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饱和非饱和土壤
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  saturated-unsaturated soil
     In this paper, modified Picard iteration ,method is applied to solve the mixed form of Richards equation for water movement in saturated-unsaturated soil. The mass balance error in this algorithm is far less than that in traditional procedure in which the Picard iteration method is applied to solve the capillary pressure based form of Richards equation.
     利用改进型Picard迭代差分法求解饱和-非饱和土壤中水分运动的混合型Richards方程,避免了传统利用Picard迭代法求解h型Richards方程所出现的质量平衡误差等问题;
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  相似匹配句对
     The Changing Characteristics of Hydraulic Diffusivity in Unsaturated Soil
     饱和土壤水扩散系数的变化特征
短句来源
     Analysis of the Parameters of Unsaturated Soil Water Movement
     饱和土壤水分运动参数的分析
短句来源
     Temperature Effect of Soil Unsaturated Water Conductivity
     土壤饱和导水率温度效应研究
短句来源
     Maximum Principles for an Unsaturated Flow Problem
     饱和土壤水流方程的极值原理
短句来源
     Field Measurement of Unsaturated SoilWater Movement Parameters
     田间饱和土壤水分运动参数测定
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In defining the hydrodynamic delivative for soil water flow the vertically two-dimensional saturated-unsaturated flow equation is transformed into a lagrangian one described along the characteristic curve, and the gravity term is considered as an important factor leading to the numerical difficulties encountered when this type of flow problems are simulated. A hybrid method combining the characteristic method with ADI scheme is presented here to overcome the numerical difficulties, Examination with expermental...

In defining the hydrodynamic delivative for soil water flow the vertically two-dimensional saturated-unsaturated flow equation is transformed into a lagrangian one described along the characteristic curve, and the gravity term is considered as an important factor leading to the numerical difficulties encountered when this type of flow problems are simulated. A hybrid method combining the characteristic method with ADI scheme is presented here to overcome the numerical difficulties, Examination with expermental results has shown the reliability of the method. The highly computational efficiency and numerical accuracy of the method have been further demonstrated by comparing it with conventional ADI.

将特征值法与交替方向有限差分法相结合,求解具有重力项的二维饱和——非饱和土壤水流问题,在数值稳定性和计算效率方面较一般的数值解法有明显的优越性。

Based on the experiment of the soil water-salt movement,a mathemat-ical model of solute transport in soils under influnce of soil absorption andimmobile water and a mathematical model of soil water movement were used.After compared with the numerical solutions of solute convection-diffusi onequation in the one-dimensional saturated-unsaturated soil under evaporationcondition,the numerical method of the Characteristic Method combined withFinite Element scheme (CMFE) was used to calculate and simulate solutetransfer...

Based on the experiment of the soil water-salt movement,a mathemat-ical model of solute transport in soils under influnce of soil absorption andimmobile water and a mathematical model of soil water movement were used.After compared with the numerical solutions of solute convection-diffusi onequation in the one-dimensional saturated-unsaturated soil under evaporationcondition,the numerical method of the Characteristic Method combined withFinite Element scheme (CMFE) was used to calculate and simulate solutetransfer through the saturated and unsaturated soils systematically underirrigation (infiltration),evaporation and redistribution conditions.

本文在水盐运移实验基础上,正确地采用了考虑土壤不动水体与吸附作用的溶质运移数学模型和以v为因变量的土壤水分数学模型。在非饱和蒸发条件下对各种求解溶质运移方程的数值方法进行了系统比较,采用了适合于本研究特征—饱和—非饱和流的特征—有限元法对灌溉入渗、蒸发和再分配条件下饱和—非饱和土壤溶质运移规律作了较系统的计算机数值模拟与预测研究。

Based on soil water dynamics,saturated unsaturated soil movement math model with the parameter(h) has been esablished.Based on the concept of NASH instan taneously unit hydrograph,the runoff collection model has been established and verified using"July 94"flood in SHUNYI COUNTY in the thesis.The model can be used to calculate the modulus of waterlogging protection。

以土壤水动力学为基础,建立了饱和非饱和土壤水运动的h方程数学模型。并根据Nash瞬时单位线,建立了汇流模型。利用以上模型对北京市“94.7”暴雨的洪水过程进行了计算,与实测结果基本吻合。本文所求模型可用来计算田间排涝模数

 
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