An interdisciplinary scenario analysis to assess the water availability and water consumption in the Upper Ouémé catchment in Benin

Abstract. This paper presents an interdisciplinary scenario analysis to assess the influence of global and regional change on future water availability and water consumption in the Upper Oueme catchment in central Benin. For the region three development scenarios were evolved. These scenarios are combined with climate change scenarios based on the IPCC (Intergovernmental Panel on Climate Change). In the modelling approach the quantification of the land use/land cover change is performed by the cellular automata model CLUE-S. The future climate scenarios are computed with the regional climate model REMO driven by the global ECHAM model. Using this data different land use and climate change scenarios can be calculated with the conceptual hydrological model UHP-HRU to assess the effects of global changes on the future water availability in Benin. To analyse the future water availability also the water consumption has to be taken into account. Due to high population growth an increase in water need in the future is expected for the region. To calculate the future household water consumption data from a regional survey and demographic projections are used. Development of the water need for animal husbandry is also considered. The first test run of the modelling approach was performed for the development scenario 'business as usual' combined with the IPCC scenario B2 for the year 2025. This test demonstrates the applicability of the approach for an interdisciplinary scenario analysis. A continuous run from 2000–2025 will be simulated for different scenarios as soon as the input data concerning land use/land cover and climate are available.

[1]  E. Baltas,et al.  Regional impacts of climate change on water resources quantity and quality indicators , 2000 .

[2]  A. Becker,et al.  Assessment of land use and climate change impacts on the mesoscale , 2001 .

[3]  Universitäts und Landesbibliothek Bonn.  Influence des systèmes agraires sur l'utilisation des terroirs, la séquestration du carbone et la sécurité alimentaire dans le bassin versant de l'Ouémé supérieur au Bénin , 2006 .

[4]  Martinus S. Krol,et al.  Global change and regional impacts. Water availability and vulnerability of ecosystems and society in the semiarid neotheast of brazil , 2003 .

[5]  M. Schopp,et al.  Water consumption embedded in its social context, north-western Benin , 2005 .

[6]  H. Paeth.  KEY FACTORS IN AFRICAN CLIMATE CHANGE EV A LUATED BY A REGIONAL CLIMATE MODEL , 2004 .

[7]  F. Gasse,et al.  Hydrological response of a catchment to climate and land use changes in Tropical Africa: case study South Central Ethiopia , 2003 .

[8]  M. Doevenspeck.  Migration im ländlichen Benin : sozialgeographische Untersuchungen an einer afrikanischen Frontier , 2005 .

[9]  P. Fauré,et al.  Carte pédologique de reconnaissance de la République Populaire du Bénin à 1/200.000 : feuilles de Natitingou (6), Porga (8) , 1977 .

[10]  Oyediran Ojo,et al.  Implications of climatic variability and climate change on water resources availability and water resources management in West Africa , 2003 .

[11]  D. Jacob,et al.  Regional dynamical downscaling over West Africa: model evaluation and comparison of wet and dry years , 2005 .

[12]  C. Priestley,et al.  On the Assessment of Surface Heat Flux and Evaporation Using Large-Scale Parameters , 1972 .

[13]  S. Lele.  Land Use, Nature Conservation and the Stability of Rainforest Margins in Southeast Asia , 2006 .

[14]  Bernd Diekkrüger,et al.  A conceptual, regional hydrological model for Benin (West Africa): validation, uncertainty assessment and assessment of applicability for environmental change analyses , 2004 .

[15]  Peter H. Verburg,et al.  Accessibility and land-use patterns at the forest fringe in the northeastern part of the Philippines , 2004 .

[16]  R. Gil Pontius,et al.  Land-cover change model validation by an ROC method for the Ipswich watershed, Massachusetts, USA , 2001 .

[17]  PETER H. VERBURG,et al.  Modeling the Spatial Dynamics of Regional Land Use: The CLUE-S Model , 2002, Environmental management.

[18]  B. Volkoff,et al.  Carte pédologique de reconnaissance de la République Populaire du Bénin à 1/200 000 : feuille de Porto-Novo , 1976 .

[19]  William J. Cosgrove,et al.  World Water Vision: Making Water Everybody's Business , 2000 .