水科学进展2018，Vol.29Issue(1)：50-56,7.DOI:10.14042/j.cnki.32.1309.2018.01.006
有限单元法模拟地下水流的水头反常现象——对流量计算的作用
Abnormal waterhead phenomenon in groundwater flow simulation by using the finite element method: caused by the computation of advection fluxes
摘要
Abstract
Numerical simulations are an important tool for quantitative research on the volume and quality of groundwater.To reveal the cause of an abnormal waterhead phenomenon using the finite element method,a three-dimensional inhomogeneous model is applied as a case study.The Lumped Mass method is an alternative approach for computing storage changes,which can be used to ameliorate abnormal waterheads.In this paper,the Lumped Mass method is applied to an abnormal waterhead phenomenon by analyzing the local conservation.It is observed that the advection fluxes in the control domain of a vertex refer to the hydraulic gradients in that slice and in adjacent slices.As water starts to be pumped,the potential of the well vertex decreases rapidly.This leads to a positive flux flowing into the control domain of an adjacent vertex in an adjacent slice.The storage change of the control domain in this adjacent vertex is positive,and so the potential increases.Hence,the computation of advection fluxes in the finite element method is the cause of the abnormal waterhead phenomenon.关键词
有限单元法/水头反常问题/局部均衡/对流量Key words
finite element method/abnormal waterhead phenomenon/local conservation/advection fluxes分类
天文与地球科学引用本文复制引用
赵颖旺,武强..有限单元法模拟地下水流的水头反常现象——对流量计算的作用[J].水科学进展,2018,29(1):50-56,7.基金项目
国家重点研发计划资助项目(2016YFC0801800) （2016YFC0801800）
北京市自然科学基金资助项目(8162036)The study is financially supported by the National Key R&D Program of China (No.2016YFC0801800) and the Beijing Natural Science Foundation (No.8162036). （8162036）
