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ISSN : 2456-8643

Title:
ASSESSING THE EFFECT OF LAND USE AND LAND COVER CHANGES ON WATER BALANCE IN THE OURIYORI BASIN (BENIN, WEST AFRICA)

Authors:
Quentin Fiacre Togbevi *, Sophie Thiam , Maurice D. Ahouansou and Luc O. Sintondji ,Benin

Abstract:
This study assessed the hydrological impacts of LULC changes on water resources in the Ouriyori basin, Benin. Two LULC data (1988 and 2016) and Soil and Water Assessment Tool (SWAT) model was used for the hydrological modelling. Sequential uncertainty fitting (SUFI-2) algorithm in SWAT-CUP has been applied for the model calibration and uncertainty analysis. Also, daily climate data and streamflow including digital elevation model, soil characteristics were considered in the model. Climate data for the entire simulation period and the soil datasets being kept constant, the model was run using the land use maps separately. LULC analysis showed that cropland and settlement areas have increased, while savanna areas have decreased from 1988 to 2016. Calibration (2014-2015) and validation (2016-2017) of the simulated streamflow at the basin outlet were achieved with good performance statistics ranging from 0.67 to 0.89 for the R 2 , NSE, KGE and PBIAS ranged between 8% to 18%. Results also indicated a decrease in LULC corresponding to an increase in surface runoff followed by a decrease in evapotranspiration (ET). Thus, identifying appropriate strategies in terms of soil and water conservation techniques and effort in improving land management practices are recommended.

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