How low-velocity non-Darcian flow in low-permeability media controls the leakage characteristics of a leaky aquifer system 低渗透介质中低速非达西流如何控制越流含水层系统的越流特性 Comment un écoulement lent non-Darcien se produisant dans des milieux de faible perméabilité contrôle les caractéristiques de drainance d’un système aquifère semi-captif Como o fluxo não-Darciano de baixa velocidade em meios de baixa permeabilidade controla as características de drenagem de um sistema aquífero com drenança Control del flujo no darciano de baja velocidad en medios de baja permeabilidad para determinar las características de filtración en un sistema acuífero permeable

Meng，Xianmeng1; Yan，Ge1; Shen，Lintao1; Yin，Maosheng2; Liu，Dengfeng3

2024

10.1007/s10040-023-02764-w

Hydrogeology Journal   影响因子和分区

1431-2174

1435-0157

The distribution of saline water in the upper aquifer and freshwater in the lower aquifer is a characteristic of groundwater resources in the North China Plain (NCP). The phenomenon of groundwater depression cones in confined aquifers, primarily caused by excessive groundwater extraction, has been extensively documented. In line with Darcy’s law, it is noteworthy that the migration of shallow groundwater into confined aquifers can occur due to a substantial difference in hydraulic head between the unconfined and confined aquifer systems. However, based on the monitoring data, the quality of deep groundwater generally remains good. This paper attempts to explain this phenomenon from the perspective of non-Darcian flow in aquitards. A finite difference method is used to solve low-velocity non-Darcian flow to a well in the NCP. The mathematical model considers the threshold pressure gradient to describe non-Darcian flow in the aquitard and assumes Darcian and horizontal flows for both shallow and confined aquifers. The comparison with traditional Darcian flow indicates that the leaky area decreases rapidly when considering the threshold pressure gradient. The leaky area is negatively correlated with the aquitard thickness and the transmissivity of the confined aquifer, and positively correlated with the pumping rate. The non-Darcian vertical flow velocity is significantly lower than that obtained from Darcian theory. The vertical velocity difference between Darcian and non-Darcian flows is significant under the situation of a small aquitard thickness, large pumping rate, low transmissivity and large leakage coefficient when the threshold pressure gradient is large.

Aquitard Groundwater flow Leaky aquifer Non-Darcian flow Threshold pressure gradient

SCI

英语

其他

GEOSCIENCES

2-s2.0-85182245806

Scopus

1.School of Environmental Studies,China University of Geosciences,Wuhan,430074,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area,School of Water Resources and Hydropower,Xi’an University of Technology,Xi’an,710048,China

Meng，Xianmeng,Yan，Ge,Shen，Lintao,等. How low-velocity non-Darcian flow in low-permeability media controls the leakage characteristics of a leaky aquifer system 低渗透介质中低速非达西流如何控制越流含水层系统的越流特性 Comment un écoulement lent non-Darcien se produisant dans des milieux de faible perméabilité contrôle les caractéristiques de drainance d’un système aquifère semi-captif Como o fluxo não-Darciano de baixa velocidade em meios de baixa permeabilidade controla as características de drenagem de um sistema aquífero com drenança Control del flujo no darciano de baja velocidad en medios de baja permeabilidad para determinar las características de filtración en un sistema acuífero permeable[J]. Hydrogeology Journal,2024.

Meng，Xianmeng,Yan，Ge,Shen，Lintao,Yin，Maosheng,&Liu，Dengfeng.(2024).How low-velocity non-Darcian flow in low-permeability media controls the leakage characteristics of a leaky aquifer system 低渗透介质中低速非达西流如何控制越流含水层系统的越流特性 Comment un écoulement lent non-Darcien se produisant dans des milieux de faible perméabilité contrôle les caractéristiques de drainance d’un système aquifère semi-captif Como o fluxo não-Darciano de baixa velocidade em meios de baixa permeabilidade controla as características de drenagem de um sistema aquífero com drenança Control del flujo no darciano de baja velocidad en medios de baja permeabilidad para determinar las características de filtración en un sistema acuífero permeable.Hydrogeology Journal.

Meng，Xianmeng,et al."How low-velocity non-Darcian flow in low-permeability media controls the leakage characteristics of a leaky aquifer system 低渗透介质中低速非达西流如何控制越流含水层系统的越流特性 Comment un écoulement lent non-Darcien se produisant dans des milieux de faible perméabilité contrôle les caractéristiques de drainance d’un système aquifère semi-captif Como o fluxo não-Darciano de baixa velocidade em meios de baixa permeabilidade controla as características de drenagem de um sistema aquífero com drenança Control del flujo no darciano de baja velocidad en medios de baja permeabilidad para determinar las características de filtración en un sistema acuífero permeable".Hydrogeology Journal (2024).