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Calibration and Validation of the GR2M Hydrologic Model in the Kouilou-Niari Basin in Southwestern Congo-Brazzaville

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Open Journal of Modern Hydrology 2022年第3期12卷 109-124页

作者： Christian Ngoma Mvoundou Christian Tathy Harmel Obami-Ondon Guy Blanchard Matété Moukoko richard romain niere Laboratory of Mechanics Energy and Engineering Higher National Polytechnic School Marien Ngouabi University Brazzaville Congo Laboratory of Mechanics Energy and Engineering Higher National Polytechnic School Marien Ngouabi University Brazza-ville Congo Department of Exact Sciences Higher Teacher’s Training School Marien Ngouabi University Brazzaville Congo

The hydrologic simulation of a catchment area, described as the transformation of rainfall into runoff, generally uses hydrologic model. This work opts for the global conceptual hydrologic model GR2M, a monthly time step model, to study the Kouilou-Niari basin, the second most important ones of the Republic of Congo. This includes two parameters to model the hydrologic behavior of a catchment area. The choice of the conceptual model GR2M is justified by the reduced number of parameters and the monthly time scale. The objective of this study is to determine the characteristic parameters of the GR2M model, by a calibrating and a validating procedure. The use of these parameters enables to follow the evolution of the water resources from the climatic variables. It has been first carried out a characterization of some physical, geological and climatic factors governing the flow, by dealing with the main climatic variables which constitute the inputs of the hydrologic model. Then, a hydrologic rainfall-runoff modeling allows to calibrate and validate the model at monthly time scale. Taking into account the number of parameters involved in hydrologic processes and the complexity of the cathment area, this model gives acceptable results throughout the Kouilou-Niari basin. The values of the Nash-Sutcliffe criterion and those of the correlation coefficient obtained are greater than 80% in validation, which explains the performance and robustness of the GR2M model on this basin.

关键词： Kouilou-Niari Catchment Area Rainfall-Runoff Modeling GR2M Model Nash-Sutcliffe Criterion Calibration Phase Validation Phase

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Hydrogeological Characterization and Approach to a Conceptual Model of the Aquifer of the Cuvette Basin, Republic of Congo

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International Journal of Geosciences 2022年第11期13卷 997-1023页

作者： Noida Janesia Lebela Mouakoumbat Urbain Mbilou Gampio Guy Moukandi Nkaya Chesther Gatsé Ebotehouna Armel Obami Ondon romain richard niere National Polythecnic School Marien Ngouabi University Brazzaville Congo Department of Geology Faculties of Science and Technology Marien Ngouabi University Brazzaville Congo

The continuous aquifers of the Congolese Cuvette basin constitute the seat of significant water tables reversibly supplying the Congo River basin as well as the water tables they drain. Consisting mainly of sandy-clayey-sandstone formations, these aquifers contain groundwater which is the main source of drinking water supply for communities in this sector of the departments Cuvette and Cuvette-Ouest. The need for water being more and more acute, these aquifers have been subjected to drilling operations in order to supply drinking water to these populations. The information obtained from these operations is data which made it possible to obtain information relating to the lithology, the hydrogeological parameters of these aquifers and information on the depth and on the lateral variations of the water table. The purpose of this present work is to contribute to the hydrogeological characterization of the aquifer of the Cuvette basin in the departments of Cuvette and Cuvette-Ouest via data from the analysis of the technical sheets of drillings carried out by the ASPERBRAS Company, collected at the Ministry of Major Works and territory planning. This characterization was made using Visual MODFLOW Flex 2015.1 software coupled with Surfer 10 software and Rock Works 17 software. The hydrogeological interpretation of the data shows that this aquifer, whose constitution is essentially made up of sands, clayey sands and clay, is continuous, porous and free. This composition gives the aquifer of Cuvette basin a heterogeneous character. In addition, a piezometric map was produced in order to indicate the direction of the water flows which turned out to be from west to east towards the lowest areas occupied by the valleys of the rivers and rivers. The conceptual model shows that the depth of the aquifer deceases considerably from the Cuvette-Ouest towards the Cuvette.

关键词： Cuvette Basin Hydrogeology Aquifer Piezometric Map Conceptual Model

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