摘要
为科学探究不同冻融期土壤水分运动参数变异规律,以野外大田实测土壤温度为参考.利用改进的水平土柱法测定土壤水分扩散率,用SW080B张力入渗仪测定土壤导水率.同时将试验获得的扩散率和导水率方程带入冻土水热运移方程,通过方程求解得出含水率值与实测值进行误差分析,进而验证土壤水分扩散率与导水率方程的适用性.研究结果表明:在快速冻结期,随土层深度增加,土壤扩散和导水能力呈现出增强趋势;在稳定冻结期,0~40cm土层扩散和导水能力变化不显著,且处于相对稳定状态;在融化期,土壤水分扩散和导水能力随土层深度增加呈现出先减小后增大的变化规律.此外,各土层含水率真实值和模拟值的均方根误差(RMSE)位于1.01~13.54cm^3/cm,误差较小.该试验方法能够较为精确的获取冻融期土壤水分运动参数,并且能够有效的实现冻融期土壤水分动态过程模拟.
In order to scientificallyreveal the variation regularities of soil moisture movement parameters in different freezing-thawing periods,the field soil temperature was taken as a reference.The soil moisture diffusivity was measured by improved horizontal soil column method,and hydraulic conductivity was measured by SW080B.In order to verify the applicability of the soil moisture diffusivity and hydraulic conductivity equations,it is brought into the frozen soil hydrothermal transport equation,the simulated value of soil moisture content was obtained by solving the equation,and the error analysis was carried out by comparing the simulated value with the measured value.The results show that during the rapid freezing period,with the increase of soil depth,the soil diffusion and moisture conductivity show an increasing trend.During the stable freezing period,the diffusion and conductivity of 0~40 cm soil were not significantly changed.During the melting period,with the increase of soil depth,the soil moisture diffusion and conductivity showed a trend of decreasing first and then increasing.In addition,the real and simulated root mean square error(RMSE)of soil moisture content was very small,ranging from1.01~13.54 cm^3/cm.The experimental method can accurately measure soil moisture movement parameters during freezing-thawing period,and the experimental results can effectively simulate the dynamic process of soil moisture.
作者
马效松
付强
徐淑琴
李天霄
侯仁杰
孟凡香
关智涛
MA Xiaosong;FU Qiang;XU Shuqin;LI Tianxiao;HOU Renjie;MENG Fanxiang;GUAN Zhitao(School of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin 150030,China;Key Laboratory of High Efficiency Use of Agriculture Water Resource,Ministry of Agriculture Water Resources,Ministry of Agriculture and Rural Affairs,Harbin 150030,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2020年第4期774-787,共14页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目面上项目(51679039)
国家杰出青年科学基金项目(51825901)
关键词
冻结期
融化期
土壤水分扩散率
土壤水分导水率
动态模拟
粒子群算法
freezing period
thawing period
soil moisture diffusivity
hydraulic conductivity
dynamic simulation
particle swarm optimization
作者简介
马效松(1987—),男,博士.E-mail:18800430226@163.com;通信作者:徐淑琴(1964—),女,教授,博士生导师.E-mail:693079197@qq.com
