模型嵌套技术在济南趵突泉泉域数值模型中的应用

Application of Local Grid Refinement Technique in Numerical Model of Baotu Spring Area in Jinan City

摘要:

在地下水数值模型中，经常需要对某一重点区进行详细刻画，模型嵌套技术仅需对原有模型进行较小的修改，并不需要重新进行网格剖分，就可以达到网格加密的目的。该文在系统分析济南趵突泉泉域水文地质条件的基础上，采用地下水数值模拟软件GMS10.0，建立了覆盖趵突泉泉域的地下水流数值模型，利用更加灵活、高效的共享节点的嵌套技术，对济南西郊重点区域进行加密，并与未加密、全局加密的模拟结果进行对比。结果表明：LGR在提高加密区和非加密区模拟精度的同时，大大缩减了模型的运行时间，并减小了磁盘空间的占用。随着济南市地表水转化地下水工程的建设，LGR可以应用于对断裂、补源河流、回灌井等的精确刻画，更好的为社会、工程服务。

Abstract:

In the numerical model of groundwater, it is often necessary to refine areas of some important areast. The model nesting technique only needs to modify the original model with little modification, and does not need to remeshing. Previous studies have tended to focus on the theory of cryptography, but lack of practical application in groundwater numerical simulation. Based on the analysis of hydrogeological conditions of the Baotu Spring area in Jinan city, a numerical model of groundwater flow is established by using the groundwater numerical simulation software GMS10.0. By using more flexible and efficient sharing nodes of local grid refinement (LGR) , the key areas of western Jinan city have been refined. Comparing with the results of refined and global refinement, it is showed that LGR improves the accuracy of water level simulation in the refined and unrefined areas. LGR reduced the average absolute error of simulated water level in refined and unrefined areas by 19% and 14%, respectively. Compared with the global refinement, the running time of LGR has been reduced by 92.27% before and after operation. The disk space is reduced by 78.63% and 93.80% respectively. LGR can greatly reduce the running time of the model and disk space occupancy, and improve the simulation precision of refinement area and unrefinement area. With the construction of projects of groundwater transformation into groundwater in Jinan city, LGR can be applied to portray the fault, artificial recharge river and recharge wells precisely and server for the community, engineering better.