[ Evaluation des écoulements de base dans le bassin de l’Ouémé (Bénin) par séparation des hydrogrammes ]
F. Avahounlin Ringo1, Okoundé Jean-Eudes2, Koudérin Lucie3, and Danhossou Gilbert4
1 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
2 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
3 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
4 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
Original language: French
Copyright © 2025 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This study aims to apply different methods for oueme-basin base flow assessment. Of the four separation hydrogam approaches of that exist for the assessment of the baseflow, only the approaches by filter proposed by Nathan & McMahon, Chapman and the one this of Furey and Gupta have been tested in view of an identification of the most suitable method for the evaluation of the baseflow. The application of the method «approaches by filter», watch that the filter of Nathan & McMahon gives some results very little satisfactory in spite of relatively weak values of mistakes. As for the filters proposed by Furey & Gupta, the gotten results present an overestimate of the baseflow during the period of the low flow. Only the filter proposed by Chapman shows a good evaluation of the baseflow all along the year. The method of Chapman is very comfortable and precise. It is evident from these works that the method of Chapman can be used to value the oueme baseflow. The results descended of its application can be used therefore like.
Author Keywords: approach by filter, low flow, assessment, oueme-basin, hydrogram separation.
F. Avahounlin Ringo1, Okoundé Jean-Eudes2, Koudérin Lucie3, and Danhossou Gilbert4
1 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
2 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
3 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
4 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, UAC), Benin
Original language: French
Copyright © 2025 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This study aims to apply different methods for oueme-basin base flow assessment. Of the four separation hydrogam approaches of that exist for the assessment of the baseflow, only the approaches by filter proposed by Nathan & McMahon, Chapman and the one this of Furey and Gupta have been tested in view of an identification of the most suitable method for the evaluation of the baseflow. The application of the method «approaches by filter», watch that the filter of Nathan & McMahon gives some results very little satisfactory in spite of relatively weak values of mistakes. As for the filters proposed by Furey & Gupta, the gotten results present an overestimate of the baseflow during the period of the low flow. Only the filter proposed by Chapman shows a good evaluation of the baseflow all along the year. The method of Chapman is very comfortable and precise. It is evident from these works that the method of Chapman can be used to value the oueme baseflow. The results descended of its application can be used therefore like.
Author Keywords: approach by filter, low flow, assessment, oueme-basin, hydrogram separation.
Abstract: (french)
La présente étude a pour objectif l’application des méthodes d’évaluation des écoulements de base pour l’estimation des débits de base dans le bassin Ouémé. Des quatre approches de séparation d’hydrogramme existantes pour l’évaluation des écoulements de base, seules les approches par filtre proposée par Nathan & McMahon, Chapman et celle ce de Furey et Gupta ont été testées en vue d’une identification de la méthode la plus appropriée pour l’estimation des débits de base. L’application de la méthode « approche par filtre«, montre que le filtre de Nathan & McMahon donnent des résultats très peu satisfaisants malgré des valeurs relativement faibles d’erreurs. Quant aux filtres proposés par Furey & Gupta, les résultats obtenus présentent une surestimation des écoulements de base durant la période des basses eaux. Seul le filtre proposé par Chapman montre une bonne estimation de l’écoulement de base tout au long de l’année. La méthode de Chapman est très aisée et précise. IL ressort de ces travaux que la méthode de Chapman peut être utilisée pour évaluer les débits de base de l’Ouémé. Les résultats issus de son application peuvent donc être utilisés comme variable hydrologique pour des études futures entrant dans le cadre de gestion des ressources en eau durant la période des basses eaux.
Author Keywords: approche par filtre, débit de base, évaluation, bassin de l’ouémé, séparation d’hydrogramme.
