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水动力弥散系数    
相关语句
  hydrodynamic dispersion coefficient
    Considering the influences of uncertain factors of hydrodynamic dispersion coefficient and measurement error on the reliability of contaminant concentration estimation, a discussion was made on the reliability of contaminant transportation in groundwater by use of the niche-hybrid genetic algorithm, and the direct and inverse analysis of contaminant concentration was also performed under the reliability condition, providing more information for decision-making in groundwater environmental protection and regulation.
    在地下水污染物迁移问题中,考虑水动力弥散系数及测量误差的不确定性因素对浓度估计可靠性的影响,采用小生境混合遗传算法,对地下水污染物迁移的可靠性进行探讨,并在可靠性条件下进行污染浓度正反问题分析,为地下水环境保护和调控提供更多的决策依据。
短句来源
  hydrodynamic dispersion coefficient
    Considering the influences of uncertain factors of hydrodynamic dispersion coefficient and measurement error on the reliability of contaminant concentration estimation, a discussion was made on the reliability of contaminant transportation in groundwater by use of the niche-hybrid genetic algorithm, and the direct and inverse analysis of contaminant concentration was also performed under the reliability condition, providing more information for decision-making in groundwater environmental protection and regulation.
    在地下水污染物迁移问题中,考虑水动力弥散系数及测量误差的不确定性因素对浓度估计可靠性的影响,采用小生境混合遗传算法,对地下水污染物迁移的可靠性进行探讨,并在可靠性条件下进行污染浓度正反问题分析,为地下水环境保护和调控提供更多的决策依据。
短句来源
  hydrodynamic dispersion coefficient
    Considering the influences of uncertain factors of hydrodynamic dispersion coefficient and measurement error on the reliability of contaminant concentration estimation, a discussion was made on the reliability of contaminant transportation in groundwater by use of the niche-hybrid genetic algorithm, and the direct and inverse analysis of contaminant concentration was also performed under the reliability condition, providing more information for decision-making in groundwater environmental protection and regulation.
    在地下水污染物迁移问题中,考虑水动力弥散系数及测量误差的不确定性因素对浓度估计可靠性的影响,采用小生境混合遗传算法,对地下水污染物迁移的可靠性进行探讨,并在可靠性条件下进行污染浓度正反问题分析,为地下水环境保护和调控提供更多的决策依据。
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  hydrodynamic dispersion coefficient
Dye concentrations obtained by means of an image processing method are used in conjunction with an analytical solution to identify the hydrodynamic dispersion coefficient that governs the advective-dispersive transport problem.
      
  hydrodynamic dispersion coefficient
Dye concentrations obtained by means of an image processing method are used in conjunction with an analytical solution to identify the hydrodynamic dispersion coefficient that governs the advective-dispersive transport problem.
      
  hydrodynamic dispersion coefficient
Dye concentrations obtained by means of an image processing method are used in conjunction with an analytical solution to identify the hydrodynamic dispersion coefficient that governs the advective-dispersive transport problem.
      


Based on the convection-dispersion equation (CDE) and the transfer function model (TFM) on a lognormal probability density function (pdf) of solute travel time, a new predicting model was developed to describe the leaching dynamics of pesticides undergoing adsorption in a sandy loamy saturated soil during steady flow. To establish the model, (i) we carried out a tracer miscible displacement experiment to obtain the breakthrough curve (BTC), and then applied the code CXTFIT 2.0 to solve an inverse problem for...

Based on the convection-dispersion equation (CDE) and the transfer function model (TFM) on a lognormal probability density function (pdf) of solute travel time, a new predicting model was developed to describe the leaching dynamics of pesticides undergoing adsorption in a sandy loamy saturated soil during steady flow. To establish the model, (i) we carried out a tracer miscible displacement experiment to obtain the breakthrough curve (BTC), and then applied the code CXTFIT 2.0 to solve an inverse problem for obtaining hydraulic dispersion coefficient, (ii) for the different retardation factors of various pesticides, we constructed a series mathematical experiments to solve the direct problem of CDE, and the simulated BTCs of the pesticides were generated, and (iii) fit the simulated BTCs with lognormal pdfs, and the mean and variance values of the travel times corresponding to the different retardation factors of various pesticides were obtained. We found that, there was a power function relationship between mean and retardation factor, while the fluctuation of variance was small with respect to the retardation factor. Moreover, the same trend was presented in the change of the retardation factors with the mean and variance values of travel times at different averaged pore water velocities. Satisfying results were received in testing the precision of the model prediction by using the leaching experiment of atrazine.

