FEFLOW: A Finite‐Element Ground Water Flow and Transport Modeling Tool

Trefry, M. G.; Muffels, Chris

doi:10.1111/j.1745-6584.2007.00358.x

Cited by 176 publications

(70 citation statements)

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“…For the current case, the specific storage is neglectable against the drainable porosity, because of unconfined conditions. Equation (15) is solved with the finite element method using the groundwater flow simulation program Feflow [18,19]. For the current model, the flow equations are solved in three dimensions, but boundary conditions are set in such a way that there is no velocity component perpendicular to the cross-section, so the model is in principle a two-dimensional vertical model.…”

Section: The Groundwater Modelmentioning

confidence: 99%

“…We review this bank storage event in Section 3. In Section 4, we describe a groundwater model that we set up for the Ubell bank storage event with the flow simulation program Feflow (see [18,19]). The water exchange between river and aquifer is modeled with a head boundary condition and a leakage boundary condition, which leads to two model variants.…”

Section: Introductionmentioning

confidence: 99%

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On the Modeling of Bank Storage in a Groundwater Model: The April, 1983, Flood Event in the Neuwieder Becken (Middle Rhine)

Becker

Jansen

Sinaba

et al. 2015

Water

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For predictive numerical simulations of subsurface floods (groundwater head rise due to high water in a contiguous river), it is important to know how to represent the bank storage process in a numerical groundwater model. Whilst leakage approaches are frequently used for modeling bank storage, another option is the application of a head boundary condition. In order to get a better understanding of the bank storage process, we analyze the bank storage event in the Neuwieder Becken (Middle Rhine) in April 1983, which has been reported by . We found the leakage function to be nonlinear and hysteretic. The evaluation of different model variants for Ubell's bank storage event shows that both a head boundary condition and a leakage boundary condition are appropriate modeling approaches. For practical reasons, the leakage boundary condition is preferred. A linear leakage function represents the bank storage process for the analyzed event sufficiently. A hysteretic course of the leakage function can be achieved in a three-dimensional groundwater model by layering the hydraulic soil properties in the vicinity of the bank.

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Section: The Groundwater Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Modeling of Bank Storage in a Groundwater Model: The April, 1983, Flood Event in the Neuwieder Becken (Middle Rhine)

Becker

Jansen

Sinaba

et al. 2015

Water

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show abstract

“…There are different methods used to solve flow and solute problems and usually these problems must be solved numerically [18]. Theoretical numerical models are used, such as FEFLOW, which is an advanced finite element subsurface flow and transport modeling system with an extensive list of functionalities [19]. Zhang et al estimated a simultaneous velocity vector and water pressure head which can be used as direct input to transport models [8].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Total Nitrogen Transport in Riparian Buffer in an Agricultural Watershed

Lin

Tang

et al. 2016

Sustainability

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Riparian buffers can influence water quality in downstream lakes or rivers by buffering non-point source pollution in upstream agricultural fields. With increasing nitrogen (N) pollution in small agricultural watersheds, a major function of riparian buffers is to retain N in the soil. A series of field experiments were conducted to monitor pollutant transport in riparian buffers of small watersheds, while numerical model-based analysis is scarce. In this study, we set up a field experiment to monitor the retention rates of total N in different widths of buffer strips and used a finite element model (HYDRUS 2D/3D) to simulate the total N transport in the riparian buffer of an agricultural non-point source polluted area in the Liaohe River basin. The field experiment retention rates for total N were 19.4%, 26.6%, 29.5%, and 42.9% in 1,3,4, and 6m-wide buffer strips, respectively. Throughout the simulation period, the concentration of total N of the 1mwide buffer strip reached a maximum of 1.27 mg/cm 3 at 30 min, decreasing before leveling off. The concentration of total N about the 3mwide buffer strip consistently increased, with a maximum of 1.05 mg/cm 3 observed at 60 min. Under rainfall infiltration, the buffer strips of different widths showed a retention effect on total N transport, and the optimum effect was simulated in the 6mwide buffer strip. A comparison between measured and simulated data revealed that finite element simulation could simulate N transport in the soil of riparian buffer strips.

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“…Most numerical models are optimized to solve contaminant transport problems in either the vadose or groundwater zone, however, models have been proposed which couple transport in both zones (Weill et al, 2009;Panday and Huyakorn, 2008;Twarakavi et al, 2008;Trefry and Muffels, 2007). For pesticide transport, one-dimensional vadose zone models and three-dimensional groundwater models have been coupled and applied at local (Stenemo et al, 2005;Jorgensen et al, 2004) and regional scales (Herbst et al, 2005;Christiansen et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

Bergvall

Grip

Sjöström

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Few studies have been carried out that cover the entire transport process of pesticides, from application at the soil surface, through subsurface transport, to contamination of drinking water in esker aquifers. In formerly glaciated regions, such as Scandinavia, many of the most important groundwater resources are situated in glaciofluvial eskers. The purpose of the present study was to model and identify significant processes that govern subsurface transport of pesticides in extensive glaciofluvial and littoral sediments. To simulate the transport processes, we coupled a vadose zone model at soil profile scale to a regional groundwater flow model. The model was applied to a municipal drinking-water aquifer, contaminated with the pesticide-metabolite BAM (2,6-dichlorobenzoamide). At regional scale, with the combination of a ten-meter-deep vadose zone and coarse texture, the observed concentrations could be described by the model without assuming preferential flow. A sensitivity analysis revealed that hydraulic conductivity in the aquifer and infiltration rate accounted for almost half of the model uncertainty. The calibrated model was applied to optimize the location of extraction wells for remediation, which were used to validate the predictive modeling. Running a worst-case scenario, the model showed that the establishment of two remediation wells would clean the aquifer in four years, compared to nine years without them. Further development of the model would require additional field measurements in order to improve the description of macrodispersion in deep, sandy vadose zones. We also suggest that future research should focus on characterization of the variability of hydraulic conductivity and its effect on contaminant transport in eskers.

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FEFLOW: A Finite‐Element Ground Water Flow and Transport Modeling Tool

Cited by 176 publications

References 1 publication

On the Modeling of Bank Storage in a Groundwater Model: The April, 1983, Flood Event in the Neuwieder Becken (Middle Rhine)

On the Modeling of Bank Storage in a Groundwater Model: The April, 1983, Flood Event in the Neuwieder Becken (Middle Rhine)

Finite Element Simulation of Total Nitrogen Transport in Riparian Buffer in an Agricultural Watershed

Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

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