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Like the countries of West Africa, Côte d'Ivoire is faced with the problems of coastal erosion. Coastal erosion occurs along the entire Ivorian coastline and is characterized by the destruction of material goods (infrastructure, habitats and tourist sites). For about forty years, this phenomenon of natural or anthropic origin has accelerated and become a serious problem in Côte d'Ivoire. In order to anticipate the probable modifications of the coast and to contribute to the planning of the most adequate type of development of the Assinie coastline, the present study was conducted. Its objective is to contribute to the knowledge of the coastline of the sandy coastline of the sub-prefecture of Assinie, by mapping the dynamics of the coastline from Assouindé to Assinie-France and to statistically evaluate this evolution. To achieve this, the methodological approach consisted of compilation of data from high-resolution satellite images of Sentinel 2A of the study area for the years 2015, 2017, 2019 and 2021 available on Copernicus. These satellite images have been thresholded to improve the visual quality of the contours of the two entities, land-water, facilitating the digitization of coastlines. The reference line being the shoreline, the software MobiTC (Mobility of the Coastline) was used to quantify the historical evolution of the coastline by the automatic generation of a baseline and statistical calculations performed trace by trace perpendicular to this baseline. This method improves the calculations and allows for determining the evolution in one phase. The erosion or progradation rates (EPR) by the extreme points method and the erosion or progradation rates (OLS) by the least squares method were obtained trace by trace. Thus, the study enabled the development of an updated map of the eroded and enlarged sectors by providing an assessment of the evolution of the TDC across the 4019 traces generated over a 10-m cutoff distance. Between 2015 and 2021, the observed variations indicate that the coastline is eroding with an average rate of −1.15 m/year and a progradation rate of 3.07 m/year on average.

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Application of the MobiTC Tool to High-Resolution Data for the Study of Coastline Dynamics on the Sandy Coast of Assinie (Côte D’Ivoire)

  • 会议论文

  • 发表日期：

    2026年

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  • Hervé Brice Abaka Mobio,
  • Brigitte Tewa Aney,
  • Jean-Baptise Ahon Kassi

摘要

Like the countries of West Africa, Côte d'Ivoire is faced with the problems of coastal erosion. Coastal erosion occurs along the entire Ivorian coastline and is characterized by the destruction of material goods (infrastructure, habitats and tourist sites). For about forty years, this phenomenon of natural or anthropic origin has accelerated and become a serious problem in Côte d'Ivoire. In order to anticipate the probable modifications of the coast and to contribute to the planning of the most adequate type of development of the Assinie coastline, the present study was conducted. Its objective is to contribute to the knowledge of the coastline of the sandy coastline of the sub-prefecture of Assinie, by mapping the dynamics of the coastline from Assouindé to Assinie-France and to statistically evaluate this evolution. To achieve this, the methodological approach consisted of compilation of data from high-resolution satellite images of Sentinel 2A of the study area for the years 2015, 2017, 2019 and 2021 available on Copernicus. These satellite images have been thresholded to improve the visual quality of the contours of the two entities, land-water, facilitating the digitization of coastlines. The reference line being the shoreline, the software MobiTC (Mobility of the Coastline) was used to quantify the historical evolution of the coastline by the automatic generation of a baseline and statistical calculations performed trace by trace perpendicular to this baseline. This method improves the calculations and allows for determining the evolution in one phase. The erosion or progradation rates (EPR) by the extreme points method and the erosion or progradation rates (OLS) by the least squares method were obtained trace by trace. Thus, the study enabled the development of an updated map of the eroded and enlarged sectors by providing an assessment of the evolution of the TDC across the 4019 traces generated over a 10-m cutoff distance. Between 2015 and 2021, the observed variations indicate that the coastline is eroding with an average rate of −1.15 m/year and a progradation rate of 3.07 m/year on average.