observational dispersion

Based on the theoretical analysis of the values of the macrodispersivity and retardation coefficient,the radionuclide migration in groundwater at an uranium mill-tailing site in southern China was simulated with hydrogeochemical program PHREEQC Ⅱ.

对宏观弥散度和阻滞系数的取值进行了理论分析,运用PHREEQCⅡ软件,以我国南方某铀水冶尾矿库为例,探讨了宏观弥散度和阻滞系数对地下水中核素迁移模拟的影响。

The effect of the statistical properties and the hydraulic properties on the macrodispersivity is studied for the adsorbing solute transport in heterogeneous unsaturated soil.

本文研究了重力为非饱和水分运动主要驱动力时,吸附溶质的宏观弥散度与孔隙介质统计特性和水力特性的关系,研究结果表明,宏观弥散度随溶质运移距离的增加而增加,并逐渐趋于一常数,宏观弥散度是土壤含水量、溶质吸附特性以及非饱和土体统计参数的函数,随平均含水量的增加而减少,随平均吸附因子和σ_f~2、σ_a~2λ_f和λ_a的增加而增大。

On the basis of hydrodynamic dispersion theory,an experimental set for dispersion test has been improved,and then NaCl is used as s tracer to measure the breakthrough curve of the solute with the help of a conductometer At last,the dispersivity is determined with an analytic metho

以水动力弥散理论为基础，根据改进的水动力弥散装置，以氯化钠作为示踪剂，用电导仪间接地测定溶质的突破曲线，最后用解析法确定地下水多孔介质中溶质迁移的弥散度。

The relationship among the diameter and dispersity of the carbide and the hardness of the annealed H13 steel shows that when the volume of the carbide is constant, hardness is the .

对Ｈ１３钢退火碳化物颗粒的平均直径、弥散度与硬度的关系的研究表明，在碳化物体积分数一定时，硬度是碳化物颗粒平均直径的函数，颗粒直径越大，退火硬度越低。