Volume 40, Issue 1, July 2023, Pages 291–302
N’Guessan Kouamé Emmanuel Abo1 and Gneneyougo Emile SORO2
1 Laboratoire Géosciences et Environnement, Université Nangui Abrogoua, Abidjan, Côte d’Ivoire
2 UFR des Sciences et Gestion de l'Environnement, Université NANGUI ABROGOUA, Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2023 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.
The objective of this study is to analyses long-term trends and rainfall breaks in the Bandama River catchment. To achieve this objective, the study used data from nineteen (19) rainfall stations from 1950 - 2020. The methodology adopted was based on the Mann Kendall (classical and modified), Krusal Wallis and Cumulative Deviation statistical tests to detect and analyses significant changes in the rainfall series. The results show that 58% of the stations show a significant downward trend at the 5% risk without taking into account the Hurst effect, while with the Hurst effect only 32% of the stations show significant downward trends at the 5% risk. The breaks detected in this study oscillate around 1970 with a deficit ranging from -6% to 23 %. Furthermore, the Moran Index (MI) revealed a spatial dependence in the rainfall series of the catchment.
Author Keywords: West Africa, Bandama, Climate change, Hurst phenomenon, Statistical test.
N’Guessan Kouamé Emmanuel Abo1 and Gneneyougo Emile SORO2
1 Laboratoire Géosciences et Environnement, Université Nangui Abrogoua, Abidjan, Côte d’Ivoire
2 UFR des Sciences et Gestion de l'Environnement, Université NANGUI ABROGOUA, Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2023 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
The objective of this study is to analyses long-term trends and rainfall breaks in the Bandama River catchment. To achieve this objective, the study used data from nineteen (19) rainfall stations from 1950 - 2020. The methodology adopted was based on the Mann Kendall (classical and modified), Krusal Wallis and Cumulative Deviation statistical tests to detect and analyses significant changes in the rainfall series. The results show that 58% of the stations show a significant downward trend at the 5% risk without taking into account the Hurst effect, while with the Hurst effect only 32% of the stations show significant downward trends at the 5% risk. The breaks detected in this study oscillate around 1970 with a deficit ranging from -6% to 23 %. Furthermore, the Moran Index (MI) revealed a spatial dependence in the rainfall series of the catchment.
Author Keywords: West Africa, Bandama, Climate change, Hurst phenomenon, Statistical test.
How to Cite this Article
N’Guessan Kouamé Emmanuel Abo and Gneneyougo Emile SORO, “Analysis of long-term rainfall trends and change point in Bandama Basin, Côte d’Ivoire,” International Journal of Innovation and Applied Studies, vol. 40, no. 1, pp. 291–302, July 2023.
