Infos climat FLASH INFO du Portail du CILSS dans le domaine du Changement Climatique et de la Gestion Durable des Terres en Afrique de l'Ouest

Catchment classification: multivariate statistical analyses for physiographic similarity in the Upper Niger Basin

Chaibou Begou, J.;  Bazie, P.; Afouda, A.

JamilatouChaibouBegouInt. Journal of Engineering Research and Applications. www.ijera.com ISSN: 2248-9622, Vol. 5, Issue 9, (Part-1) September 2015, pp.60-68
The objective of this study was to determine physiographic similarity, as indicator of hydrologic similarity between catchments located in the Upper Niger Basin, and to derive the dominant factors controlling each group singularity. Results showed a clear distribution into 2 major clusters: a group of easterly flat catchments and another of westerly hilly catchments. This nomenclature came from the interpretation of the main factors, topography and longitude, that seem to control the most important variability between both clusters. In addition, the hilly catchments were designated to be dominated by forest and ACRISOL soil type, two additional drivers of similarity. Read the full article HERE

 

Multi-Site Validation of the SWAT Model on the Bani Catchment: Model Performance and Predictive Uncertainty (2)

Chaibou Begou, J.; Jomaa, S.; Benabdallah, S.; Bazie, P.; Afouda, A.; Rode.

Water 2016, 8(8), 338; doi:10.3390/w8080338. Received: 22 June 2016 / Revised: 2 August 2016 / Accepted: 2 August 2016 / Published: 9 August 2016

The objective of this study was to assess the performance and predictive uncertainty of the Soil and Water Assessment Tool (SWAT) model on the Bani River Basin, at catchment and subcatchment levels. The Results indicated a good performance of the global model at daily as well as monthly time steps with adequate predictive uncertainty. Read the full article HERE

Early warning systems for food security in West Africa: evolution, achievements and challenges

L. Genesio1, M. Bacci, C. Baron, B. Diarra, A. Di Vecchia, A. Alhassane, I. Hassane, M. Ndiaye, N. Philippon, V. Tarchiani, S. Traoré ; Atmospheric Science Letters Volume 12, Issue 1, pages 142–148, January/March 2011. Consulter l'article inétgral ICI.

In West Africa, early warning systems (EWSs) for food security have been widely recognized to have contributed, in the last 20 years, to an improved ability to deal with famine emergencies.

Read more: Early warning systems for food security in West Africa: evolution, achievements and challenges

Adapting to climate variability and change in smallholder farming communities: A case study form Burkina Faso, Chad and Niger

Climate variability and change is regarded as having major impacts on key sustainable socio-economic and environmental indicators in Sub-Saharan West Africa. Because of these concerns, this article investigated smallholders knowledge, skills, and aspirations about managing climate change, and document adaptations strategies used in the semi-arid regions coming from Burkina Faso, Chad and Niger. In this article, climate data from 1950 to the present, including daily and aggregated rainfall and temperature variability, trends and extremes are analyzed. Farmer perceptions of climate, particularly with what was expected and what was actually observed are also examined. Field data was collected through: (i) a semi-structured survey administered to 478 head households; (ii) from focus groups through discussion and consultation with local stakeholders by using a risk matrix.

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A unifying view of climate change in the Sahel linking intra-seasonal, interannual and longer time scales

A Giannini, S Salack, T Lodoun, A Ali, A T Gaye and O Ndiaye ; Environmental Research Letters Volume 8 Number , 2013, 8 024010 doi:10.1088/1748-9326/8/2/024010. Consulter l'article intégral ICI.

We propose a re-interpretation of the oceanic influence on the climate of the African Sahel that is consistent across observations, 20th century simulations and 21st century projections, and that resolves the uncertainty in projections of precipitation change in this region: continued warming of the global tropical oceans increases the threshold for convection, potentially drying tropical land, but this 'upped ante' can be met if sufficient moisture is supplied in monsoon flow.

Read more: A unifying view of climate change in the Sahel linking intra-seasonal, interannual and longer...

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