降雨入渗对黄土斜坡土体含水率时空分布特性的影响  

Temporal-spatial Distribution of Soil Water Content in Loess Slope Subjected to Rainfall Infiltration

作　　者：薛强[1] 唐亚明[1] 孙萍萍[1] 毕俊擘[1] 

机构地区：[1]国土资源部黄土地质灾害重点实验室/中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《水土保持通报》2014年第2期53-56,共4页Bulletin of Soil and Water Conservation

基　　金：中国地质调查局项目"延安市地质灾害监测预警"(1212011140018);国土资源部野外科学观测研究基地项目

摘　　要：为了对降雨入渗引起黄土斜坡土体含水率的变化有较深入的了解,在陕西省延安市宝塔山选取了一个典型的黄土自然斜坡进行土体含水率和降雨联合监测。监测结果表明,斜坡土体中的含水率对降雨入渗的响应具有时间上的滞后性与空间上的差异性。当日降雨量达到10mm或10d累计降雨量达到70mm时,降雨入渗对土体含水率的影响深度小于1.0m;当日降雨量达到50mm或10d累计降雨量达到140mm时,降雨入渗对土体含水率的影响深度小于2.0m。同时,当小时降雨量达到10.4mm时,降雨入渗至0.2m的入渗速率为0.04m/h,由0.2m入渗至1.0m的入渗速率为0.033m/h,降雨入渗速率随着土层深度的增加而减小。To understand the variation of soil water content in loess slope due to rainfall infiltration,the soil water content and rainfall were monitored on a typical natural loess slope in Baota Mountain of Yan＇an City, Shaanxi Province.The monitoring results showed that there was temporal hysteresis and spatial difference in the responses of soil water content to rainfall infiltration.The impact depth of rainfall infiltration was less than 1.0mwhen the daily rainfall was 10mm or the 10-day cumulative rainfall reached 70mm.When the daily rainfall was 50mm or the 10-day cumulative rainfall reached 140mm,the impact depth was less than 2.0m.The rate of rainfall infiltration was 0.04m/h at the shallow depth of 0.2mand it decreased to 0.033 m/h from the depth of 0.2mto 1.0mwhen the cumulative rainfall reached to 10.4mm per hour at the study area.The rainfall infiltration rate decreased with the increase of depth.

关 键 词：黄土斜坡 降雨入渗 监测 土体含水率 

分 类 号：S152.7[农业科学—土壤学]