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Climate 2015, 3(3), 442-458; doi:10.3390/cli3030442

Hydrological Impacts of the Changes in Simulated Rainfall Fields on Nakanbe Basin in Burkina Faso

1
Institut International d'Ingénierie de l'Eau et de l'Environnement de Ouagadougou (2iE), 01 BP 594 Ouagadougou, Burkina Faso
2
Laboratoire de Météorologie Dynamique du CNRS/IPSL, Université P. & M. Curie (Paris 6), Tour 45, 3ème étage, Case 99, 4 pl. Jussieu, 75252 Paris cedex 05, 4 Place Jussieu, 75005 Paris, France
Current Address: West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), 06 BP 9507 Ouagadougou, Burkina Faso.
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 3 February 2015 / Revised: 8 June 2015 / Accepted: 18 June 2015 / Published: 25 June 2015
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Abstract

Changes in rainfall regime during the last five decades over the West African Sahel have significantly modified the hydrological regime of many rivers with a significant impact on water resources. In this study, the main hydrological processes on the Nakanbe watershed in Burkina Faso are described with two hydrological models: GR2M (lumped and monthly model) and ORCHIDEE (ORganising Carbon and Hydrology In Dynamic EcosystEms) (distributed and half hourly model). Both models were calibrated on the watershed from observed runoff data at Wayen outlet (area of 22,000 km2) for the 1978–1999 period. The mean annual hydrological balance components on the watershed over this period are composed of about 4% of runoff, 10% of groundwater recharge and 86% of actual evapotranspiration for both models. An assessment of the hydrological impacts of the changes in rainfall regime simulated by five regional climate models shows some discrepancies. The hydrological simulations show that the hydrological impacts on the water balance of the watershed come mainly from the changes in rainfall field with regard to the frequency and the intensity of rain events. Compared to the decrease in frequency, it appears that the decrease in the intensity of rain events is much more prejudicial to runoff and groundwater recharge. View Full-Text
Keywords: climate change; regional climate model; hydrological modeling; Nakanbe basin; Burkina Faso; Sahel climate change; regional climate model; hydrological modeling; Nakanbe basin; Burkina Faso; Sahel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ibrahim, B.; Karambiri, H.; Polcher, J. Hydrological Impacts of the Changes in Simulated Rainfall Fields on Nakanbe Basin in Burkina Faso. Climate 2015, 3, 442-458.

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