Thu Aug 14, F. Flechtner
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Orazulike, Chibuike, Xanke, Julian, Hartmann, Andreas, and Chen, Zhao, 2025. Exploring the utility of GRACE measurements for characterizing karst systems at a continental scale. Journal of Hydrology, 651:132578, doi:10.1016/j.jhydrol.2024.132578.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025JHyd..65132578O,
author = {{Orazulike}, Chibuike and {Xanke}, Julian and {Hartmann}, Andreas and {Chen}, Zhao},
title = "{Exploring the utility of GRACE measurements for characterizing karst systems at a continental scale}",
journal = {Journal of Hydrology},
keywords = {GRACE measurements, Karst Hydrogeology, Epikarst, Groundwater recharge and storage, Large-scale hydrology, Euro-Mediterranean karst region},
year = 2025,
month = apr,
volume = {651},
eid = {132578},
pages = {132578},
abstract = "{Groundwater storage in the Euro-Mediterranean karst region has been
detected to be decreasing across approximately
60{\textendash}80\% of its area, yet only a few studies have
attempted to quantify this phenomenon. This study conducts a
spatio-temporal characterization of karst aquifer dynamics on a
continental scale using Gravity Recovery and Climate Experiment
(GRACE) measurements. The groundwater storage anomaly (GWSA) and
subsurface water storage anomaly (SWSA) were computed from GRACE
data, with GWSA representing water storage in the saturated zone
and SWSA encompassing storage in both unsaturated and saturated
zones. We systematically analyzed and compared GWSA and SWSA to
explore groundwater recharge and storage dynamics. The analysis
was complemented by VarKarst model simulations, which represent
potential groundwater recharge in karst terrain, and validated
using spring discharge observations from selected karst
catchments. Trend analysis of both GWSA and the simulated
potential karst groundwater recharge for the period
2002{\textendash}2019 revealed the steepest decline in
groundwater recharge and storage in the Alpine region's polar
climate zone. In temperate climate zones, a strong correlation
was found between SWSA and the simulated potential karst
groundwater recharge when recharge values were timely shifted.
The results highlight the significant role of soil and epikarst
in influencing karst aquifer recharge, particularly in temperate
climates, and demonstrate the spatial suitability of GRACE
satellite data for large-scale karst system characterization.
The observed declining trends in GWSA underscore the importance
of sustainable groundwater management in the Euro-Mediterranean
karst region. Spatial variations in GWSA reflect the impacts of
climate, water use, and characteristic karst properties on
groundwater storage dynamics. This study emphasizes the need to
consider the effects of the epikarst when relating GRACE data to
recharge processes in karst systems. Overall, the integrated
approach combining GRACE measurements, karst groundwater
recharge modeling, climate data, spring discharge observations,
and water use information provides a robust methodology for
characterizing continental-scale karst hydrogeology.}",
doi = {10.1016/j.jhydrol.2024.132578},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025JHyd..65132578O},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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