水质对层状土壤入渗过程的影响

Effects of Water Quality on Infiltration of Layered Soils

供水水质的异同可能会影响层状土壤积水的入渗过程。将去离子水、天然降水、天然积水、自来水4种水质的水作用于3种土壤构型(均质塿土、塿夹砂、砂夹塿),讨论了4种水质的积水入渗对层状土壤结构入渗特征的影响。结果表明,不同水质和土壤构型的入渗时间由长到短分别为:去离子水、天然降水、自来水、天然积水(不同水质)和均质塿土、塿夹砂、砂夹塿(不同土壤构型)。4种水质累积入渗量的变化趋势基本相同,其累积入渗量由大到小分别为:天然降水、自来水、去离子水、天然积水(不同水质)和砂夹塿、塿夹砂、均质塿土(不同土壤构型)。相同时间内不同土壤构型的湿润锋推进距离由小到大为:均质塿土、塿夹砂、砂夹塿;水质对层状土壤湿润锋推进距离的影响程度由土壤分层组合方式决定。

Differences in the water quality can affect the water infiltration process of layered soil. Four kinds of water,de-ionized water,natural water,natural precipitation and tap water were used to act on three soil configurations（ homogeneous loess soil,loess soil with gravel and sand with loess soil）,and the influences of these four kinds of water on the infiltration characteristics of the layered soil structures were studied. The results showed that the infiltration descending time order of these four kinds of water in the three soil configurations was： de-ionized water,natural water,tap water,and natural precipitation.The changing trends of cumulative infiltration amount in the four kinds of water qualities were basically the same,and the descending order of cumulative infiltration amount was： natural water,tap water,deionized water,natural precipitation; sand with loess soil,loess soil with gravel,and homogeneous loess soil. The ascending sort order of advancing distances of wetting front in the same period was：homogeneous loess soil,loess soil with gravel,and sand with loess soil. The influence degree of water quality on infiltration rate,cumulative infiltration amount and the wetting front＇s advancing distance of layered soil was determined by the layered combination mode of the soil.