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Using satellite gravitational and soil moisture measurements for groundwater monitoring and analysis in two different hydroclimatic settings

Authors

Gemitzi,  Alexandra
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Stathopoulos,  Stavros
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zappa,  Luca
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Szostak,  Radoslaw
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wachniew,  Przemyslaw
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Gemitzi, A., Stathopoulos, S., Zappa, L., Szostak, R., Wachniew, P. (2023): Using satellite gravitational and soil moisture measurements for groundwater monitoring and analysis in two different hydroclimatic settings, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3918


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021455
Abstract
The presented work aims at evaluating the potential of using two satellite-derived hydrological variables to describe groundwater levels in two groundwater bodies located in different hydroclimatic conditions, both of which are important sources of water for humans and groundwater dependent ecosystems. Specifically, we employed the Total Water Storage Anomalies (TWSA) from GRACE(-FO) observations and Soil Moisture (SM) from the European Space Agency (ESA) Climate Change Initiative (CCI) to test the hypothesis that groundwater level can be effectively monitored by satellite data. An alluvial aquifer system located in NE Greece (Mediterranean climate) and a fissured-karstic aquifer system in S Poland (humid continental climate), were used to this end. Groundwater records obtained from numerous piezometers across the two study regions were compared with monthly GRACE(-FO) TWSA (Mascon product version 02 from the Jet Propulsion Laboratory), and with monthly CCI SM[lA1] . Results indicated that there is a strong relationship of GRACE(-FO) TWSA with groundwater level changes at the aquifer level in both sites, as expressed by the evaluation of Pearson’s correlation coefficient. Soil moisture is well correlated with groundwater levels in the Greek aquifer which is a shallow semi-confined one that interacts with soil moisture changes in the unsaturated zone. The correlation of soil moisture with groundwater levels was weaker for the significantly thicker Polish aquifer.