单坑变水头入渗条件下均质土壤水分运动的数值模拟  

Numerical simulation of homogenous soil moisture movement under varying-head infiltration of single water storage pit

作　　者：马娟娟[1] 孙西欢[1] 李占斌[2] 

机构地区：[1]太原理工大学水利科学与工程学院,太原030024 [2]西安理工大学水利水电学院,西安710048

出　　处：《农业工程学报》2006年第6期205-207,共3页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50379031);山西省青年科技研究基金资助项目(20031053);山西省科技攻关项目(051115)

摘　　要：变水头入渗条件下的土壤水分运动是蓄水坑灌的基本理论问题。该文根据土壤水动力学的基本理论,分析了蓄水坑变水头入渗的复杂边界条件,并推导了其坑水位变化与坑壁变水头入渗关系的数学表达式,进而建立了蓄水坑灌单坑变水头入渗及土壤水分运动的数学模型。采用AD I交替方向隐式差分格式将土壤水分运动方程离散,用G auess-Se idel迭代算法求解非线性差分方程,实现了单坑变水头条件下的土壤水分运动的数值模拟。实验验证表明,数值计算结果与实测值有着较好的一致性。Soil moisture movement under varying-head infiltration is a basic theoretical problem of water storage pit irrigation. According to the fundamental theory of soil moisture dynamics, the complicated varying-head infiltration boundary of water storage pit irrigation was analyzed, the mathematic expression between water level and varylng-head infiltration of pit wall was obtained, and the numerical model of soil water movement was established under the condition of water storage pit irrigation. ADI method and Gauess-Seidel iterative method were used to realize the numerical simulation of soil moisture movement under varying-head infiltration of single water storage pit. A series of experiments were conducted to verify the model. The results indicate that the calculated results are in accordance with the experimental results.

关 键 词：蓄水坑灌 变水头入渗 土壤水分运动 数值模拟 

分 类 号：S152.7[农业科学—土壤学] S275.9[农业科学—农业基础科学]