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dc.contributorBruggeman, Adrianaen_US
dc.contributorAbdelli, Fethien_US
dc.contributorMohtar, Rabi H.en_US
dc.contributorGabriels, Donalden_US
dc.contributorCornelis, Wimen_US
dc.creatorOuessar, Mohameden_US
dc.identifier.citationMohamed Ouessar, Adriana Bruggeman, Fethi Abdelli, Rabi H. Mohtar, Donald Gabriels, Wim Cornelis. (29/10/2009). Modelling water-harvesting systems in the arid south of Tunisia using SWAT. Hydrology and Earth System Sciences, 13, pp. 2003-2021.en_US
dc.description.abstractIn many arid countries, runoff water-harvesting systems support the livelihood of the rural population. Little is known, however, about the effect of these systems on the water balance components of arid watersheds. The objective of this study was to adapt and evaluate the GIS-based watershed model SWAT (SoilWater Assessment Tool) for simulating the main hydrologic processes in arid environments. The model was applied to the 270-km2 watershed of wadi Koutine in southeast Tunisia, which receives about 200mm annual rain. The main adjustment for adapting the model to this dry Mediterranean environment was the inclusion of waterharvesting systems, which capture and use surface runoff for crop production in upstream subbasins, and a modification of the crop growth processes. The adjusted version of the model was named SWAT-WH. Model evaluation was performed based on 38 runoff events recorded at the Koutine station between 1973 and 1985. The model predicted that the average annual watershed rainfall of the 12-year evaluation period (209 mm) was split into ET (72%), groundwater recharge (22%) and outflow (6%). The evaluation coefficients for calibration and validation were, respectively, R2 (coefficient of determination) 0.77 and 0.44; E (Nash- Sutcliffe coefficient) 0.73 and 0.43; and MAE (Mean Absolute Error) 2.6mm and 3.0 mm, indicating that the model could reproduce the observed events reasonably well. However, the runoff record was dominated by two extreme events, which had a strong effect on the evaluation criteria. Discrepancies remained mainly due to uncertainties in the observed daily rainfall and runoff data. Recommendations for future research include the installation of additional rainfall and runoff gauges with continuous data logging and the collection of more field data to represent the soils and land use. In addition, crop growth and yield monitoring is needed for a proper evaluation of crop production, to allow an economic assessment of the different water uses in the watershed.en_US
dc.publisherEuropean Geosciences Union (EGU)en_US
dc.sourceHydrology and Earth System Sciences;13,(2009) Pagination 2003-2021en_US
dc.subjectwater-harvesting systemsen_US
dc.titleModelling water-harvesting systems in the arid south of Tunisia using SWATen_US
dc.typeJournal Articleen_US
cg.subject.agrovocarid soilsen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerArid Regions Institute - IRAen_US
cg.contributor.centerPurdue Universityen_US
cg.contributor.centerGhent University - GUen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionNorthern Africaen_US
cg.isijournalISI Journalen_US
dc.identifier.statusOpen accessen_US
cg.journalHydrology and Earth System Sciencesen_US

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