Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources

Abstract Global water resource assessment has been conducted primarily for surface water and shallow groundwater (unconfined aquifers). Groundwater is a major water resource worldwide. Nevertheless, future water resource assessment integrating surface water and groundwater has not been carried out a...

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Autores principales:	Yosuke Miura, Kei Yoshimura
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2020
Materias:	Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/56905d986f8246448b33419c98a8b342
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spelling	oai:doaj.org-article:56905d986f8246448b33419c98a8b3422021-11-15T14:20:27ZDevelopment and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources1942-246610.1029/2020MS002093https://doaj.org/article/56905d986f8246448b33419c98a8b3422020-08-01T00:00:00Zhttps://doi.org/10.1029/2020MS002093https://doaj.org/toc/1942-2466Abstract Global water resource assessment has been conducted primarily for surface water and shallow groundwater (unconfined aquifers). Groundwater is a major water resource worldwide. Nevertheless, future water resource assessment integrating surface water and groundwater has not been carried out at the global scale. Large grid sizes are used in global‐scale models due to computer resource constraints. Underground, the unsaturated zone that connects surface water and groundwater is expressed using a vertically one‐dimensional grid of fixed size. However, the thickness of the unsaturated zone varies greatly between dry and humid areas, and future unsaturated zone conditions may differ from those at present due to climate change. In addition, for mountainous areas with steep slopes, representing the unsaturated zone in one vertical dimension is a major limitation. We believe that such a representation causes difficulty in adequately expressing underground water flow and thus introduces uncertainties into future prediction results. In this study, we developed a code to represent variably saturated flow with groundwater storativity in three dimensions based on physical equations, which can be used as references for parameterization in the future. To confirm the accuracy of this code, we verified it using vertical one‐ and two‐dimensional infiltration problems, a three‐dimensional groundwater pumping problem, hillslope problem, and water balance. The code achieved reliable results for each problem.Yosuke MiuraKei YoshimuraAmerican Geophysical Union (AGU)articlePhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 12, Iss 8, Pp n/a-n/a (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	Physical geography GB3-5030 Oceanography GC1-1581 Yosuke Miura Kei Yoshimura Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
description	Abstract Global water resource assessment has been conducted primarily for surface water and shallow groundwater (unconfined aquifers). Groundwater is a major water resource worldwide. Nevertheless, future water resource assessment integrating surface water and groundwater has not been carried out at the global scale. Large grid sizes are used in global‐scale models due to computer resource constraints. Underground, the unsaturated zone that connects surface water and groundwater is expressed using a vertically one‐dimensional grid of fixed size. However, the thickness of the unsaturated zone varies greatly between dry and humid areas, and future unsaturated zone conditions may differ from those at present due to climate change. In addition, for mountainous areas with steep slopes, representing the unsaturated zone in one vertical dimension is a major limitation. We believe that such a representation causes difficulty in adequately expressing underground water flow and thus introduces uncertainties into future prediction results. In this study, we developed a code to represent variably saturated flow with groundwater storativity in three dimensions based on physical equations, which can be used as references for parameterization in the future. To confirm the accuracy of this code, we verified it using vertical one‐ and two‐dimensional infiltration problems, a three‐dimensional groundwater pumping problem, hillslope problem, and water balance. The code achieved reliable results for each problem.
format	article
author	Yosuke Miura Kei Yoshimura
author_facet	Yosuke Miura Kei Yoshimura
author_sort	Yosuke Miura
title	Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
title_short	Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
title_full	Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
title_fullStr	Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
title_full_unstemmed	Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources
title_sort	development and verification of a three‐dimensional variably saturated flow model for assessment of future global water resources
publisher	American Geophysical Union (AGU)
publishDate	2020
url	https://doaj.org/article/56905d986f8246448b33419c98a8b342
work_keys_str_mv	AT yosukemiura developmentandverificationofathreedimensionalvariablysaturatedflowmodelforassessmentoffutureglobalwaterresources AT keiyoshimura developmentandverificationofathreedimensionalvariablysaturatedflowmodelforassessmentoffutureglobalwaterresources
_version_	1718428375878467584

Development and Verification of a Three‐Dimensional Variably Saturated Flow Model for Assessment of Future Global Water Resources

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