An improved numerical model for groundwater flow simulation with MPFA method on arbitrary polygon grids

Gao，Yulong1,2,3; Du，Erhu2,3; Yi，Shuping2,3; Han，Yu2,3; Zheng，Chunmiao2,3

2022-03-01

10.1016/j.jhydrol.2021.127399

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

Groundwater models are critical for simulating subsurface hydrological processes and guiding informed policy-making for groundwater management. However, the widely applied groundwater models typically use regular-shaped grids to discretize aquifer systems and require that the directions of the grid edges are aligned with the hydraulic conductivity tensor. Such rigorous requirements for spatial discretization have constrained the models’ application in aquifer systems with anisotropic hydrogeological characteristics. To address such limitations, we develop an improved groundwater flow model based on the multipoint flux approximation (MPFA) method in this study. The new model allows us to use arbitrary-shaped polygon grids to discretize aquifer systems and relaxes the rigorous requirement of the alliance between polygon edges and hydraulic conductivity tensor. The functionality and performance of the new model are demonstrated by comparing the output between our model, MODFLOW, and analytical solution in four case studies with various hydrogeological conditions. In a real-world watershed with complex-shaped boundaries, our model outperforms the conventional groundwater model in boundaries. The modeling results show that our model can yield accurate simulation of subsurface hydrological processes in aquifer systems with complex-shaped boundaries. Furthermore, our model can provide a more flexible discretization solution to couple surface water and groundwater model in integrated hydrological model development.

Arbitrary polygon grids Confined and unconfined aquifers Control volume scheme Groundwater flow model MODFLOW Multipoint flux approximation

SCI ; EI

英语

通讯

National Natural Science Foundation of China[41877193,41931292] ; start-up funds for scientific research of high-level talents in Shenzhen[Y01296126] ; Leading Talents of Guangdong Province program[2016LJ06N469]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000752516600004

ELSEVIER

20220311461918

Aquifers ; Groundwater flow ; Groundwater resources ; Hydraulic conductivity ; Hydrogeology ; Numerical methods ; Surface waters ; Tensors ; Water management

Surface Water:444.1 ; Groundwater:444.2 ; Geology:481.1 ; Fluid Flow, General:631.1 ; Hydraulics:632.1 ; Mathematics:921 ; Algebra:921.1 ; Numerical Methods:921.6

ENGINEERING

2-s2.0-85122630467

Scopus

1.School of Environment,Harbin Institute of Technology,Harbin,150090,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,Shenzhen,China

Gao，Yulong,Du，Erhu,Yi，Shuping,et al. An improved numerical model for groundwater flow simulation with MPFA method on arbitrary polygon grids[J]. JOURNAL OF HYDROLOGY,2022,606.

Gao，Yulong,Du，Erhu,Yi，Shuping,Han，Yu,&Zheng，Chunmiao.(2022).An improved numerical model for groundwater flow simulation with MPFA method on arbitrary polygon grids.JOURNAL OF HYDROLOGY,606.

Gao，Yulong,et al."An improved numerical model for groundwater flow simulation with MPFA method on arbitrary polygon grids".JOURNAL OF HYDROLOGY 606(2022).