排灌机械工程学报2018，Vol.36Issue(4)：354-361,8.DOI:10.3969/j.issn.1674-8530.17.0004
初始含水率对斥水黏壤土入渗特性的影响
Effect of initial soil moisture content on infiltration characteristics of water-repellent clay loam
摘要
Abstract
To explore the effect of the initial moisture content on water-repellent soil infiltration process,the wetting front movement distance,horizontal-vertical ratio,cumulative infiltration volume,infiltration rate and soil water content change with different initial moisture contents were studied by a drip irrigation experiment in two-dimensional soil box with 6 initial moisture content levels (4.78％,7.28％,9.97％,13.64％,16.07％,19.02％),and the applicability of the infiltration models were evaluated.The Results show that with the increase of initial moisture content,the time that wetting front moving the same depth required is gradually decreased,and there is a better power function relationship between movement distance and time,and the horizontal-vertical ratio of wetting front decreases gradually.The cumulative infiltration volume decreases first,then increases,and the overall trend of infiltration rate is gradually decreasing,and the water-repellent soil samples' infiltration rate is increasing briefly.The infiltration law of water-repellent clay loam can be better reflected by Kostiakov model.The higher the soil water repellency,the lower the model's fitting precision.Soil moisture is concentrated on the middle area in the vertical direction,where appears an excessive saturation phenomenon with the increase of water repellency.关键词
初始含水率/斥水性/湿润锋/土壤水分分布/入渗Key words
initial moisture content/water repellency/wetting front/soil moisture distribution/infiltration分类
农业科技引用本文复制引用
刘畅,陈俊英,张林,蔡耀辉,任广栋..初始含水率对斥水黏壤土入渗特性的影响[J].排灌机械工程学报,2018,36(4):354-361,8.基金项目
国家自然科学基金资助项目(51409221,51349001) （51409221,51349001）
高等学校学科创新引智计划资助项目(B12007) （B12007）
中央高校基本科研业务费青年培育专项 （）
中央高校基本科研业务费专项资金资助项目(2425016069) （2425016069）
