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非饱和流动
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  unsaturated flow
     Numerical solution of SUPG finite element method for unsaturated flow
     非饱和流动问题的SUPG有限元数值解法
短句来源
     In the last, we apply the HMM-FVM to the unsaturated flow in porous media.
     最后介绍了其在多孔介质非饱和流动问题中的应用。
短句来源
     In this paper a nonlinear boundary value problem which arises in an unsaturated flow with extraction is studied. A reciprocal transformation and the Hopf-Cole transformation are employed to transform the nonlinear boundary value problem into a moving boundary problem for which the Fourier series solution is obtained.
     本文研究带有抽取的非饱和流动中出现的一个非线性边值问题.利用互惠变换及HopfCole变换将问题化为一个移动边界问题,进而获得了Fourier级数解.
短句来源
  “非饱和流动”译为未确定词的双语例句
     GENERAL PROGRAM OF ONE-DIMENSIONAL FLOW THROUGH UNSATURATED HOMOGENEOUS SOIL
     均质土壤一维非饱和流动通用程序
短句来源
     The forecast of unsaturated water flow has the important significance in atmosphere science, pedology, agricultural engineering, environment engineering and ground water dynamics, etc.
     非饱和流动的预报在大气科学,土壤学,农业工程,环境工程和地下水动力学等方面具有重要意义。
短句来源
     The process of surface and ground water flow, such as atmospheric precipitation, evaporation and transpiration, surface's water leakage, absorption of roots and ground water flow, etc, all can be taken as unsaturated water flow .
     地表和地下的水流过程,如大气降水,蒸发和植物的蒸腾,地面水的渗漏和深层水的上吸,根系的吸收和地下水流等,都归结为非饱和流动
短句来源
     It is very difficult to get analytic solution except some very specific cases for the model owing to nonlinear partial differential equation.
     由于非饱和流动的数学模型归结为非线性的偏微分方程,除了一些很特殊的情况外,很难得到解析解。
短句来源
     UNSATCHEM is a simulation software for 1-D variably saturated water flow and multicomponent solute transport with chemical reactions. UNSATCHEM was applied to simulate the processes of cation exchange with solute transfer. The results showed that UNSATCHEM could successfully simulate the multicomponent solute transport processes that accompany chemical reactions.
     UNSATCHEN是用来描述一维饱和—非饱和流动状态下伴随化学反应的多组分土壤溶质运移过程的水文地球化学模拟软件,利用该软件对发生离子交换反应的多种溶质运移过程进行模拟的结果表明,UNSATCHEM能够成功地进行溶质反应情况下运移过程的模拟,对研究、解决微咸水灌溉引起的土壤盐渍化问题具有一定的指导意义。
短句来源
  相似匹配句对
     On the Instability of Saturated Sands
     饱和砂土的稳定性
短句来源
     Study on Tensile Strength of Unsaturated Loess
     饱和黄土抗拉强度的研究
短句来源
     The Space of Flows
     流动空间
短句来源
     Modernity with Flowing Feature
     流动的现代性
短句来源
     Gift Exchange
     礼物的流动
短句来源
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  unsaturated flow
Unsteady saturated-unsaturated flow to horizontal drains
      
As compared to the previous studies, the unique features of this study were to include unsaturated flow effect and to provide the physical basis and quantification for the >amp;lt;Cs(t)>amp;gt;->amp;lt;Cq(t)>amp;gt; relationship.
      
Unsaturated flow with heterogeneous soil surfaces in the field scale is an outstanding issue in hydrologic modeling.
      
The results from the upscaling of one-dimensional vertical unsaturated flow model are compared with extensive sets of Monte-Carlo simulations for several degrees of the heterogeneity in soil surfaces.
      
The method also applies to inhomogeneous media, and to cases with a partial unsaturated flow.
      
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In this paper two variation rates, K/θ and h2/Z2,are introduced in a time difference scheme of the equation of unsaturated soil water flow movement. It is considered that the two rates may show highly nonlinear characteristics of unsaturated flow movement of soil water near the abrupt interfaces of soil layers and near the sharp wetting fronts of soil water flow. The time difference equation derived from unsaturated flow equation can be approximated by Galerkin finite element or finite difference method for...

