Global-scale modeling of groundwater recharge
International audience Long-term average groundwater recharge, which is equivalent to renewable groundwater resources, is the major limiting factor for the sustainable use of groundwater. Compared to surface water resources, groundwater resources are more protected from pollution, and their use is l...
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ftccsdartic:oai:HAL:hal-00305174v1 2023-11-12T04:24:37+01:00 Global-scale modeling of groundwater recharge Döll, P. Fiedler, K. Institute of Physical Geography 2008-05-29 https://hal.science/hal-00305174 https://hal.science/hal-00305174/document https://hal.science/hal-00305174/file/hess-12-863-2008.pdf en eng HAL CCSD European Geosciences Union hal-00305174 https://hal.science/hal-00305174 https://hal.science/hal-00305174/document https://hal.science/hal-00305174/file/hess-12-863-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00305174 Hydrology and Earth System Sciences Discussions, 2008, 12 (3), pp.863-885 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2023-10-21T23:10:23Z International audience Long-term average groundwater recharge, which is equivalent to renewable groundwater resources, is the major limiting factor for the sustainable use of groundwater. Compared to surface water resources, groundwater resources are more protected from pollution, and their use is less restricted by seasonal and inter-annual flow variations. To support water management in a globalized world, it is necessary to estimate groundwater recharge at the global scale. Here, we present a best estimate of global-scale long-term average diffuse groundwater recharge (i.e. renewable groundwater resources) that has been calculated by the most recent version of the WaterGAP Global Hydrology Model WGHM (spatial resolution of 0.5° by 0.5°, daily time steps). The estimate was obtained using two state-of-the-art global data sets of gridded observed precipitation that we corrected for measurement errors, which also allowed to quantify the uncertainty due to these equally uncertain data sets. The standard WGHM groundwater recharge algorithm was modified for semi-arid and arid regions, based on independent estimates of diffuse groundwater recharge, which lead to an unbiased estimation of groundwater recharge in these regions. WGHM was tuned against observed long-term average river discharge at 1235 gauging stations by adjusting, individually for each basin, the partitioning of precipitation into evapotranspiration and total runoff. We estimate that global groundwater recharge was 12 666 km 3 /yr for the climate normal 1961?1990, i.e. 32% of total renewable water resources. In semi-arid and arid regions, mountainous regions, permafrost regions and in the Asian Monsoon region, groundwater recharge accounts for a lower fraction of total runoff, which makes these regions particularly vulnerable to seasonal and inter-annual precipitation variability and water pollution. Average per-capita renewable groundwater resources of countries vary between 8 m 3 /(capita yr) for Egypt to more than 1 million m 3 /(capita yr) for ... Article in Journal/Newspaper permafrost Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Döll, P. Fiedler, K. Global-scale modeling of groundwater recharge |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Long-term average groundwater recharge, which is equivalent to renewable groundwater resources, is the major limiting factor for the sustainable use of groundwater. Compared to surface water resources, groundwater resources are more protected from pollution, and their use is less restricted by seasonal and inter-annual flow variations. To support water management in a globalized world, it is necessary to estimate groundwater recharge at the global scale. Here, we present a best estimate of global-scale long-term average diffuse groundwater recharge (i.e. renewable groundwater resources) that has been calculated by the most recent version of the WaterGAP Global Hydrology Model WGHM (spatial resolution of 0.5° by 0.5°, daily time steps). The estimate was obtained using two state-of-the-art global data sets of gridded observed precipitation that we corrected for measurement errors, which also allowed to quantify the uncertainty due to these equally uncertain data sets. The standard WGHM groundwater recharge algorithm was modified for semi-arid and arid regions, based on independent estimates of diffuse groundwater recharge, which lead to an unbiased estimation of groundwater recharge in these regions. WGHM was tuned against observed long-term average river discharge at 1235 gauging stations by adjusting, individually for each basin, the partitioning of precipitation into evapotranspiration and total runoff. We estimate that global groundwater recharge was 12 666 km 3 /yr for the climate normal 1961?1990, i.e. 32% of total renewable water resources. In semi-arid and arid regions, mountainous regions, permafrost regions and in the Asian Monsoon region, groundwater recharge accounts for a lower fraction of total runoff, which makes these regions particularly vulnerable to seasonal and inter-annual precipitation variability and water pollution. Average per-capita renewable groundwater resources of countries vary between 8 m 3 /(capita yr) for Egypt to more than 1 million m 3 /(capita yr) for ... |
author2 |
Institute of Physical Geography |
format |
Article in Journal/Newspaper |
author |
Döll, P. Fiedler, K. |
author_facet |
Döll, P. Fiedler, K. |
author_sort |
Döll, P. |
title |
Global-scale modeling of groundwater recharge |
title_short |
Global-scale modeling of groundwater recharge |
title_full |
Global-scale modeling of groundwater recharge |
title_fullStr |
Global-scale modeling of groundwater recharge |
title_full_unstemmed |
Global-scale modeling of groundwater recharge |
title_sort |
global-scale modeling of groundwater recharge |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00305174 https://hal.science/hal-00305174/document https://hal.science/hal-00305174/file/hess-12-863-2008.pdf |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00305174 Hydrology and Earth System Sciences Discussions, 2008, 12 (3), pp.863-885 |
op_relation |
hal-00305174 https://hal.science/hal-00305174 https://hal.science/hal-00305174/document https://hal.science/hal-00305174/file/hess-12-863-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782339102851465216 |