[ Caractérisation de la vulnérabilité à la pollution d’un écosystème aquatique: La rivière Sô et son bassin versant (Sud Benin, Afrique de l’Ouest) ]
Volume 24, Issue 1, August 2018, Pages 181–195
Tohozin Florence1, F. Avahounlin Ringo2, and Expédit W. VISSIN3
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, FAST, UAC), Benin
3 Laboratoire Pierre Pagney: Climat, Eau, Ecosystèmes et Développement (LACEEDE/UAC), Abomey-Calavi, 03 BP 1122 Cotonou, Benin
Original language: French
Copyright © 2018 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.
Population growth is now causing increasing pressure on the environment. In view of the consequences that flow from it, the safeguarding and protection of ecosystems is a fundamental necessity for the biodiversity of fish species. At the scale of the Sô watershed and its tributary stream, anthropogenic actions have considerably influenced the quality of the available water resources. The purpose of this study is to assess the state of vulnerability of the water resource. From the physicochemical and bacteriological data of the water taken from three points of the outlet of the basin, various forms of water pollution have been proved. The results showed a strong variation of physicochemical parameters, a seasonal dynamics of pollution and differentiated mineralization processes. With high photosynthetic activity in the river, a high concentration of dissolved oxygen, COD, nitrates, nitrites, ammonium and other ions is observed in the dry season. The observed presence of coliforms and streptococci confirmed the state of organic pollution and bacteriological and toxicological risks at the basin scale. This situation now calls on the authorities at various levels and managers of the basins to take the necessary measures to avoid public health problems to the neighboring populations, this situation has an impact on the current development of the locality.
Author Keywords: Sô river, aquatic ecosystems, vulnerability to pollution, physicochemical and bacteriological parameters.
Volume 24, Issue 1, August 2018, Pages 181–195
Tohozin Florence1, F. Avahounlin Ringo2, and Expédit W. VISSIN3
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, FAST, UAC), Benin
3 Laboratoire Pierre Pagney: Climat, Eau, Ecosystèmes et Développement (LACEEDE/UAC), Abomey-Calavi, 03 BP 1122 Cotonou, Benin
Original language: French
Copyright © 2018 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
Population growth is now causing increasing pressure on the environment. In view of the consequences that flow from it, the safeguarding and protection of ecosystems is a fundamental necessity for the biodiversity of fish species. At the scale of the Sô watershed and its tributary stream, anthropogenic actions have considerably influenced the quality of the available water resources. The purpose of this study is to assess the state of vulnerability of the water resource. From the physicochemical and bacteriological data of the water taken from three points of the outlet of the basin, various forms of water pollution have been proved. The results showed a strong variation of physicochemical parameters, a seasonal dynamics of pollution and differentiated mineralization processes. With high photosynthetic activity in the river, a high concentration of dissolved oxygen, COD, nitrates, nitrites, ammonium and other ions is observed in the dry season. The observed presence of coliforms and streptococci confirmed the state of organic pollution and bacteriological and toxicological risks at the basin scale. This situation now calls on the authorities at various levels and managers of the basins to take the necessary measures to avoid public health problems to the neighboring populations, this situation has an impact on the current development of the locality.
Author Keywords: Sô river, aquatic ecosystems, vulnerability to pollution, physicochemical and bacteriological parameters.
Abstract: (french)
La croissance démographique entraine de nos jours une pression de plus en plus remarquable sur l’environnement. Au regard des conséquences qui y découlent, la sauvegarde et la protection des écosystèmes sont d’une nécessité fondamentale pour la biodiversité des espèces halieutiques. A l’échelle du bassin versant de la rivière Sô et de son cours d’eau tributaire, les actions anthropiques ont considérablement influencé la qualité de la ressource en eau disponible. Cette étude a pour l’objectif l’évaluation de l’état de vulnérabilité à la pollution de la ressource en eau. A partir des données physico-chimiques et bactériologiques des eaux prélevées à trois points de l’exutoire du bassin, il a été prouvé diverses formes de pollution des eaux. Les résultats ont montré une forte variation des paramètres physico-chimiques, une dynamique saisonnière de la pollution et des processus de minéralisations différenciés. Avec une grande activité photosynthétique dans la rivière, on note en saison sèche une forte concentration de l’Oxygène dissous, de la DCO, des nitrates, des nitrites, de l’ammonium et autres ions. La présence remarquée des coliformes et streptocoques a confirmé l’état de pollution organique et bactériologiques et les risques de toxicologie à l’échelle du bassin. Cette situation interpellent désormais les autorités à divers niveaux et gestionnaires des bassins à prendre les dispositions nécessaires afin d’éviter des problèmes de santé publique aux populations riveraines, cette situation a sans doute un impact sur le développement actuelle de la localité.
Author Keywords: rivière Sô, écosystèmes aquatiques, vulnérabilité à la pollution, paramètre physico-chimiques et bactériologiques.
How to Cite this Article
Tohozin Florence, F. Avahounlin Ringo, and Expédit W. VISSIN, “Characterization of the vulnerability to pollution of an aquatic ecosystem: The Sô river and its watershed (South Benin, West Africa),” International Journal of Innovation and Applied Studies, vol. 24, no. 1, pp. 181–195, August 2018.