基于对流 弥散方程 (CDE)的解和传递函数模型 (TFM)中呈对数正态分布的溶质迁移时间的概率密度函数 ,构造了稳定流场饱和砂质壤土中仅考虑吸附作用时农药淋溶动态的预报模式 .建立该模式的思路首先是利用示踪剂的穿透曲线 ,由CDE的解析解反求水动力弥散系数 ;再针对不同的阻滞因子通过求解CDE正问题的数学实验 ,生成农药穿透曲线的模拟值 .接着应用对数正态概率密度函数拟合得到相应于不同阻滞因子的农药迁移时间的均值和方差 .结果表明 :均值与阻滞因子为乘幂函数的关系 ,而方差随阻滞因子的变化甚小 ,且不同流速下农药迁移时间的均值与方差随阻滞因子的变化亦呈现相同的规律 .通过农药阿特拉津的淋溶实验对该模式的预报精度进行了检验

Considering the influences of uncertain factors of hydrodynamic dispersion coefficient and measurement error on the reliability of contaminant concentration estimation, a discussion was made on the reliability of contaminant transportation in groundwater by use of the niche-hybrid genetic algorithm, and the direct and inverse analysis of contaminant concentration was also performed under the reliability condition, providing more information for decision-making in groundwater environmental protection and regulation....

Considering the influences of uncertain factors of hydrodynamic dispersion coefficient and measurement error on the reliability of contaminant concentration estimation, a discussion was made on the reliability of contaminant transportation in groundwater by use of the niche-hybrid genetic algorithm, and the direct and inverse analysis of contaminant concentration was also performed under the reliability condition, providing more information for decision-making in groundwater environmental protection and regulation. The result of study shows that the niche-hybrid genetic algorithm is feasible and effective for reliability analysis of contaminant transportation in groundwater.

在地下水污染物迁移问题中,考虑水动力弥散系数及测量误差的不确定性因素对浓度估计可靠性的影响,采用小生境混合遗传算法,对地下水污染物迁移的可靠性进行探讨,并在可靠性条件下进行污染浓度正反问题分析,为地下水环境保护和调控提供更多的决策依据。分析结果表明,小生境混合遗传算法在地下水污染物迁移问题的可靠性分析中具有可行性和有效性。

On the premise of considering diffusion,absorption-desorption,distribution and biodegradation of chemical pollutants in solid-water environment,a water solute coupled model for chemical pollutant transportation and transformation has been developed based on the theory of soil solute transport,and the non-equilibrium adsorption is sufficiently described in the model.Numerical simulation for aldicarb transport in soil is presented.And the sensibility of some important parameters(water content,adsorption rate and...

On the premise of considering diffusion,absorption-desorption,distribution and biodegradation of chemical pollutants in solid-water environment,a water solute coupled model for chemical pollutant transportation and transformation has been developed based on the theory of soil solute transport,and the non-equilibrium adsorption is sufficiently described in the model.Numerical simulation for aldicarb transport in soil is presented.And the sensibility of some important parameters(water content,adsorption rate and hydrodynamic dispersion coefficient) is analysed.The results show that the variation of water content has an important part in pollutant migration and transformation,which provides theoretical evidence for quantitative analysis of potential effects of pesticide transport on groundwater pollution and by planners for making management decision.

在综合考虑农药类污染物在非饱和土壤环境中的水动力弥散、吸附解吸及微生物降解等环境行为的前提下,建立土壤中农药类化学污染物迁移的耦合动力学模型,模型中充分考虑了溶质在土壤固体骨架上非平衡吸附作用,并对农药阿特拉津在土壤中的运移过程进行了数值模拟,对模型中的几个重要参数(含水率、吸附速率和水动力弥散系数)进行了灵敏度分析;结果表明,土壤水分含量变化对农药类污染物质在环境介质中迁移转化起着重要作用。这对于定量化分析农药类污染物在土壤中迁移对地下水污染的潜在性影响提供了可靠的理论根据,同时可为现场农药环境污染评价提供技术支持。

 
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