OBSERVED SHIFT AND MERGE OF HYDROLOGICAL REGIMES IN THE SOTA CATCHMENT, BENIN; AN EVIDENCE OF CLIMATE CHANGE
DOI:
https://doi.org/10.29121/granthaalayah.v6.i6.2018.1367Keywords:
Climate Change, Rainfall, Runoff, West Africa, Climate VariabilityAbstract [English]
Sub-Saharan Africa have low resilience capacities to the challenges of climate change. This study is aimed at assessing climate trends and regime shifts at the Sota Catchment, Benin. Long term rainfall and river discharge were analyzed from 1950-2010 in order to generate patterns of changes in the basin. Analysis of the hydro-meteorological were based on the two prominent vegetation zones (Sudan and Guinea Savannah) in the catchment. The rainfall and discharge data were subjected to regime shift analysis and Standardized Precipitation Indices (SPI) were computed. Downward trend of precipitation was observed in the Guinea and Sudan vegetation zones of the catchments from 1970. Rainfall and runoff amount at the two assessed vegetation zones was different in the Guinea and Sudan zone up till 1970. Clear merge of rainfall and runoff amount and patterns was witnessed between the two vegetation zones at 2007. This calls for attention of scientists and policy makers in the region to deploy necessary adaptation measures based on such clear evidence of climate change.
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Ali, A., & Lebel, T. (2009). The Sahelian standardized rainfall index revisited. International Journal of Climatology, 29(12), 1705–1714. https://doi.org/10.1002/joc
Amogu, O., Descroix, L., Yéro, K. S., Le Breton, E., Mamadou, I., Ali, A., … Belleudy, P. (2010). Increasing River Flows in the Sahel? Water, 2, 170–199. https://doi.org/10.3390/w2020170 DOI: https://doi.org/10.3390/w2020170
Badou, D. F., Diekkrüger, B., KapangaziwirI, E., Mbaye, M. L., Yira, Y., Lawin, A. E., … Afouda, A. (2018). Modelling blue and green water availability under climate change in the Beninese Basin of the Niger River Basin, West Africa. Hydrological Processes.
https://doi.org/https://doi.org/10.1002/hyp.13153 DOI: https://doi.org/10.1002/hyp.13153
Badou, D. F., Kapangaziwiri, E., Diekkrüger, B., Hounkpè, J., & Afouda, A. (2016). Evaluation of recent hydro-climatic changes in four tributaries of the Niger River Basin (West Africa). Hydrological Sciences Journal, 62(5), 1–14. https://doi.org/10.1080/02626667.2016.1250898 DOI: https://doi.org/10.1080/02626667.2016.1250898
Descroix, L., Guichard, F., Grippa, M., Lambert, L., Panthou, G., Mahé, G., … Paturel, J.-E. (2018). Evolution of Surface Hydrology in the Sahelo-Sudanian Strip: An Updated Review. Water, 10(6), 748. https://doi.org/10.3390/w10060748 DOI: https://doi.org/10.3390/w10060748
Diasso, U., & Abiodun, B. J. (2017). Future impacts of global warming and reforestation on drought patterns over West Africa. Theoretical and Applied Climatology, (November), 1–16. https://doi.org/10.1007/s00704-017-2209-3 DOI: https://doi.org/10.1007/s00704-017-2209-3
Inger, A., Ousmane, D., Martha, J.-H., & Jean-Claude, O. (2005). The Niger River Basin : A Vision for Sustainable Management. (K. G. Golitzen, Ed.). The World Bank. https://doi.org/10.1596/978-0-8213-6203-7 DOI: https://doi.org/10.1596/978-0-8213-6203-7
IPCC. (2007). Summary for Policymakers. In S. Solomon, D. Qin, M. Manning, Z. Chen, M. L. Parry, O. F. Canziani, … D. Martino (Eds.), Climate Change 2007: Mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 7–22). Cambridge University Press. https://doi.org/10.2134/jeq2008.0015br DOI: https://doi.org/10.2134/jeq2008.0015br
IPCC. (2014a). Annex II: Glossary [Mach, K.J., S. Planton and C. von Stechow (eds.)]. In: Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC, Geneva, Switzerland.
IPCC. (2014b). Summary for policymakers. In C. B. Field, V. R. Barros, D. J. Dokken, K. J. Mach, M. D. Mastrandrea, T. E. Bilir, … L. L. White (Eds.), Climate Change 2014:Impacts, Adaptation, and Vulnerability. Part A: Global and Sectoral Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 1–32). Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.
Lucio, P., Molion, L., Valadão, C., Conde, F., Ramos, A., & MLD, M. (2012). Dynamical outlines of the rainfall variability and the ITCZ role over the West Sahel. Atmospheric and Climate Sciences, 2(July), 337–350. Retrieved from DOI: https://doi.org/10.4236/acs.2012.23030
http://www.scirp.org/Journal/PaperInformation.aspx?paperID=21400
Mckee, T. B., Doesken, N. J., & Kleist, J. (1993). The relationship of drought frequency and duration to time scales. Water, 179(January), 17–22. Retrieved from
http://ccc.atmos.colostate.edu/relationshipofdroughtfrequency.pdf
Oyerinde, G. T., Hountondji, F. C. C., Wisser, D., Diekkrüger, B., Lawin, A. E., Odofin, A. J., & Afouda, A. (2015). Hydro-climatic changes in the Niger basin and consistency of local perceptions. Regional Environmental Change, 15(8), 1627–1637. https://doi.org/10.1007/s10113-014-0716-7 DOI: https://doi.org/10.1007/s10113-014-0716-7
Oyerinde, G. T., Lawin, E. A., & Odofin, A. J. (2017). Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin. Hydrology, 4(4), 52. https://doi.org/10.3390/hydrology4040052 DOI: https://doi.org/10.3390/hydrology4040052
Rodionov, S. N. (2004). A sequential algorithm for testing climate regime shifts. Geophysical Research Letters, 31(9), L09204. https://doi.org/10.1029/2004GL019448 DOI: https://doi.org/10.1029/2004GL019448
Salack, S., Klein, C., Giannini, A., Sarr, B., Worou, O. N., Belko, N., … Kunstman, H. (2016). Global warming induced hybrid rainy seasons in the Sahel. Environmental Research Letters, 11(10). https://doi.org/10.1088/1748-9326/11/10/104008 DOI: https://doi.org/10.1088/1748-9326/11/10/104008
Sylla, M. B., Giorgi, F., Pal, J. S., Gibba, P., Kebe, I., & Nikiema, M. (2015). Projected Changes in the Annual Cycle of High Intensity Precipitation Events over West Africa for the Late 21st Century. Journal of Climate, (April 2016), 150522112645005. https://doi.org/10.1175/JCLI-D-14-00854.1 DOI: https://doi.org/10.1175/JCLI-D-14-00854.1
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