Mon Oct 13, F. Flechtner
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Walczuk, André, Guimarães Campos, José Eloi, and Santos Batista Teles, Lucas, 2025. Potential and effective recharge of the Federal District shallow aquifers, Brazilian savanna region - coupled analysis of GLDAS-2, Water Table Fluctuation (WTF) and rainfall pattern. Journal of South American Earth Sciences, 156:105426, doi:10.1016/j.jsames.2025.105426.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025JSAES.15605426W,
author = {{Walczuk}, Andr{\'e} and {Guimar{\~a}es Campos}, Jos{\'e} Eloi and {Santos Batista Teles}, Lucas},
title = "{Potential and effective recharge of the Federal District shallow aquifers, Brazilian savanna region - coupled analysis of GLDAS-2, Water Table Fluctuation (WTF) and rainfall pattern}",
journal = {Journal of South American Earth Sciences},
keywords = {Porous aquifer, Cerrado biome, Climate water budget, GRACE, Water table fluctuation, Rainfall, Moving average},
year = 2025,
month = apr,
volume = {156},
eid = {105426},
pages = {105426},
abstract = "{Aquifer recharge is a key parameter for water management. Rainfall
pattern shifts combined with external factors such as vadose
zone properties and evapotranspiration determine groundwater
fluctuation. Different combinations of these variables within
aquifer time response might cause a disequilibrium in water
budget, threatening both surface and groundwater availability.
An important approach to understanding groundwater behavior is
the evaluation of potential and effective recharge considering
multiple methodologies. This study provides an analysis of the
porous aquifer of the Federal District, Brazil. The area is
relevant for national and international water production, as it
hosts the headwaters of three hydrographic regions: Amazonas,
Tocantins-Araguaia, and Paran{\'a}/Paraguay. Potential recharge
estimations and delineation of deficit periods were compiled
from the National Institute of Meteorology (INMET) climatic
network and have been found to be a suitable database to support
rainfall distribution analysis. Effective recharge was estimated
based on the water table fluctuation - WTF method applied to
GLDAS-2/GRACE groundwater storage model (GWS) and water level
time series of five monitoring wells. According to the satellite
data, 22{\textendash}40\% of the corresponding hydrological year
rainfall is converted into saturated zone recharge. Direct
observations estimations are 22{\textendash}48\%. Spearman's
correlation coefficients for GWS and WL are up to 0.90, so that
modeled time series are reliable for trend analysis. A coupled
analysis of climatic and water table data has shown that
groundwater position is well described by moving average
rainfall. Ideal windows were found to be between 150 and 270
days and dependent on groundwater depth, with the latter being
the most representative. The study of Federal District porous
aquifer for management purposes could consider a minimum of
2-year rainfall time series. Maintenance of total volume but
atypical or unevenly distribution along this window has the
potential to alter hydraulic head by the end of the dry season
and the subsequent water table ascension period. Future work at
the Cerrado Biome can consider the methods herein presented to
corroborate research findings and expand the variety of
geomorphological and pedological locations evaluated.}",
doi = {10.1016/j.jsames.2025.105426},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025JSAES.15605426W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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