.70,0.65,0.60 and 0.63,and BJ2’s were 0.54,0.51,0.56 and 0.56,respectively,which indicated that the four parameters of SD were intermediate variability.（3）The least-squares fitting results showed that Kostiakov model was the best model to simulate soil infiltration process of SD.
出处
《水土保持学报》
CSCD
北大核心
2013年第3期49-54,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41001169
40671113)
关键词
崩岗
崩积体
土壤渗透
土壤侵蚀
Benggang
slumping deposits
soil permeability
soil erosion
