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International Institute for Geo-Information Science and Earth Observation (ITC) 2017

Scaling up Sardon Catchment groundwater recharge into Dehesa (Montado) hard rocks of Iberian peninsula

Tekle, Y.W. (Yonas Welday)

Titre : Scaling up Sardon Catchment groundwater recharge into Dehesa (Montado) hard rocks of Iberian peninsula

Auteur : Tekle, Y.W. (Yonas Welday)

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2017

Résumé
Groundwater in water -limited hard rock environments of the Iberian Peninsula, is a vital resource and its recharge assessment is important in the analysis of water resources replenishment. The recharge assessment is difficult due to heterogeneities and anisotropies of such aquifers and due to large spatiotemporal variabi lity of rainfall and evapotranspiration. This study aimed at scaling up daily net recharge ( Rn) of the pilot Sardon Catchment (SC) area (80 km2) into the large water limited Dehesa- Montado Hard Rock (DMHR) area (141,430 km2), with combination of satellite - based daily rainfall ( Psat ) and daily evapotranspiration ( ETsat ). The remote sensing Psat was obtained from Climate Hazards Group InfraRed Precipitation with Station Data (CHIRPS) while the remote sensing ETsat from Land Surface Analysis Satellite Applica tion Facility ( LSA- SAF ). The Rn for scaling up was derived by updating the existing transient calibrated SC model applying spatiotemporally variable model inputs (year 2011 to 2013), and a similar simulation that has been tested for the year 2014. Various correlations between Rn and different combinations of satellite - based water fluxes ( Psat , ETsat ) or potential recharge (PR = Psat - ETsat ) were tested. The daily Rn was scaled up from SC into DMHR area by applying a multivariate nonlinear regres sion with Psat and ETsat . That regression resulted in R 2 = 0.63. The scaled, spatiotemporally variable Rn of the DMHR area has high spatiotemporal variability. The mean annual Rn in years 2011 to 2014 ranges from - 3.9 mm year- 1 to 35.3 mm year- 1 . Spatially , the Rn generally increase from east to west and is the lowest in the southern parts of the study area mainly because the rainfall is the lowest in that area. The dry season Rn is generally negative , ranging from - 28.4 mm to - 23.9 mm. The wet season Rn is positive ranging from 5 9.2 mm to 24.5 mm. This revealed that the Rn in the DMHR is generally low, and it occurs in the wet season.

Mots clés : Hard rocks, dehesa (montado), Iberian Peninsula, groundwater, spatiotemporal recharge, transient model simulation , scaling up , net recharge, groundwater fluxes, and satellite- based flux inputs

Version intégrale (ITC)

Page publiée le 29 janvier 2018