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Mapping of Coastal Hazards in the South-West of Côte d’Ivoire on SRTM Images

Advances in Remote Sensing 2022年第4期11卷 158-166页

作者： Jacques Tiemele Alex Agoua Brice Mobio University Center for Research and Application in Remote Sensing (CURAT) University Félix Houphou&#235 t-Boigny of Cocody Abidjan C&#244 te d’Ivoire

Finding a solution to the coastal risks that are becoming recurrent in Côte d’Ivoire, including the risk of flooding, data collection has been undertaken on the entire coast. High spatial resolution images such as the SRTM images were used to be processed in the Qgis software to evaluate with high precision the overflow hazards of the coastal courses from Tabou to Sassandra, located on the west coast of the country. To do this, the layers of the processed slopes were superimposed on those of the rivers to assess the risks of overflow in the coastal areas concerned. It appears that these areas are marked by low slopes (sandra river in Sassandra and the Djiboué lagoon in san-pédro. The foreseeable risks associated with simulations of overflow distances of 100 to 500 m of the rivers constitute threats to the port activities of san-pédro that can cause big economic losses for the country, businesses, tourism activities and lodge complexes, coastal resources, and housing. An interactive cartography interface could make it possible to better visualize the results of the processing carried out in a Websig with a view to proposing sustainable solutions for the development of the Integrated Coastal Development and Management plan of the Ivorian coastal area.

关键词： SRTM Images Flooding Overflow Hazards Sassandra san-pédro

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Algae from Fresh and Brackish Waters, Côte d’Ivoire

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Open Journal of Ecology 2023年第10期13卷 731-746页

作者： Marie paulette Adon Department of Biodiversity and Sustainable Management of Ecosystems University of Jean Lorougnon Guédé Daloa Côte d’Ivoire

The aim of this work is to study the diversity of phytoplanktonic from some fresh and brackish waters. The methodology employed consisted of sampling the organisms using the Van Dorn bottle at the surface (0.5 m) of fresh and sea waters from Container Terminal from san-pedro port Area (CTSp) during June and July 2021 and Ebrié Lagoon in June 2023. A total of 324 taxa were collected with 274 taxa for CTSp and 82 taxa for Ebrié Lagoon. The identified phyla were, in order of importance, the Bacillariophyta (151 taxa), Dinophyta (80 taxa), Euglenophyta (34 taxa), Chlorophyta (31 taxa), Chrysophyta (12 taxa), Cyanobacteria (11 taxa), Cryptophyta and Rhodophyta with 2 taxa respectively and Ochrophyta (1 taxon). In the CTSp, the species prorocentrum lima and prorocentrum micans have contributed to the highest number of the taxa during the first mission, but with low contribution during the second mission. At this mission, the contribution of the Dinophyta protoperidinium quinquecorne and the Bacillariophyta Melosira spp., Coscinodiscus nodulifer, Thalassionema frauenfeldii and Thalassionema nitzschioides was revealed. The Ebrié Lagoon was characterized by the high contribution of the species Cyclotella meneghianana during the sampling mission. As a recommendation, we propose the monitoring in time and space of toxin-producing species and the evaluation of their toxins that could constitute a risk for the fishery, recreational and commercial activities, and the ecosystems studied providing important ecosystem and economic services.

关键词： phytoplankton Diversity Abidjan san-pédro

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Webmapping of Floods in the West of the Ivorian Coast

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Journal of Geographic Information System 2022年第5期14卷 478-486页

作者： Jacques Tiemele Alex Agoua Brice Mobio Eric Djagoua Kouadio Affian University Center for Research and Application in Remote Sensing (CURAT) University Félix Houphou&euml t-Boigny of Cocody Abidjan C&ocirc te d’Ivoire

To provide answers to the problem of the management of its coastal zone, Côte d’Ivoire has initiated a pooling of data collected on the coast to feed its environmental information management system. To this end, it was a question of creating an interactive platform for decision support for the development of this coastal zone. To achieve this objective, high spatial resolution raster data from 15 to 90 m from the Shuttle Radar Topography Mission and land cover vector data from 2017 were collected for processing in Websig software (QGIS 3.4, postGreSql 10.5, postGIS), published and displayed in Geoserveur for programming HTML, CSS and JavaScript codes in Atom. The results first made it possible to visualize the main issues in the interface, in particular, the rivers, the classified forests, the degraded forests, the intact forests, the housing and the industrial plantations and then to assess the risks of floods in Sassandra and san-pédro. For overflow hazards 100 m beyond the shore, it is the houses, part of the forests and some bare soil that are submerged. As for the risks of overflowing 200 to 500 m beyond the shore, it is a large part of the housing, soils and intact forests that will be flooded. This tool must be made available to the final beneficiaries (users) by putting it online and listing it in the main search engines.

关键词： Interactive platform WebSIG Geoserveur Sassandra san-pédro Côte d’Ivoire

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