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Flood Risk Assessment in the Lower Valley of Ouémé, Benin

Open Journal of Modern Hydrology 2024年第2期14卷 130-151页

作者： Yaovi Aymar Bossa Octave Djangni Yacouba Yira Jean Hounkpè Angèle D. Avossè luc ollivier sintondji National Institute of Water University of Abomey-Calavi Abomey Calavi Benin Africa Centre of Excellence for Water and Sanitation University of Abomey-Calavi Abomey Calavi Benin Hydro-Climate Services Ouagadougou Burkina Faso Applied Science and Technology Research Institute-IRSAT/CNRST Ouagadougou Burkina Faso

In response to the increased frequency of flood events in recent years, it has become crucial to enhance preparedness and anticipation through precise flood risk assessments. To this end, this study aims to produce updated and precise flood risk maps for the Lower Valley of Ouémé River Basin, located in the South of Benin. The methodology used consisted of a combination of geographical information systems (GIS) and multi-criteria analysis, including Analytical Hierarchy Process (AHP) methods to define and quantify criteria for flood risk assessment. Seven hydro-geomorphological indicators (elevation, rainfall, slope, distance from rivers, flow accumulation, soil type, and drainage density), four socio-economic vulnerability indicators (female population density, literacy rate, poverty index, and road network density), and two exposure indicators (population density and land use) were integrated to generate risk maps. The results indicate that approximately 21.5% of the Lower Valley is under high and very high flood risk, mainly in the south between Dangbo, So-Ava, and Aguégués. The study findings align with the historical flood pattern in the region, which confirms the suitability of the used method. The novelty of this work lies in its comprehensive approach, the incorporation of AHP for weighting factors, and the use of remote sensing data, GIS technology, and spatial analysis techniques which adds precision to the mapping process. This work advances the scientific understanding of flood risk assessment and offers practical insights and solutions for flood-prone regions. The detailed flood risk indicator maps obtained stand out from previous studies and provide valuable information for effective flood risk management and mitigation efforts in the Lower Valley of Ouémé.

关键词： Flood Hazard Exposure Vulnerability Risk Lower Valley of Ouémé

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Flood Risk Assessment in the Lower Valley of Ouémé, Benin

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Open Journal of Modern Hydrology（现代水文学期刊） 2024年第2期 130页

作者： Yaovi Aymar Bossa Octave Djangni Yacouba Yira Jean Hounkpè Angèle D.Avossè luc ollivier sintondji

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Influence of the Geomorphology of the Okpara Watershed on Lowland Water Resources (Benin)

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Journal of Geoscience and Environment Protection 2022年第12期10卷 299-312页

作者： Idrissou Sinabarigui O. luc sintondji Mathieu Hounsou Jean-Pierre Vandervaere Laboratory of Hydraulics and Water Management (LHME) National Water Institute University of Abomey-Calavi Abomey-Calavi Benin Institute of Environmental Geosciences PHYREV Team Grenoble Alpes University PhITEM (Physics Engineering Earth Environment Mechanics) Grenoble France

Inland valleys are agro-ecosystems whose study is necessary not only for agricultural and agro-pastoral perspectives but also for the management of natural crises such as floods and droughts. This cannot be done by ignoring the catchment area which circumscribes them. The present study aims at evaluating the geomorphological parameters of the basin and their influence on the hydrological functioning of the Okpara catchment in general and the lowlands in particular for a good management of the said basin. To do so, an SRTM image was exploited thanks to GIS and Remote Sensing tools to analyze the morphometric properties of this watershed with ArcGIS 10.3 software. Through the results of this study, it can be seen that the Okpara watershed is very elongated, the relief is not very uneven with a dense hydrographic network characterized by low peak flood flows. The watershed is characterized by a permeable geological formation that favours a good infiltration of surface water and limits runoff. Thus, for a good management of the catchment area from these lowlands at the head of the hydrographic network, it is important to undertake actions to improve the storage capacity and to restore the flow channels.

