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不同矿化度微咸水入渗下土壤水盐运移特征研究 被引量:8

Characteristics of Sand Soil Water and Salt Movement under Brackish Water Infiltration with Different Mineralization Degrees
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摘要 通过入渗试验,分析了不同入渗水质下累积灌水量、土壤湿润锋运移随入渗时间的变化以及入渗后土壤含水率、EC的变化。结果表明,随着累积灌水量的增加,入渗初期湿润锋水平推进距离大于垂直距离,且入渗初期速率较大并呈逐渐减小趋势;入渗30min后矿化度对湿润锋运移推进作用的影响愈发明显,矿化度越高,湿润锋运移距离越大,达到预定灌水量所需时间越短;累积灌水量、入渗湿润锋与入渗时间均呈良好的幂函数关系;近表层电导率和含水率受水质影响最大,湿润锋处含水率变化剧烈。 The changes of the cumulative irrigation amount and wetting front transport distance versus infiltration time were analyzed through infiltration experiments under brackish water irrigation with differentmineralization degrees, as well as soil water content and electrical conductivity after infiltration. The results showed that: with the increase of cumulative irrigation amount, the wetting front distance in horizontal direction was greater than the wetting front distance in vertical direction during the early infiltrationstage. Initial infiltration rate was larger, and tile rate gradually decreased; After infiltration for 30 min,the influences of mineralization degrees on wetting front distance were more obvious, and the higher themineralization degree, the greater the wetting front distance and the shorter the time. There was a goodpower function between wetting front distance and infiltration time, as well as between the cumulative irrigation amount and infiltration time. Electrical conductivity and soil water content near soil surface weremainly influenced by water quality, and soil water content in wetting front changed heavily.
出处 《灌溉排水学报》 CSCD 北大核心 2014年第3期68-72,共5页 Journal of Irrigation and Drainage
基金 公益性行业(农业)科研专项经费项目(201203003) 教育部"长江学者和创新团队发展计划"创新团队项目(IRT1067)
关键词 微咸水 入渗 湿润锋 水盐运移 brackish water infihration wetting front water-salt movement
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