微咸水水质对压砂地土壤入渗性能的影响  

Effects of Brackish Water Quality on Soil Infiltration Performance of Sandy Soil

作　　者：申子航 沈晖[1,2,3] 田军仓 陈海银[1] 卿家骏 李宇扬 赵广商 SHEN Zi-hang;SEHN Hui;TIAN Jun-cang;CHEN Hai-yin;QING Jia-jun;LI Yu-yang;ZHAO Guang-shang(School of Civil and Hydraulic Engineering, Ningxia University,Yinchuan 750021, China;Engineering Technology Research Center of Water-saving and Water Resource Regulation in Ningxia, Yinchuan 750021, China;Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan 750021, China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,宁夏银川750021 [3]旱区现代农业水资源高效利用教育部工程研究中心,宁夏银川750021

出　　处：《中国农村水利水电》2021年第1期147-151,共5页China Rural Water and Hydropower

基　　金：教育部“长江学者和创新团队发展计划”创新团队资助项目(IRT1067);宁夏回族自治区重点研发计划重大(重点)课题(2018BBF0202204);宁夏高等学校一流学科(水利工程)建设项目(NXYLXK2017A03)。

摘　　要：为研究土壤容重以及供水水质对土壤水分垂直入渗性能的影响,以香山地区不同容重(1.35、1.45 g/cm^3)的土壤为研究对象,通过室内土柱一维垂直入渗试验,选择供水水质为影响因子,设置4种不同电导率的供水水质(0、2.5、5.0、7.5 mS/cm)对土壤入渗时间、入渗率,盐分分布特征以及含水率分布特征进行研究,并用Philip、Kostiakov和通用经验模型来模拟土壤水分入渗过程。结果表明:微咸水入渗可以增大两种土壤的入渗性能,对土壤容重为1.35 g/cm^3的土壤影响更为明显,利用Kostiakov入渗方程能更好地拟合不同容重的土壤水分的入渗过程,且模型对土壤容重为1.45 g/cm^3的土壤入渗过程的拟合精度更高。土壤含水率与盐分再分布的过程中,在土壤上层,电导率为0 mS/cm入渗条件下,两种容重土壤的土层的含盐量均小于土壤初始含盐量,说明其在不同程度上可以淋洗盐分,在供水水质电导率为2.5、5.0、7.5 mS/cm条件下,两种容重土壤的土柱剖面均出现明显积盐的情况;在4种供水水质的入渗条件下,在土壤上层,两种容重的土壤含水率均出现急剧下降的趋势,这是由于随着电导率的增加,土壤的导水性能随之增加,但是在同一深度,土壤容重为1.35 g/cm^3的土壤含水率略高于压砂地土壤容重为1.45 g/cm^3的土壤含水率,这是由于在一定的范围内,随着土壤容重的增加导致土壤孔隙率的减小,水分的运动过程受到阻碍,进而影响到土壤的含水率。In order to study the influence of soil bulk density and water supply quality on the vertical infiltration of soil moisture,the soil of different bulk densities(1.35,1.45 g/cm^3)in Xiangshan area is taken as the research object.Water supply quality is selected as the influencing factor,and 4 different kinds of conductivity water supply quality(0,2.5,5.0,7.5 mS/cm)are set to soil infiltration time,infiltration rate,salt distribution characteristics.The distribution characteristics of water content are studied,and Philip,Kostiakov and general empirical models are used to simulate the soil water infiltration process.The results show that the infiltration of brackish water can increase the infiltration performance of the two types of soil,and the effect on the soil with a bulk density of 1.35 g/cm^3 is more obvious.The Kostiakov infiltration equation can better fit the soil moisture of different bulk density infiltration processes,and the model has a higher fitting accuracy for the soil infiltration process with a soil bulk density of 1.45 g/cm^3.In the process of redistribution of soil moisture content and salinity,in the upper soil layer,the conductivity of 0 mS/cm infiltration condition,the salt content of the soil layer of the two bulk density soils is less than the initial soil salt content,indicating that it is in different degrees salt can be rinsed on the surface.Under the conditions of water supply conductivity of 2.5,5.0 and 7.5 mS/cm,there are obvious salt accumulations in the soil column profiles of the two bulk density soils.Under the infiltration condition,in the upper layer of the soil,the soil moisture content of the two bulk densities shows a sharp decline trend,because the conductivity of the soil increased with the increase in electrical conductivity,but at the same depth,the soil bulk density.The soil moisture content of 1.35 g/cm^3 is slightly higher than the soil moisture content of the sand density of 1.45 g/cm^3.This is because within a certain range,as the soil bulk density increases,the soil

关 键 词：土壤容重 入渗率 土壤含盐量 土壤含水率 

分 类 号：TV93[水利工程—水利水电工程] S273.5[农业科学—农业水土工程]