关键词： GIS DEM Hydrology Morphometry Watershed Okpara

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Evaluation of the Microbiological Quality of Drinking Water and Health Risks in the Commune of Sô-Ava, in Southern Benin (Evaluation De La QualitéMicrobiologique Des Eaux De Boisson Et Risques Sanitaires Dans La Commune De Sô-Ava, Au Sud-Bénin)

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Journal of Water Resource and Protection 2022年第7期14卷 501-514页

作者： Oswald F. Dan D. Mathieu Maurice Ahouansou luc O. sintondji Laboratory of Hydraulics and Water Control National Institute of Water University of Abomey-Calavi (LHME/INE/UAC) Cotonou Benin

Access to drinking water in rural and semi-rural areas is a major concern for the populations because of the quality of the resources. This research work aims to analyze the bacteriological quality of the water consumed by households in the Commune of Sô-Ava in order to establish a relationship between this quality and the health problems observed within the communities. To succeed in this study, documentary research, surveys and observations in the field and analyzes of eighty-two (82) water samples were analyzed in the laboratory during two (2) seasons (rainy and dry). From the results obtained, it appears that the samples present concentrations of total germs, faecal coliforms, Escherichia coli, faecal enterococci, sulphite-reducing anaerobic bacteria (ASR), salmonella and Shiguela which do not comply with the water potability standards in respectively 78.05%, 60.98%, 50%, 64.63%, 80.49% and 70.73% of the samples taken. The statistics on the diseases recorded during this decade in the Commune showed that the populations of Sô-Ava are confronted with several ailments such as: malaria (75%), Acute Respiratory Infections IRA, (16%) and Gastrointestinal disorders (5%) especially during floods and during the rainy season. Education and sensitization of the population on good public hygiene practices around water must be highlighted in order to avoid waterborne diseases.

关键词： Microbial Pollution Drinking Water Health Risks Sô-Ava Benin

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Study of the Physico-Chemical and Bacteriological Characteristics of Drinking Water in So-Ava,South Benin

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Journal of Water Resource and Protection 2018年第11期10卷 1031-1046页

作者： Oswald F.Dan Edouard Aho D.Mathieu Maurice Ahouansou luc O.sintondji Laetitia Assoti Josue Zandagba Dodji Amouzouvi Laboratory of Hydraulics and Water Control National Institute of WaterUniversity of Abomey-Calavi(LHME/INE/UAC)Abomey-CalaviBenin Laboratory of Analysis and Research ReligionsSpace and Development(LARRED/FLAC/UAC)Abomey-CalaviBenin National Polytechnic Institute-Felix Houphouet Boigny(INP-HB) YamoussoukroCote d’Ivoire Laboratory of Applied Hydrology National Institute of WaterUniversity of Abomey-Calavi(LHA/INE/UAC)Abomey-CalaviBenin

The present study assesses the physicochemical and bacteriological quality of the drinking water used by the population of S?-Ava based on the Beninese standards and those established by the World Health Organization (WHO). In rural and peri-urban areas of Benin where public water supply systems are inadequate or almost non-existent, the population consumes water of various sources of unknown qualities. A total of 67 water samples were analyzed during the rainy season (July 2017) and in the dry season (January 2018) for certain physical, chemical and bacteriological parameters using the standard methods. The results of the analyses reveal that the physicochemical characteristics of the water used for consumption in S?-Ava comply with the drinking water standards of the World Health Organization and those in force in Benin except for the percentages of the following parameters: pH (41.80%);turbidity (25.37%);the color (16.42);ammonium (17.91%);iron (40.30%);Nitrites (4.48%);Residual chlorine (91.05). Bacteriologically, the analyses showed a high total aerobic mesophilic flora contamination, faecal coliforms, E. coli, faecal enterococci respectively in 89.55%, 82.09%, 50.75% and 70.15% of the analyzed water samples. The ratio of faecal coliforms to faecal enterococci indicated that the origin of faecal contamination was human in 59.7% of the samples and animal in 40.3% of the samples. The adoption of hygiene measures at the water point, during the transport and storage of water, including the treatment by chlorination of drinking water at the family level was recommended for the population concerned and household awareness on the adoption of basic hygiene and sanitation measures have been recommended for hygiene and sanitation services.

关键词： Drinking Water Quality Bacteriology Pollution S?-Ava Benin

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