Effect of depth-dependent hydraulic conductivity and anisotropy on transit time distributions

Rumynin, Vyacheslav G.; Leskova, P.G.; Sindalovskiy, Leonid N.; Nikulenkov, A. M.

doi:10.1016/j.jhydrol.2019.124161

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…The gradual decline in K with depth and length is a hallmark of piedmont alluvial fan hydrogeology [17,19], which influences features of subsurface flow such as the distribution of path lines, velocity, and residence time along these path lines. Depth-dependent K is a manifestation of regional-scale heterogeneity and was widely observed in the geological medium [20,[35][36][37]49]. Different relationships of K with depth have been fitted in different sites with different K range, for example, the power function [23], logistic function [23], and exponential function [33].…”

Section: Discussionmentioning

confidence: 99%

“…Regression analysis has also been used to study the statistical distribution of K in different sites and has shown that the variation of K with depth could be described by different functions, such as power function [23], logistic function [23], and exponential function [33]. The systematic decrease in K with depth has been proven to affect various features of subsurface flow such as the flow paths, velocity, travel times, and RTDs [20,[34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…The effects of human activities on groundwater flow features, such as groundwater pumping, artificial recharge, and urbanization, have been studied in recent research [15,[41][42][43]. Many other investigations, including field studies and numerical simulations, have been carried out to examine the pattern of groundwater flow under the depth-decaying K, showing that regional flow systems, solute transport, flow paths, and RTDs are sensitive to the depthdecaying behavior of K [20,[34][35][36][37]44]. While these studies generated important insights into the groundwater flow behavior under depth-decaying K or human activities, none of them considered the effects of systematic decrease in K along the length from the apex to apron (length-dependent hydraulic conductivity) on groundwater flow in alluvial fan areas and the combined effects of artificial recharge and decaying K, which have been widely observed in geological formations because of the specific depositional environment.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Decaying Hydraulic Conductivity on the Groundwater Flow Processes in a Managed Aquifer Recharge Area in an Alluvial Fan

Zhang

Chang

et al. 2021

Water

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Groundwater artificial recharge and medium characteristics represent the major factors in controlling the groundwater flow processes in managed aquifer recharge areas. According to the depositional features of alluvial fans, an analogous homogeneous phreatic sand tank aquifer and the corresponding inhomogeneous scale numerical models were established to investigate the groundwater flow under the combined influence of artificial recharge (human activities) and decaying hydraulic conductivity (medium characteristics). In this study, groundwater flow through a managed aquifer recharge area in an alluvial fan was analyzed under the conditions of decaying hydraulic conductivity (K) with depth or length from apex to apron. The results showed that groundwater flow processes induced by artificial recharge were significantly controlled by the increasing decay exponents of K. The decaying K with depth or length in alluvial fan areas expanded the degree of influence of artificial recharge on groundwater flow. With the increase of decay exponents, the flow directions gradually changed from a horizontal to vertical direction. Groundwater age and spatial variability could also be increased by the increasing decay exponents. The residence time distributions (RTDs) of ambient groundwater and artificially recharged water exhibited logarithmic, exponential, and power law behavior. Penetration depth and travel times of ambient groundwater flow could be affected by artificial recharge and decay exponents. Furthermore, with the increase of decay exponents, the thickness of the artificially recharged water lens and travel times of artificially recharged water were increased. These findings have important implications for the performance of managed aquifer recharge in alluvial fan areas as well as the importance of considering the gradual decrease of K with depth and length.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Decaying Hydraulic Conductivity on the Groundwater Flow Processes in a Managed Aquifer Recharge Area in an Alluvial Fan

Zhang

Chang

et al. 2021

Water

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“…Moreover, the space-dependent hydraulic conductivity model exhibits different hydraulic conductivity at different depths in the fault fracture zone based on the site investigation [26][27][28], as shown in Fig. 8.…”

Section: Modified Water Inflow Considering Depth Effect On Hydraulic ...mentioning

confidence: 99%

Numerical-Analytical Method for Predicting Water Inflow into the Tunnel through Conductive Fault Fracture Zone

Wang¹,

Liu²,

Tu³

et al. 2023

Pol. J. Environ. Stud.

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Water inrush is commonly encountered while tunnelling through a conductive fault fracture zone, and seriously affects the hydrogeological environment around the tunnel. This paper proposed a new method to predict water inflow during the water inrush. Firstly, a unified time-dependent constitutive model considering Darcy flow and non-Darcy flow in the fault fracture zone was established, and the numerical time-variant water inflow was analyzed. Secondly, the analytical prediction of time-variant water inflow was conducted, which was compared with the numerical results and the measured data. The numerical and analytical prediction method was found to be reliable for the water inflow into the tunnel through the conductive fault fracture zone. On this basis, a combined numerical-analytical method for predicting water inflow was proposed and a reasonable prediction range of water inflow was constructed. Furthermore, the modified time-variant water inflow prediction method was developed by incorporating the temporal and spatial variation in the hydraulic conductivity. The modified prediction range of water inflow can be more consistent with the measured water inflow. The results show that the prediction accuracy of water inflow can be improved by considering the depth effect of hydraulic conductivity in the fault fracture zone for this typical case.

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Effect of anisotropy and depth-dependent hydraulic conductivity on concentration curve response to nonpoint-source pollution

Rumynin

Sindalovskiy

Nikulenkov

et al. 2020

Journal of Hydrology

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Effect of depth-dependent hydraulic conductivity and anisotropy on transit time distributions

Cited by 9 publications

References 31 publications

Effects of Decaying Hydraulic Conductivity on the Groundwater Flow Processes in a Managed Aquifer Recharge Area in an Alluvial Fan

Effects of Decaying Hydraulic Conductivity on the Groundwater Flow Processes in a Managed Aquifer Recharge Area in an Alluvial Fan

Numerical-Analytical Method for Predicting Water Inflow into the Tunnel through Conductive Fault Fracture Zone

Effect of anisotropy and depth-dependent hydraulic conductivity on concentration curve response to nonpoint-source pollution

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