摘要
通过室内模拟降雨入渗试验,研究了粘土、壤土和沙土3种土壤不同分层组合方式对土壤入渗特性的影响。结果表明:垂直入渗条件下,分层土壤入渗特征由土壤分层组合方式决定;分层土壤累计入渗量与湿润锋距离呈线性相关关系;分层土壤入渗过程中,当粗沙覆盖细沙且降雨强度大于下层细沙土稳定入渗率时,湿润锋以上剖面可以达到或接近饱和,当细沙覆盖粗沙且降雨强度大于细沙土稳定入渗率时,湿润锋剖面中,除细沙土部分剖面达到饱和,其余粗沙土剖面无法达到饱和,且其饱和程度和下层粗沙土土壤持水能力有关。
Based on the laboratory rainfall-infiltration experiments,different stratified soil infiltration characteristics were studied with different combination of clay,loam and sandy soil.The results show that： Under vertical rainfall infiltration,stratified soil infiltration characteristics is determined by the combination of soil layered pattern;soil cumulative infiltration has a linear relationship with wetting front distance;during layered soil infiltration,when coarser sand covers finer sand and rainfall intensity is greater than fine sand steady infiltration rate,the profile above the wetting front reaches or approaches saturation.Whilst in the case that finer sand covers coarser sand and rainfall intensity is greater than fine sand steady infiltration rate,except for the profile of fine sand part is saturated,the remaining coarse sand profile cannot be saturated,and its saturated degree is related to coarse sandy soil water holding capacity.
出处
《水土保持学报》
CSCD
北大核心
2012年第5期217-219,223,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(50939006)
国家重点基础研究发展规划项目(2006CB403404)
国家自然科学创新研究群体基金项目(51021006)
关键词
入渗
分层土壤
土壤累计入渗量
湿润锋距离
infiltration
layered soil
soil cumulative infiltration
wetting front distance
