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Towards a computationally efficient free-surface groundwater flow boundary condition for large-scale hydrological modelling

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Towards a computationally efficient free-surface groundwater flow boundary condition for large-scale hydrological modelling. / Mostaquimur Rahman, A S M; Rosolem, R.; Kollet, S. J.; Wagener, T.

In: Advances in Water Resources, Vol. 123, 01.2019, p. 225-233.

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@article{fdc7f1f8033c49419cb8e7451a35aadf,
title = "Towards a computationally efficient free-surface groundwater flow boundary condition for large-scale hydrological modelling",
abstract = "Shallow groundwater is a critical component of the terrestrial water cycle. It sustains baseflow in rivers, supplies root zones with soil moisture during dry periods, and directly influences the land-atmosphere exchange processes. Nonetheless, the integration of groundwater into large-scale hydrological models remains challenging. The most detailed way of representing groundwater dynamics is to incorporate three-dimensional, variably saturated flow processes in the subsurface representation of hydrological models. However, such detailed modelling is still a challenge for global hydrological applications, mainly due to its high computational demand. In this study, a free-surface boundary condition called the Groundwater Flow Boundary (GFB) is developed to represent groundwater dynamics in a more computationally-efficient manner than the full three-dimensional models do. We evaluate GFB using two synthetic test cases, namely an infiltration experiment and a tilted-v catchment, which focus on groundwater recharge and discharge processes, respectively. The simulation results from GFB are compared with a three-dimensional groundwater flow model and with an over-simplified approach using a free-drainage lower boundary condition to assess the impact of our assumptions on model results. We demonstrate that GFB is computationally more efficient compared to the three-dimensional model with limited loss in model performance when simulating infiltration and runoff dynamics.",
author = "{Mostaquimur Rahman}, {A S M} and R. Rosolem and Kollet, {S. J.} and T. Wagener",
year = "2019",
month = "1",
doi = "10.1016/j.advwatres.2018.11.015",
language = "English",
volume = "123",
pages = "225--233",
journal = "Advances in Water Resources",
issn = "0309-1708",
publisher = "Elsevier Masson SAS",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Towards a computationally efficient free-surface groundwater flow boundary condition for large-scale hydrological modelling

AU - Mostaquimur Rahman, A S M

AU - Rosolem, R.

AU - Kollet, S. J.

AU - Wagener, T.

PY - 2019/1

Y1 - 2019/1

N2 - Shallow groundwater is a critical component of the terrestrial water cycle. It sustains baseflow in rivers, supplies root zones with soil moisture during dry periods, and directly influences the land-atmosphere exchange processes. Nonetheless, the integration of groundwater into large-scale hydrological models remains challenging. The most detailed way of representing groundwater dynamics is to incorporate three-dimensional, variably saturated flow processes in the subsurface representation of hydrological models. However, such detailed modelling is still a challenge for global hydrological applications, mainly due to its high computational demand. In this study, a free-surface boundary condition called the Groundwater Flow Boundary (GFB) is developed to represent groundwater dynamics in a more computationally-efficient manner than the full three-dimensional models do. We evaluate GFB using two synthetic test cases, namely an infiltration experiment and a tilted-v catchment, which focus on groundwater recharge and discharge processes, respectively. The simulation results from GFB are compared with a three-dimensional groundwater flow model and with an over-simplified approach using a free-drainage lower boundary condition to assess the impact of our assumptions on model results. We demonstrate that GFB is computationally more efficient compared to the three-dimensional model with limited loss in model performance when simulating infiltration and runoff dynamics.

AB - Shallow groundwater is a critical component of the terrestrial water cycle. It sustains baseflow in rivers, supplies root zones with soil moisture during dry periods, and directly influences the land-atmosphere exchange processes. Nonetheless, the integration of groundwater into large-scale hydrological models remains challenging. The most detailed way of representing groundwater dynamics is to incorporate three-dimensional, variably saturated flow processes in the subsurface representation of hydrological models. However, such detailed modelling is still a challenge for global hydrological applications, mainly due to its high computational demand. In this study, a free-surface boundary condition called the Groundwater Flow Boundary (GFB) is developed to represent groundwater dynamics in a more computationally-efficient manner than the full three-dimensional models do. We evaluate GFB using two synthetic test cases, namely an infiltration experiment and a tilted-v catchment, which focus on groundwater recharge and discharge processes, respectively. The simulation results from GFB are compared with a three-dimensional groundwater flow model and with an over-simplified approach using a free-drainage lower boundary condition to assess the impact of our assumptions on model results. We demonstrate that GFB is computationally more efficient compared to the three-dimensional model with limited loss in model performance when simulating infiltration and runoff dynamics.

UR - http://www.scopus.com/inward/record.url?scp=85057736258&partnerID=8YFLogxK

U2 - 10.1016/j.advwatres.2018.11.015

DO - 10.1016/j.advwatres.2018.11.015

M3 - Article

AN - SCOPUS:85057736258

VL - 123

SP - 225

EP - 233

JO - Advances in Water Resources

JF - Advances in Water Resources

SN - 0309-1708

ER -