改进的随机步行法在溶质运移模拟中的应用  

APPLICATION OF MODIFIED STOCHASTIC WALK METHOD TO SOLUTE TRANSPORT SIMULATION

作　　者：黄勇[1] 周志芳[1] 王锦国[1] 

机构地区：[1]河海大学土木工程学院地质工程系,南京210098

出　　处：《岩石力学与工程学报》2004年第14期2326-2330,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50239070);国家自然科学基金项目(50179010);河海大学院士基金资助课题。

摘　　要：随机步行法是模拟裂隙网络中溶质运移的有效方法。传统的随机步行法是由给定的时间步长确定质点的新位置,时间步长的大小难以确定。对传统的随机步行法进行了改进,即由空间步长的大小来确定时间步长,避免时间步长确定的人为因素。通过算例,比较了传统的随机步行法、解析法和改进的随机步行法,结果表明,改进的随机步行法能更好地模拟裂隙网络的溶质运移,模拟的结果更准确。Stochastic walk method is an effective method of modeling solute transport in fracture network. Traditional stochastic walk method locates new position of particle though given time step. However, it is difficult to define the size of time step. The size of time steps has an important effect on precision of simulation results. In this paper, traditional stochastic walk method is modified. In the condition of known spatial step, the analytical expression is developed between time and spatial steps. As a result, the size of time steps is expressed by spatial step automatically, which can avoid artificial factors in defining time step. At last, traditional stochastic walk method, analytical method and modified stochastic walk method are compared through a case study. Results show that solute transport in fracture network can be modeled efficiently based on modified stochastic walk method and that the modeling result is of relative high accuracy.

关 键 词：水文地质 改进的随机步行法 裂隙网络 溶质运移 质点 

分 类 号：P641.2[天文地球—地质矿产勘探]