DBPapers
DOI: 10.5593/SGEM2016/B22/S09.017

ASSESSMENT OF RESULTANT GROUNDWATER CALCULATED ON THE BASIS OF GRACE AND GLDAS MODELS

Z.Rzepecka, M. Birylo, J. Nastula
Thursday 8 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-59-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book2 Vol. 2, 125-132 pp

ABSTRACT
The research is based on the measurement and modeling of Equivalent Water Thickness EWT using information about the Earth geopotential. This information is provided by the GRACE satellite mission (Gravity Recovery and Climate Experiment). High resolution hydrological data from Global Land Data Assimilation (GLDAS) model
makes it possible to separate EWT values onto groundwater, soil moisture and snow
water equivalent. Having EWT from GRACE results and soil moisture together with
snow water equivalent from GLDAS models+, will ensure determination of the ground
water level changes. GLDAS consists of four submodels – NOAH (National Centers for
Environmental Prediction/Oregon State University/Air Force/Hydrologic Research Lab
Model), MOSAIC, VIC (Variable Infiltration Capacity Model) and CLM (Common
Land Surface model). Thus the groundwater changes can be computed from each of
these four models. The aim of the study was to compare the influence of the submodels differences on the obtained groundwater values in Poland. EWT is also often refered to as TWS – Terrestrial (Total) Water Storage.

Keywords: GRACE, GLDAS, EWT, TWS, groundwater level