基于MODFLOW的地下水流模型前处理优化  

Preprocessing Optimization of Groundwater Flow Model Based on MODFLOW

作　　者：韩忠[1] 邵景力[1] 崔亚莉[1] 程汤培[2,3] 李玲[1] 杨程[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]北京应用物理与计算数学研究所计算物理重点实验室,北京100088 [3]北京应用物理与计算数学研究所高性能计算中心,北京100094

出　　处：《吉林大学学报（地球科学版）》2014年第4期1290-1296,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家"973"计划项目(2010CB428804)

摘　　要：MODFLOW中现有的降水补给数据和井流数据是基于每个剖分网格输入的,导致基于MODFLOW建立大区域水流数值模型前处理的降水补给文件和井流文件存储开销过大、读取效率低。为此,通过改进现有的降水补给子程序包RCH及开发新的子程序包RAW,给出了一种基于面状补排项的数据输入新方法。改进后的MODFLOW程序通过读取RCH文件或RAW文件中每个分区的补排量数据,以及每个网格对应的分区编号,在程序内部实现了补排量向每个模型网格的分配。RAW子程序包实现了多层面状补排量的表达,可用于面状的地下水开采、农业回灌等源汇项的处理。相对于原始的源汇项数据存储方式,基于新方法建立的华北平原地下水流模型,RCH及RAW文件大小分别减小为原来的1/145和1/255,整个模型数据的读取时间的加速比为7.46。Reading and writing precipitation and well data are all based on each grid in the existing MODFLOW.So building regional groundwater flow numerical models with refined spatial and temporal discretization often involves storing and reading large quantities of well and precipitation data.However, the storage requirement can be prohibitive and the program efficiency can be quite low.To address this problem,we have modified the existing package RCH and also developed a new package named RAW （recharge and well ）, which is based on the existing packages in MODFLOW. The improved MODFLOW program can only read values of every subarea and the subarea number of each grid which is stored in the RCH or RAW file,and then allocates the values to corresponding grids.With the RAW＆amp;nbsp;package,the area recharge and discharge could occur in all layers.Therefore,it could be used to simulate the source and sink term,like groundwater exploitation and agricultural irrigation return.The correctness has been verified and the efficiency has been tested through simulating a theoretical groundwater flow model and a real North China Plain model respectively.Compared with the traditional method of storing data,the size of RCH and RAW file decreases 1/145 and 1/255 respectively,and the time ratio for reading data is 7.46.

关 键 词：MODFLOW RCH RAW大区域地下水模拟 华北平原 

分 类 号：P641.1[天文地球—地质矿产勘探]