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非饱和土壤     
相关语句
  unsaturated soil
     The results show that the unsaturated soil water diffusivity ranged from 8. 30×10-4 to 4. 23 cm2/ min, and was influenced by soil moisture.
     结果表明:非饱和土壤水扩散率变化于8.30×10-4-4.23cm2/min之间,土壤水分扩散率随土壤含水量的变化而变化。
     The results show that the unsaturated soil water diffusivity ranged from 8. 30×10-4 to 4. 23 cm2/ min, and was influenced by soil moisture.
     结果表明:非饱和土壤水扩散率变化于8.30×10-4~4.23cm2/min之间,土壤水分扩散率随土壤含水量的变化而变化。
     (3) The unsaturated soil diffusion coefficient of studied soils ranged from 1.053×10~(-3)~1.886×10~(-3) cm~2/min, which was in a sharp positive r elation with soil moisture content in exponential function.
     非饱和土壤水扩散率变化于 1.1× 10 - 3~ 1.886× 10 - 3cm2 / min之间 ,非饱和土壤水扩散率随含水量也呈指数曲线变化。
短句来源
     Discussion on unsaturated soil of Richards infiltration equation
     非饱和土壤Richards方程入渗求解探讨
短句来源
     Characteristics Finite Difference Methods and Numerical Simulation for the Unsaturated Soil Water Flow Problem
     非饱和土壤水流问题的特征差分方法及数值模拟
短句来源
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  the unsaturated soil
     The results show that the unsaturated soil water diffusivity ranged from 8. 30×10-4 to 4. 23 cm2/ min, and was influenced by soil moisture.
     结果表明:非饱和土壤水扩散率变化于8.30×10-4-4.23cm2/min之间,土壤水分扩散率随土壤含水量的变化而变化。
     The results show that the unsaturated soil water diffusivity ranged from 8. 30×10-4 to 4. 23 cm2/ min, and was influenced by soil moisture.
     结果表明:非饱和土壤水扩散率变化于8.30×10-4~4.23cm2/min之间,土壤水分扩散率随土壤含水量的变化而变化。
     (3) The unsaturated soil diffusion coefficient of studied soils ranged from 1.053×10~(-3)~1.886×10~(-3) cm~2/min, which was in a sharp positive r elation with soil moisture content in exponential function.
     非饱和土壤水扩散率变化于 1.1× 10 - 3~ 1.886× 10 - 3cm2 / min之间 ,非饱和土壤水扩散率随含水量也呈指数曲线变化。
短句来源
     Characteristics Finite Difference Methods and Numerical Simulation for the Unsaturated Soil Water Flow Problem
     非饱和土壤水流问题的特征差分方法及数值模拟
短句来源
     Similarity Analysis of the Unsaturated Soil Water Movement and Its Scaling Application
     非饱和土壤水分运动的相似性分析及标定应用
短句来源
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  “非饱和土壤”译为未确定词的双语例句
     The parameters of Gardner_Russo model for describing the soil retention curves are obtained based on the movement rules of horizontal one_dimensional soil water infiltration.
     本文基于水平一维非饱和土壤水分运动规律,推求了Gardner_Russo持水曲线模型参数,获得了水平一维非饱和土壤水分运动中累积入渗量、入渗率、湿润峰、入渗时间之间的理论关系。
短句来源
     (2)Based on these models, the net increase of soil available water and soil unsaturated conductivity of different water content have been calculated with 1℃ increase of temperature and the clearer quantitative models of directly calculating temperature effect have been derived. 
     (2)在已有模型的基础上,计算了不同含水量下,温度升高1℃所引起非饱和土壤导水率和土壤有效水的净增加量,并推导出更为直观的温度对土壤水分传导有效性影响的定量模型,可以直接计算不同温度下非饱和土壤导水率的温度效应。
短句来源
     KH2PO4, solution infiltrated into horizontal columns of five types of soils was tested, and their hydrodynamic dispersion coefficients Dsh (θ)were calculated.
     本文用水平土柱法进行了KH2PO4在五种非饱和土壤中的入渗实验,测定了磷离子综合扩散系数Dsh(θ)讨论了测定方法及结果。
短句来源
     The spatial distributions of soil hydraulic properties and soil water Variables in a stratified soil are described as random space functions,and three types of models of AR(1),MVAR (1),and NNM are adopted to generate realizations for saturated hydraulic conductivity, poresize distribution parameter and soilwater capacity.
     在田块尺度条件下的层状土壤中,土壤水力特性及土壤水分变量在空间上的分布可以看作是一维随机空间函数的实现。 利用AR(1),MVAR(1)和NNM等3种随机生成模型分别生成饱和水力传导度、孔隙大小分布参数和容水度的随机样本,在此基础上利用随机模拟法对一维非饱和土壤水分运动进行了随机模拟。
短句来源
     The Determination of Dispersion Coefficient by Convective Dispersive Equation
     用对流扩散方程确定非饱和土壤水动力弥散系数
短句来源
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  unsaturated soil
Infiltration of rainwater not only results in wetting-induced softening of the shallow unsaturated soil layers, but also leads to the increase of horizontal stress.
      