In this paper two variation rates, K/θ and h2/Z2,are introduced in a time difference scheme of the equation of unsaturated soil water flow movement. It is considered that the two rates may show highly nonlinear characteristics of unsaturated flow movement of soil water near the abrupt interfaces of soil layers and near the sharp wetting fronts of soil water flow. The time difference equation derived from unsaturated flow equation can be approximated by Galerkin finite element or finite difference method for space coordinate derivatives.

本文在对非饱和土壤水运动方程时间差分格式中引入了水力传导度K(θ)对含水率θ的变化率和压力梯度在空间上的变化率,两个因子。作者认为这两个变化率反映了土壤水在突变土层界面和水流锋面附近非饱和流动的非线性特征。所得的非饱和土壤水运动方程对时间的差分方程,在空间上不仅可用有限元法而且可用有限差分法处理。

The general equation of transfer function model (TFM) developed by Jury et al is simplified in this paper and a simplified equation of TFM is introduced suitable for studying the salt movements under infiltration. The travel time probability distribution function P(t) and its density function g(t-t'), describing salt movements through soil layers of 0-60cm, are obtained from the simplified equation for irrigation water with different salinities in the field. Some parameters such as average travel time t of salt,...

The general equation of transfer function model (TFM) developed by Jury et al is simplified in this paper and a simplified equation of TFM is introduced suitable for studying the salt movements under infiltration. The travel time probability distribution function P(t) and its density function g(t-t'), describing salt movements through soil layers of 0-60cm, are obtained from the simplified equation for irrigation water with different salinities in the field. Some parameters such as average travel time t of salt, average velocity v in pores, average water content of movable water θm, describing the charateristics of unsaturated water movement and convection transport of salt in soil layers are obtained. Some theoretical shortcomings in this research are also pointed out.

本文首先对Jury等的TFM一般方程进行了简化,导出了适于研究在入渗条件下描述盐分对流运移的TFM简化方程;根据田间高低不同矿化度水灌溉入渗试验结果和上述简化方程,得到了盐分通过0—60cm土层的时间概率分布函数P(t)及其相应的密度函数g(t—t’),同时还推求出有关描述土壤水非饱和流动和盐分对流运移特征的参数:如盐分通过所研究土层的平均时间t、水分在土壤孔隙中的平均流速V、土体中可动水体的平均含水率θ_m等,并对这些参数进行分析和讨论;最后指出了本文在理论方面的不足之处和尚待进一步探讨的问题.

The features of natural soil profile of rice field and the significances of steady flow rate in the profile for the growth of rice, water management of rice fields, planning and designing of drainage project and evaluation of agricultural ecosystem are discussed. The criteria for forming unsaturated flow between the least permeable layer (plowgh pan or clayey soil) and subsoil are presented based on Darcy's general equation. After introducing the Gardner's model, in which hydraulic conductivity exponentially...

The features of natural soil profile of rice field and the significances of steady flow rate in the profile for the growth of rice, water management of rice fields, planning and designing of drainage project and evaluation of agricultural ecosystem are discussed. The criteria for forming unsaturated flow between the least permeable layer (plowgh pan or clayey soil) and subsoil are presented based on Darcy's general equation. After introducing the Gardner's model, in which hydraulic conductivity exponentially relates to negative soil water pressure, into Darcy's equation, the author presents analytical equations for calculating steady flow rate through the profile and for calculating pressure distributions within two unsaturated zones. The calculated flow rate and pressure distribution based on the analytical equations presented in the paper agree well with the field experimental data appeared in reference [5]. The conclusions and equations in this paper can be applied to analyze any problems of coexistence of saturated and unsaturated flow in three-layer soils.

本文论述了稻田土层剖面特征和下渗强度对于水稻生长、稻田水管理、排水系统规划设计和农业生态环境评价的重要意义。根据达西方程推导了稻田淹灌期在犁底层或粘性土层的下部和底土层的上部形成非饱和流动的判别条件,根据Gardner的非饱和水力传导度与负压水头成指数关系的K(h)描述模型,推导出通过稻田土层剖面下渗强度q的解析表达式,及两个非饱和区域内的负压水头分布方程。根据文献[5]提供的实测资料,应用本文有关方程分析和计算了二层土中的下渗强度和非饱和区域内的负压分布,所得结果与该文献中的实验观测和数值分析结果完全一致。本文结果可用于分析由任何三种不同土质组成的层状土层剖面中的饱和-非饱和下渗流动问题。

 
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