Volume 7, Issue 3, June 2018, Page: 28-41
Evaluation of the Impacts of the Climate Changes on the Hydrological Network of the Kouilou-Niari Basin in the South-West of Congo Brazzaville
Christian Ngoma Mvoundou, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo
Christian Tathy, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo; Department of Exact Sciences, Higher Teacher’s Training School, MarienNgouabi University, Brazzaville, Congo
Dominique Nkounkou Tomodiatounga, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo
Raymond Gentil Elenga, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo; Department of Physic, Faculty of Sciences and Technics, MarienNgouabi University, Brazzaville, Congo
Guy Moukandi Nkaya, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo
Bernard Mabiala, Laboratory of Mechanics Energy and Engineering, Higher National Polytechnic School, MarienNgouabi University, Brazzaville, Congo
Received: Jun. 6, 2018;       Accepted: Jul. 31, 2018;       Published: Aug. 22, 2018
DOI: 10.11648/j.wros.20180703.12      View  278      Downloads  40
Abstract
The study of the rainfall-runoff relation on annual and monthly scales is based on the hydrological data measured in various stations of the Kouilou-Niari basin. The parameters of the rainfall-runoff modeling were obtained with satisfaction by today’s standards of quality. The objective of this study is to evaluate the impacts of the climate changes on the water resources of the catchment area of Kouilou-Niari using hydrological modeling. With this intention, a sample of twelvestations was selected on a hydrological cycle of more than thirty years (1952-1982). The results obtained show that the variations of the flows follow those of precipitation: reduction in N’douo zone and Niarizone and increase in Kouilou zone. These stations present a bimodal mode, with a double maximum during the rainyseasons (MAM and OND). Season (MAM) is themost rainy and season (JJAS) is the least rainy in all the stations. The relation between rainfalls and runoffs is satisfactory, because the hydrological mode models itselfonprecipitation one. The flows of the basin are rising, with anaveragestreamflow of 445 m3/sincluded between a minimum of 86.2 m3/s and a maximum of 930.4 m3/s for respective specific modules of 16.91 and 23.73 l.s-1/km2. The return periods of the floods are estimated of 5, 10 and 50 years for respective streamflows of 2470, 2620 and 2682 m3/s. This particular behavior of the basin finds its reasons not only in the pluviometric mode but also in the physical characteristics (relief, geologyand pedology). The Kecoefficient of flow is 42.9% and the seasonal variation K3 is 13.3 atSounda station.
Keywords
Kouilou-Niari Basin, Climate Change, Hydrological Network, Hydrological Data
To cite this article
Christian Ngoma Mvoundou, Christian Tathy, Dominique Nkounkou Tomodiatounga, Raymond Gentil Elenga, Guy Moukandi Nkaya, Bernard Mabiala, Evaluation of the Impacts of the Climate Changes on the Hydrological Network of the Kouilou-Niari Basin in the South-West of Congo Brazzaville, Journal of Water Resources and Ocean Science. Vol. 7, No. 3, 2018, pp. 28-41. doi: 10.11648/j.wros.20180703.12
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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