双重介质模型在岩溶地下水流动系统模拟中的应用  

Application of double medium flow model to modeling of karst groundwater flow system

作　　者：吴世艳[1] 周启友[1] 杨国勇[2] 张晓勇[3] 

机构地区：[1]南京大学地球科学系、水科学系,南京210093 [2]中国矿业大学资源与地球科学学院,徐州221008 [3]江苏省环境监测中心,南京210036

出　　处：《水文地质工程地质》2008年第6期16-21,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(40371021);国防科工委高放废物地质处置研究项目资助

摘　　要：文章采用不稳定层状裂隙水流模型,应用有限元-卷积结合法,模拟了岩溶地下水流动系统。相对于等效多孔介质模型,双重介质模型模拟的水位下降速度更小,达到稳定的时间更长。距抽水井较近的观测孔处,双重介质模型模拟的水位变化过程阶段性较明显,水位变化过程类似于承压含水层-弱透水层的释水过程,裂隙和孔隙基质分别相当于承压含水层和弱透水层。然后讨论了影响裂隙和孔隙基质间水流交换项的因素,分析了孔组抽水后的渗流场特征。In this paper, an unsteady parallel fracture flow model and a combined finite element-convolution approach are used to simulate and analyze karst groundwater flow systems. Compared with conventional equivalent porous medium model, the water level changes simulated by this double medium flow model are slower and the time of being stable is longer. For the water level simulated by this model, there exist clear water level change stages at the observation well near the pumping wells. The process of water level changes simulated by the unsteady parallel fracture flow model is analogous to that of the classical aquifer-aquitard system, in which the fracture and the matrix block is treated as the confined aquifer and the overlying confined aquitard, respectively. Factors that influence the matrix-to-fracture water leakage term and flow fields after group-well pumping are also discussed in the paper.

关 键 词：岩溶地下水流动系统 不稳定层状裂隙水流模型 有限单元-卷积结合法 水流交换项 等效多孔介质模型 

分 类 号：P641.134[天文地球—地质矿产勘探]