Application of fractal theory to unsaturated soil mechanics
      
The unsaturated soil water diffusivity of the studied soils ranged from 0.07 to 10.46 cm2/min, and was related to the water content via an exponential relationship.
      
The problem of the freezing of an unsaturated soil is formulated for a compressible gas and equal component pressures.
      
The study took advantage of recent research on unsaturated soil behaviour and applied this information to real-time modelling of climatic conditions.
      
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  non-saturated soils
This paper aims at completing and extending the theories as they have been applied to swelling media for the last 50 years, to swelling non-saturated soils.
      
  其他


In this paper existing outflow methods of transient change of pressure for determining dynamic parameters of unsaturated soil water are surveied and a proposed method for non-negligible porous plate impedence is introduced. This paper mainly presents a new outflow method of gradual change of pressure and its nomograph for use in calculation of parameters.

本文对测定非饱和土壤水运动参数的各种瞬时变压出流法,作了简要的评述和比较,并补充了由多孔板阻抗计算参数的方法及用表.文中提出了测定参数的渐变变压出流新方法及其诺模图.

A numerical model of one-dimensional flow through unsaturated homogeneous soil has been developed to simulate the water movement in soil with a deep ground-water table under the initial and boundary conditions. This method can be used for the study of the infiltration, evaporation, transpiration and redistribution of water in soil profilc as well as the water movement process while these phenomena appear alternatively. The modelling experiment programmed with FORTRAN has been carried out on a computer M-150...

A numerical model of one-dimensional flow through unsaturated homogeneous soil has been developed to simulate the water movement in soil with a deep ground-water table under the initial and boundary conditions. This method can be used for the study of the infiltration, evaporation, transpiration and redistribution of water in soil profilc as well as the water movement process while these phenomena appear alternatively. The modelling experiment programmed with FORTRAN has been carried out on a computer M-150 and verified by laboratory tests. Using this program the following were calculated: (1) comparison between the steady and fluctuating evaporation, (2) water regime in profile versus steady rain infiltration in soil, and (3) variation of water in soil profile during growing period of wheat.

本文建立了一个非饱和土壤水一维流动的数值计算模型,用以模拟均质土壤、地下水埋藏很深,且在不同的初始条件与边界条件下的水分运动。可用来计算土壤剖面入渗、蒸发、蒸腾和再分配以及当这些现象交替出现时的水分运动过程。程序用FORTRAN语言编写,在M-150计算机上实现,并经室内试验初步检验。用该程序计算了几个算例:(1)稳定蒸发与波动蒸发的比较;(2)稳定降雨入渗土壤水分变化状况;(3)小麦生育期土壤剖面水分变化。

The horizontal two-dimensional flow and vertical two-dimensional flow were tested in the laboratory and their mathematical models were developed respectively. The results obtained from numerical calculations with the finite difference method well agreed with those obtained from experiment. This shows that the mathematical models are applicable.The two-dimensional unsaturated flow in the soil under subsurface irrigation was simulated with the model under different conditions such as various initial water content...

The horizontal two-dimensional flow and vertical two-dimensional flow were tested in the laboratory and their mathematical models were developed respectively. The results obtained from numerical calculations with the finite difference method well agreed with those obtained from experiment. This shows that the mathematical models are applicable.The two-dimensional unsaturated flow in the soil under subsurface irrigation was simulated with the model under different conditions such as various initial water content in soil, various kinds of soil, different compaction and water supply pipes with difterent diameters. On the basis of the dara from calculation, the influences of various factors on two-dimensional unsaturated flow of the soil under subsurface irrigation are analyzed and some views about reasonable management of subsurface irrigation are recommended.

本文对渗灌条件下的非饱和土壤水二维流动问题进行了探讨。对水平二维流及垂直二维流均进行了重复实验,并建立了相应的非饱和土壤水二维流的数学模型。按有限差分的计算方法求到数学解且与实验结果相符合,验证了该数学模型的可行性。同时应用数学模型对田间渗灌在不同条件下(如不同初始含水量、不同的土质、不同的密实度及不同直径供水管等几个主要因素)的非饱和土壤水二维流进行了模拟计算。根据计算结果分别就上述各影响因素对田间渗灌的非饱和二维流动的差异性进行了分析,由此对田间渗灌中若干问题提出初步看法。

 
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