变化初始含水率条件下土壤入渗特性试验及模拟研究  

Experimental and simulation study on soil infiltration characteristics under varying initial moisture contents

作　　者：豆静静 郑志伟 高卓卓 Dou Jingjing;Zheng Zhiwei;Gao Zhuozhuo(College of Water Conservancy Engineering,Tianjin Agricultural University,Tianjin 300392,China)

机构地区：[1]天津农学院水利工程学院,天津300392

出　　处：《天津农学院学报》2023年第2期11-17,共7页Journal of Tianjin Agricultural University

基　　金：国家自然科学基金项目(51779174);天津市“项目+团队”重点培养专项(XB202016);天津市科技支撑重点项目(18YFZCSF00650)。

摘　　要：为研究初始含水率对土壤入渗特性的影响,设置5种不同处理(初始含水率分别为1.5%、7.5%、13.5%、19.5%、25.5%)进行室内土柱试验,记录各土柱的入渗时间和灌水量,利用规划求解工具确定Kostiakov-Lewis模型、Horton模型和Philip模型3个模型参数。结果表明:①初始含水率一定时,累积入渗量随时间逐渐增大,入渗速率随时间逐渐减小,初始含水率对入渗速率有显著影响。②当初始含水率≤19.5%时,3个模型的适用性均较好,实测值与模拟值的相关系数均在0.99以上,当初始含水率>19.5%时,Kostiakov-Lewis模型和Philip模型的适用性较好,Horton模型的适用性较差。③在Kostiakov-Lewis模型中,入渗系数k随初始含水率的变化波动最大,稳渗率f0波动最小,入渗指数α介于两者之间;在Horton模型中,初始入渗率i0随初始含水率的变化波动最大,稳渗率ic波动最小,参数β介于两者之间;在Philip模型中,土壤吸渗率S随初始含水率的变化波动较大,稳渗率A波动较小。To study the influence of initial moisture content on soil infiltration characteristics,five different treatments were set up(the corresponding initial moisture contents were 1.5%,7.5%,13.5%,19.5%,and 25.5%),and indoor soil column experiments were conducted.The infiltration time of each soil column and the amount of water injected every time were recorded.The planning-solving tools were used to determine the parameters of the Kostiakov-Lewis model,Horton model and Philip model.The results showed that:①When the initial moisture content was constant,the cumulative infiltration volume gradually increased with time,and the infiltration rate gradually decreased.The initial moisture content had a significant effect on the fluctuation of the infiltration rate.②When the initial moisture content was less than 19.5%,the applicability of the three models was good,whose correlation coefficients of the measured and simulated values were all above 0.99.When the initial moisture content was more than 19.5%,the applicability of the Kostiakov-Lewis model and the Philip model was good,but the Horton model was not so good as them.③In the Kostiakov-Lewis model,the fluctuation of infiltration coefficient k with different initial moisture contents was maximal,the stable permeability f0 was minimum,and infiltration index a was between them.In the Horton model,the fluctuation of the initial infiltration rate i0 with different initial moisture contents was the most obvious,the stable infiltration rate ic was the least significant,and the parameterβwas between them.In the Philip model,the fluctuation of the soil absorption rate S with different initial moisture contents was bigger,and the stable infiltration rate A was smaller.

关 键 词：初始含水率 入渗特性 Kostiakov-Lewis模型 Horton模型 Philip模型 

分 类 号：S275.3[农业科学—农业水土工程] TV93[农业科学—农业工程]