Scale-dependent parameterization of groundwater–surface water interactions in a regional hydrogeological model

Research output: Contribution to journalArticlepeer-review

Standard

Scale-dependent parameterization of groundwater–surface water interactions in a regional hydrogeological model. / Di Ciacca, Antoine; Leterme, Bertrand; Laloy, Eric; Jacques, Diederik; Vanderborght, Jan.

In: Journal of Hydrology, Vol. 576, 27.06.2019, p. 494-507.

Research output: Contribution to journalArticlepeer-review

Bibtex - Download

@article{cc1945450d364aed9bb5f64859f5335f,
title = "Scale-dependent parameterization of groundwater–surface water interactions in a regional hydrogeological model",
abstract = "In regional hydrogeological models groundwater–surface water interaction is generally represented with a Cauchy boundary condition, in which a conductance parameter governs the exchange flux rate. In some models, the conductance is controlled by the streambed properties, since it has generally a lower hydraulic conductivity than the aquifer. However, depending on the specific system and the spatial discretization of the hydrogeological model, aquifer conductance can be a limiting factor for groundwater–surface water interactions. The present study introduces a new expression to represent the aquifer conductance as a function of aquifer properties, surface water network density and model discretization. This expression is based on the Dupuit-Forcheimer theory, the Ernst equation and vertical 2D numerical experiments at the field scale. The main assumptions used to derive our formulation are the presence of a no-flow boundary at the bottom of the hydrogeological model and the homogeneity of the aquifer. The expression is evaluated using simulations with 3D hydrogeological models at different spatial resolutions and compared against previously published parameterization approaches. The results show that the new expression outperforms the other approaches by capturing accurately both the gridsize and the surface water network density dependency of the conductance, which is caused by pressure head losses due to flow within the aquifer grid cell to the surface water, without any additional numerical calculation. Moreover, the proposed expression can be implemented directly in hydrogeological models thereby improving current approaches to represent groundwater–surface water interactions in regional hydrogeological models.",
keywords = "Groundwater−surface water interactions, Hydrogeological modelling, Aquifer conductance, Upscaling, Drainage network",
author = "{Di Ciacca}, Antoine and Bertrand Leterme and Eric Laloy and Diederik Jacques and Jan Vanderborght",
note = "Score=10",
year = "2019",
month = jun,
day = "27",
doi = "10.1016/j.jhydrol.2019.06.072",
language = "English",
volume = "576",
pages = "494--507",
journal = "Journal of Hydrology",
issn = "0022-1694",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Scale-dependent parameterization of groundwater–surface water interactions in a regional hydrogeological model

AU - Di Ciacca, Antoine

AU - Leterme, Bertrand

AU - Laloy, Eric

AU - Jacques, Diederik

AU - Vanderborght, Jan

N1 - Score=10

PY - 2019/6/27

Y1 - 2019/6/27

N2 - In regional hydrogeological models groundwater–surface water interaction is generally represented with a Cauchy boundary condition, in which a conductance parameter governs the exchange flux rate. In some models, the conductance is controlled by the streambed properties, since it has generally a lower hydraulic conductivity than the aquifer. However, depending on the specific system and the spatial discretization of the hydrogeological model, aquifer conductance can be a limiting factor for groundwater–surface water interactions. The present study introduces a new expression to represent the aquifer conductance as a function of aquifer properties, surface water network density and model discretization. This expression is based on the Dupuit-Forcheimer theory, the Ernst equation and vertical 2D numerical experiments at the field scale. The main assumptions used to derive our formulation are the presence of a no-flow boundary at the bottom of the hydrogeological model and the homogeneity of the aquifer. The expression is evaluated using simulations with 3D hydrogeological models at different spatial resolutions and compared against previously published parameterization approaches. The results show that the new expression outperforms the other approaches by capturing accurately both the gridsize and the surface water network density dependency of the conductance, which is caused by pressure head losses due to flow within the aquifer grid cell to the surface water, without any additional numerical calculation. Moreover, the proposed expression can be implemented directly in hydrogeological models thereby improving current approaches to represent groundwater–surface water interactions in regional hydrogeological models.

AB - In regional hydrogeological models groundwater–surface water interaction is generally represented with a Cauchy boundary condition, in which a conductance parameter governs the exchange flux rate. In some models, the conductance is controlled by the streambed properties, since it has generally a lower hydraulic conductivity than the aquifer. However, depending on the specific system and the spatial discretization of the hydrogeological model, aquifer conductance can be a limiting factor for groundwater–surface water interactions. The present study introduces a new expression to represent the aquifer conductance as a function of aquifer properties, surface water network density and model discretization. This expression is based on the Dupuit-Forcheimer theory, the Ernst equation and vertical 2D numerical experiments at the field scale. The main assumptions used to derive our formulation are the presence of a no-flow boundary at the bottom of the hydrogeological model and the homogeneity of the aquifer. The expression is evaluated using simulations with 3D hydrogeological models at different spatial resolutions and compared against previously published parameterization approaches. The results show that the new expression outperforms the other approaches by capturing accurately both the gridsize and the surface water network density dependency of the conductance, which is caused by pressure head losses due to flow within the aquifer grid cell to the surface water, without any additional numerical calculation. Moreover, the proposed expression can be implemented directly in hydrogeological models thereby improving current approaches to represent groundwater–surface water interactions in regional hydrogeological models.

KW - Groundwater−surface water interactions

KW - Hydrogeological modelling

KW - Aquifer conductance

KW - Upscaling

KW - Drainage network

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34772747

U2 - 10.1016/j.jhydrol.2019.06.072

DO - 10.1016/j.jhydrol.2019.06.072

M3 - Article

VL - 576

SP - 494

EP - 507

JO - Journal of Hydrology

JF - Journal of Hydrology

SN - 0022-1694

ER -

ID: 5409805