The change of big pore section shape has more influence on soil water movement , but in small pore channels , the influence is small , in addition of pore section shape , it can get better prediction of unsaturated hydraulic conductivity 粗大孔隙通道的截面形状及变化对水分运动影响较大，较细空隙通道截面的形状对水分运动影响较小。修正孔隙截面形状对水分运动的影响，进一步考虑孔隙截面形状因子对土壤水分运动的影响，可以得到对土壤水分运动参数更正确地预测。
Numerical models were used to study how the infiltration into a slope varies with the rainfall intensity , rain fall duration , soil properties and how the infiltration influences the stability of a slope . a numerical program is coded to solve the transient seepage field by using the finite element and finite difference methods based on the saturated - unsatured soil seepage theory . a model for considering the variations of soil weight and shear strength is created / constructed and the corresponding program is coded 本文针对受降雨影响显著的非饱和残积土土坡，运用饱和?非饱和土壤水分运动的理论和二维非稳态渗流有限元模型，模拟雨水入渗引起的暂态渗流场，将计算所得到的暂态孔隙水压力分布用于考虑了基质吸力影响的土坡稳定安全系数的计算当中，建立了考虑非饱和土土坡从雨水入渗到出现滑坡危险全过程的计算模型。
Based on the project 《 numerical simulation for water flow and solute transport through soils 》 supported by science and technology creation foundation of xi ' an university of technology , numerical simulation for water flow and solute transport through soils by using the characteristic finite element method is mainly studied and some valuable results are obtained as follows : 1 本文结合西安理工大学科技创新项目《土壤水分运动及溶质运移的数值模拟》 ，主要针对土壤水分运动和土壤溶质运移的特征有限元数值模拟方法进行了研究，取得了如下一些结果： 1
There is a period of soil contents range from ten to twenty five days over the humid discussed area in summer , and the period is not obvious at the discussed zone of close oasis desert area in summer and winter . ( 2 ) soil temperature exits several periodic variations of different depths ranging from six to twenty four days in heihe region , and nine to thirty days in gaize and shiquanhe region . it also shows that gradient of soil temperature affects on the soil content movement more greatly in summer . ( 3 ) the land surface temperature of yangtze river lower region is retrieved from noaa - ahvrr data ( 2 )根据土壤温湿资料，采用功率谱分析、 pca分析等方法，分析了两种典型下垫面土壤温度的时空分布特征及其对土壤水分运动的影响，发现研究区土壤温度除日和年变化周期外还存在6 30天的不同周期；下垫面的非均匀性及其季节变化及温度梯度变化对土壤水分运动有很大影响，冬季温度梯度变化对土壤含水量影响大于夏季温度梯度对上壤含水量变化的影响，且温度梯度与水分运动方向相反。
Based on the fundamental theory of dynamics of soil moisture and the condition of water storage pit irrigation , numerical modeling of soil moisture movement of single water storage pit in heterogeneous soil is established . adi ( alternating direction implicit method ) and gauess - seidel iterative method are used to solve it . by using the simulated value of modeling , the relation of water injection volume and maximum horizental distance of moisture frontal are concluded . according to the relation , interval of pits are derived . then , after analyzing the infiltration characteristic of soil moisture under the condition of interference infiltration in multi storage pit , numerical modeling of soil moisture movement of multi water storage pit in heterogeneous soil is established , and its numerical solution is also acquired 利用adi (交替方向隐式差分法)结合gauess ? seidel迭代法对模型进行数值求解。利用模型的计算结果得出了单坑注水量与湿润锋最大水平推进距离之间的关系，并据此确定了坑距。在此基础上，通过对多坑干扰入渗条件下土壤水分入渗特性进行分析，太原理工大学硕士研究生学位论文建立了蓄水多坑非均质土壤水分运动数学模型，并对其进行数值求解。
This experiment was designed according to the special soil moisture in the north in china as well as the different water requirements in the different growth periods of the maize . the author put forward a practical technique by comparing the water - supply conditions in the different periods of time and ensuring the growth target and the yield target under the best water - supply condition 针对北方旱区土壤水分运动存在冬季缓慢散墒、春季进入强烈跑墒期以及玉米在不同生长期需水差异这一特点，试验设计提出了节水渗灌这一技术的田间试验方案，比较不同时期的供水状况，最后确认在最佳的供水条件下的玉米生长指标及产量指标，提出一套较实用的玉米渗灌节水生产技术。
Based on the observation made on the main crops such as wheat , corn , cotton etc . , the observed data from the limited irrigation test for three years are obtained , and then the test data are analyzed with the theory of soil moisture movement and the model of farm crop ' s evaporation is established under the condition of insufficient irrigation 摘要通过对小麦、玉米、棉花等主要农作物的分阶段受旱试验，获得了三年的限额灌溉试验观测数据；采用非充分灌溉条件下的土壤水分运动理论分析试验数据，建立了限额灌溉条件下的作物蒸发蒸腾模型。
