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@ARTICLE{Diouf:875310,
author = {Diouf, Ousmane Coly and Weihermüller, Lutz and Diedhiou,
Mathias and Vereecken, Harry and Faye, Seynabou Cissé and
Faye, Sérigne and Sylla, Samba Ndao},
title = {{M}odelling groundwater evapotranspiration in a shallow
aquifer in a semi-arid environment},
journal = {Journal of hydrology},
volume = {587},
issn = {0022-1694},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2020-01941},
pages = {124967 -},
year = {2020},
abstract = {The use of diurnal or seasonal water table fluctuation
(WTF) to estimate groundwater evapotranspiration (ETG) at
different land uses and climate conditions is increasing
applied in ecohydrological studies. In this study, we
applied the WTF method for a shallow aquifer in an urbanized
area in Senegal over the dry season 2000–2013.To analyze
the applicability and validity of the WTF method for this
site, and to understand the impact of the parameters used in
this method, the unsaturated /saturated system was first
simulated using the HYDRUS 1D model. The drawdown of the
water table ranges from 18.1 to 113.2 cm and 10.4 to 101.9
cm for a bare soil and a perennial grass scenario and is
highly related to the annual rainfall of the previous rainy
season. The results indicate that the mean daily FAO-PM
reference evapotranspiration rates for this area ranged from
2 to 4 mmd−1 and that the estimated actual
evapotranspiration (ETa) from the HYDRUS 1D model ranged
between 0.22 to 1.11 and 0.23 to 1.27 mmd−1 in bare soil
and vegetative condition, respectively. ETa and ETG were
well correlated for the vegetated scenario. However, the WTF
method slightly overestimates ETa fluxes in the bare soil
scenario. The study shows that the decline of ETa with water
table depth can be simulated by an exponential function. The
overall results indicate that higher ETa values were
observed when the water table is shallow, suggesting that
ETa is mainly driven by the water table depth at this site.},
cin = {IBG-3},
ddc = {690},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000568819100061},
doi = {10.1016/j.jhydrol.2020.124967},
url = {https://juser.fz-juelich.de/record/875310},
}