Mon Aug 24, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Kelly, C. I., Yang, Dongkai, Ferreira, V. G., Grebby, S., Hancock, C. M., Andam–Akorful, S. A., Jing, Guifei, and Marsh, S., 2026. Resolving Groundwater–Driven Surface Deformation in Upper East Ghana Using Downscaled GRACE and InSAR. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 19:17781–17796, doi:10.1109/JSTARS.2026.3692103.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026IJSTA..1917781K,
author = {{Kelly}, C.~I. and {Yang}, Dongkai and {Ferreira}, V.~G. and {Grebby}, S. and {Hancock}, C.~M. and {Andam-Akorful}, S.~A. and {Jing}, Guifei and {Marsh}, S.},
title = "{Resolving Groundwater-Driven Surface Deformation in Upper East Ghana Using Downscaled GRACE and InSAR}",
journal = {IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing},
keywords = {GRACE downscaling, geographically weighted regression, Ghana, ground deformation, groundwater storage anomaly, InSAR, upper east region},
year = 2026,
month = jan,
volume = {19},
pages = {17781-17796},
abstract = "{Ghana's semiarid Upper East Region (UER) is flooded annually due to
rainfall and dam spillage. Yet the long-term impacts of
hydroclimatic changes on groundwater and their corresponding
effects on land surface stability in the region are unknown. We
combine GRACE data and InSAR to study groundwater-deformation
relationships in the region from June 2018 to August 2021,
following two key preparatory steps. First, we assess the
regional hydrological consistency of the GRACE signal over the
small, data-sparse region (8842 km). Then, using Geographically
Weighted Regression, we downscale GRACE-derived groundwater to a
10-km spatial resolution to enable a detailed spatial analysis
of groundwater-deformation relationships at five selected
locations. Our results reveal increasing groundwater storage
trends ( mm year, mm year; : standard error of the estimate) at
the locations, corresponding to land uplift ( mm year, mm
year). The trends in the two variables are highly correlated (,
), consistent with groundwater recharge in the shallow aquifers
being associated with ground uplift (, , ). Our study adopted a
framework to combine Earth observation (EO) methodologies for
groundwaterdeformation analysis in data-sparse regions at a
finer spatial scale than is possible with native GRACE
observations alone, providing critical information that directly
supports national policies (e.g., for Ghana, the One Village,
One Dam initiative and the construction of the Pwalugu
Multipurpose Dam). While our framework enables an EO-only
approach, we find that combining EO with ground-based
measurements remains vital for comprehensive hydrological
monitoring.}",
doi = {10.1109/JSTARS.2026.3692103},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026IJSTA..1917781K},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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