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动力弥散系数
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  相似匹配句对
     DETERMINATION OF THE DISPERSIVE COEFFICIENT IN GROUNDWATER
     地下水弥散系数的测定
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     DETERMINATION OF SHEAR DYNAMIC FACTOR IN BEAMS
     梁的剪力动力系数的确定
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     STUDY OF DYNAMIC DIFFUSION COEFFICIENTS OF SOIL MOISTURE
     土壤水动力弥散系数研究
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     The Stability of Dynamical Systems of Complex Coefficients
     复系数离散动力系统的稳定性
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     ON THE TRANSPORTATION AND COEFFICIENT OF TURBULENT DISPESJON OF DUST IN MINE AIRWAYS
     矿井粉尘的迁移及弥散系数的研究
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  dispersivity coefficient
Further, transport appears significantly more sensitive to the diffusion coefficient than to local-scale dispersion processes represented by a dispersivity coefficient.
      


In this paper, a new methed to calculate the hydrodynamic dispersion parameters under one-dimensional unsatuicd condition has been developed by means of mass conservation. According the soil water flow condition, four formulas for calculating the Parameters of dispersion have been acheived. By using the Steady evaperation experiments. We Calculated the dispersion Parameters of wehe finesandy, and with the parameters calculated and numerical method, compared the numerical datas and experimental datas, result...

In this paper, a new methed to calculate the hydrodynamic dispersion parameters under one-dimensional unsatuicd condition has been developed by means of mass conservation. According the soil water flow condition, four formulas for calculating the Parameters of dispersion have been acheived. By using the Steady evaperation experiments. We Calculated the dispersion Parameters of wehe finesandy, and with the parameters calculated and numerical method, compared the numerical datas and experimental datas, result indicated that agrement is well.

本文基于质量守恒原理,推导出了一种计算水动力弥散系数的方法。对四种不同水流及初始盐分浓度条件下的弥散系数计算给出了具体公式和试验方法。通过稳定蒸发试验求出了卫河粉砂土的水动力弥散系数。利用该参数和数值模拟对相同土壤在水平吸湿条件下的盐分运动试验结果做了模拟对比,吻合较好,表明所求参数反映了土壤的物理特性。

The study of hydrodynamic dispersion coefficients of soil moisture are summarized and the mothods used to compute the coefficients are discussed. According to the results achieved abroad, some opions on the application of models are putforward.

本文概述了国内外水动力弥散系数的研究情况,并对其计算方法加以评述,结合国外最新研究成果,提出模型应用的几点看法。随着农业生产的发展和农业科学技术水平的提高,要求农田合理施肥,经济灌溉和有效预测、控制土壤盐碱化,防止农药,化肥及废水灌溉引起土壤和地下水污染,以及土壤溶质随地表径流迁移,引起水环境污染和土壤生产力降低,已成为当今世界普遍关注的问题。对此研究涉及到对土壤溶质的研究。对土壤溶质研究最广泛是利用数学模型,模拟土壤溶质运动,其水动力弥散系数是不可缺少的参数之一。水动力弥散系数由扩散系数和机械弥散系数组成。

The horizontal column infiltration method was used to measure the soil water diffusivity D. and the hydrodynamic diffusion-dispersion coefficients of the Lou soil. It shows that the date determined preserve similarity well and give a good reproducibility during the horizontal column infiltration into the Lou soil with low salt-concentration solution, and so the theoreticatyl analysis is correct. It is proved that the method used to # measure the Hydrodynamic diffusion-dispersion coefficients of the Lou soil...

The horizontal column infiltration method was used to measure the soil water diffusivity D. and the hydrodynamic diffusion-dispersion coefficients of the Lou soil. It shows that the date determined preserve similarity well and give a good reproducibility during the horizontal column infiltration into the Lou soil with low salt-concentration solution, and so the theoreticatyl analysis is correct. It is proved that the method used to # measure the Hydrodynamic diffusion-dispersion coefficients of the Lou soil is feasible.

通过水平土柱渗吸法测定杨陵土的水动力弥散系数表明,对于低浓度盐溶液水平土柱入渗土,实测的土壤水分扩散率和水动力弥散系数,规律性较好.且有较好的重现性。理论分析是正确的,说明用此法测定土的水动力弥散系数是可行的。

 
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