不同土壤温度和容重下微咸水上升毛管水运动特性HYDRUS模拟及验证  

Simulation and Verification of Movement Characteristics of Upward Capillary Water Flow of Saline Water in Soils with Different Soil Temperatures and Bulk Densities Using HRDRUS

作　　者：陈琳[1] 费良军[1] 傅渝亮 王子路 钟韵 CHEN Lin;FEI Liangjun;FU Yuliang;WANG Zilu;ZHONG Yun(Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048;Yellow River Institute of Hydraulic Research, Zhengzhou 450003)

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]黄河水利科学研究院,郑州450003

出　　处：《水土保持学报》2018年第6期87-96,185,共11页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(51779205;51479161);陕西省水利科技项目(2014slkj-02)

摘　　要：为探索西北干旱地区不同质地土壤以及土壤温度和容重对微咸水上升毛管水运动特性的影响,通过模拟和室内试验,研究了土壤温度和容重对砂壤土和粉壤土上升毛管水运动特性的影响。分别建立了地下水补给量与土壤温度和容重之间的模型,毛管水上升高度与土壤温度和容重之间的模型,其中地下水补给量模型,砂壤土的绝对系数均达到0.96以上,计算值与模拟值最大相对偏差小于10.9%,粉壤土的绝对系数均达到0.96以上,计算值与模拟值最大相对偏差小于8.4%,毛管水上升高度模型,砂壤土的绝对系数均达到0.996以上,计算值与模拟值最大相对偏差小于8.37%,粉壤土的绝对系数均达到0.997以上,计算值与模拟值最大相对偏差小于11.9%,模型拟合程度较好,所建立方程符合实际情况。砂壤土盐分主要聚集在距地表1.70～2.20m处,粉壤土盐分主要聚集在距地表0.3～1.3m处,砂壤土土壤盐分分布受土壤温度和容重的影响较显著,而粉壤土土壤盐分分布受其影响并不显著。该研究结果可为盐碱化地区水盐管理提供科学依据。To explore the effects of soil texture,soil temperature and bulk density on movement characteristics of upward capillary water flow of saline water in soil of northwest arid region,a lab simulation experiment was conducted in sandy loam and clay loam by HYDRUS-1D.The models of ground water recharge of capillary water with soil temperature and bulk density of were built.For sandy loam,the absolute coefficient was above0.96,RMSE was less than0.95cm,and the maximum relative deviation between the calculated and simulated values was less than11.9%,while the corresponding values were0.96,4.3cm and less than8.4%respectively in clay loam.The models of rising height of capillary water with soil temperature and bulk density were also built.For sandy loam,the absolute coefficient was above0.996,RMSE was less than2.7cm and the maximum relative deviation between the calculated and simulated values was less than8.37%,and the corresponding values were0.997,less than3.8cm and less than11.9%respectively for clay loam.The fitting degree of the model was good,and the equation established was in line with the actual situation.The salt contents of sandy loam mainly gathered at1.70~2.20m from the surface,while0.3~1.3m for clay loam.The distribution of soil salinity in sandy loam soil was significantly affected by soil temperature and bulk density,but only soil bulk density worked in clay loam and temperature had little effect.To summarize,these research results could provide scientific foundation for water and salt management in salinized area.

关 键 词：微咸水 地下水 土壤温度 土壤容重 毛管水上升高度 地下水补给量 

分 类 号：S275.3[农业科学—农业水土工程] S152.7[农业科学—农业工程]