Leaky Aquifer Models to Simulate the Well Flow in Fractured Aquifers with Linear Interporosity Flow

Abstract

Following Hemker and Maas (1987) the models of two or three leaky aquifers are applied to simulate the flow to vertical wells operating in the fractured or dual porosity aquifers. The software WellTest (WT) (Székely 2015) is used for calculating the drawdown and discharge rate variation. The comparative analysis with the independent analytical solutions by Boulton and Streltsova‐Adams (1978), Warren and Root (1963), Kazemi et al. (1969) concluded with acceptable agreement between the WT simulation and the alternate calculation methods. The selected field tests have been conducted in fractured limestone aquifers. The pumping test west of Copenhagen shows an example of fractured aquifer with considerable negative skin effect at the well face. The flowing well Wafra W1 in Kuwait operates in the two‐zone aquifer exhibiting sufficient vertical recharge via leakage beyond a circular domain of estimated radius of 2460 m.

Verification of Radiocarbon Transport Predicted by Numerical Modeling in the Porous Formation of NE Hungary Considering Paleo-Hydrogeology

“…The transport modeling of radiocarbon ( 14 C) isotope requires groundwater flow modeling to define the flow velocity field responsible for the advective displacement of water and dissolved species. The FS (Flow-Solute) software developed by Székely (1990) was used for modeling the groundwater flow system using Finite Difference scheme. This steady-state groundwater flow model (Székely 2006) assumes (1) the previously described hydrostratigraphic model, (2) the shallow groundwater table elevation as the fixed head upper boundary condition, and (3) presumably no-flow lateral boundaries in model layers 2–5.…”

“…The numerical FS (Flow-Solute) software by Székely (1990) uses the Finite Difference method to simulate the following processes: steady-state flow, recharge-discharge, advection, mixing, adsorption, desorption, and radioactive decay. Heterogeneous, multilayered aquifer systems are considered.…”

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Figure 4Numerical transport modeling of the 1D radioactive tracer transport using the FS software (Székely 1990).

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“…The main goal of the paper is to present the results of a steady-state groundwater flow model (Székely 2006) verification by radiocarbon ( 14 C) data, taking into consideration these paleo-hydrogeological changes. The FS (Flow-Solute) software developed by Székely (1990) was successfully used for modeling the present hydrogeological conditions of the groundwater flow system.…”

“…Many of these uncertainties can be reduced by modeling the raw 14 C data instead of groundwater ages (Suckow 2014; Siade et al 2018), therefore we modeled 14 C content of groundwater and compared to the observed and δ 13 C corrected 14 C data (see section “δ 13 C Correction of 14 C Data”). The numerical FS software of Székely (1990) simulates mixing, adsorption and desorption in addition to radioactive decay (t 1/2 =5730 a) at modeling of 14 C content.…”