Ibrahima Pouye^1,2, Dieudonné Pessièzoum Adjoussi³, Jacques André Ndione⁴, Amadou Sall⁵, Kouami Dodji Adjaho³, Muhammad Leroy Albert Gomez^1,2

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¹ West African Science Service Center on Climate Change and Adapted Land Use, WASCAL, Togo.
² University of Lomé DRP Climate Change Disaster Risk Management, Lomé, Togo.
³ Department of Geography, University of Lomé, Lomé, Togo.
⁴ Académie Nationale des Sciences et Techniques du Sénégal (ANSTS), Dakar, Senegal.
⁵ Centre de Suivi Ecologique, Dakar, Senegal.
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Abstract: In the context of climate change, the study of shoreline dynamics is a critical issue concerning economic losses in coastal countries. Therefore, since it is an important parameter to study the impacts of climate change in coastal areas, scientists are more interested in littoral studies seeking deep existential knowledge. This study aims to depict separately the coastal dynamics from 1990 to 2020 in Dakar region. The difference in terms of geologic, geomorphologic and hydrodynamic conditions within the three different coasts of Dakar and the prediction until 2040 have been taken into account in comparison to the previous studies. To achieve this purpose, the Geographic Information System (GIS) approach which is among the most current methods to determine the coastline dynamics is used. Historical Landsat images from the USGS, QGIS 3.12.0, Arc GIS 10.4 and DSAS software have been used for the Landsat images pre-processing and coastline dynamic computation. After obtaining the coastline velocity rate, some predictions of future coastline position have been estimated using the formula of velocity. The results showed that the Dakar region is characterized by an average rate of retreat about −0.44 m/year on the northern coast. The western and southern coasts record respectively a rate of about 0.21 and −0.11 m/year. In 2030, the average rates of retreat of −4.4, 2.1 and −1.1 m/year were estimated respectively in the northern, western and southern coasts.

Keywords: Coastline Dynamics, DSAS, Erosion, Accretion, Dakar Region

Cite this paper: Pouye, I. , Adjoussi, D. , Ndione, J. , Sall, A. , Adjaho, K. and Gomez, M. (2022) Coastline Dynamics Analysis in Dakar Region, Senegal from 1990 to 2040. American Journal of Climate Change, 11, 23-36. doi: 10.4236/ajcc.2022.112002.

References

[1]   Adjoussi, P. (2001). Impacts du prélèvement du sable marin sur l’évolution du trait de côte a Yoff: Essai d’étude de vulnérabilité (Presqu’île du Cap Vert, Sénégal). UCAD.

[2]   ANSD (2007). Situation économique et sociale du Sénégal, Rapport préparé et publié par l’ANDS 2007. Recherche Google.

[3]   Bakhoum, P. W., Diaw, A., & Sambou, B. (2018a). A Peninsula in Coastal Erosion? Dakar, the Senegalese Capital City Facing the Sea Level Rise in the Context of Climate Change. EWASH & TI Journal, 1, 92-109.
https://www.researchgate.net/publication/324877729

[4]   Bakhoum, P. W., Niang, I., Sambou, B., & Diaw, A. T. (2018b). Physical Vulnerability of Dakar Region Facing Sea Levels Risings in the Context of Climate Change. EWASH & TI Journal, 2, 11-26.

[5]   Bird, E. (2008). Coastal Geomophology: An Introduction (2nd ed.). Wiley.

[6]   Chand, P., & Acharya, P. (2010). Shoreline Change and Sea Level Rise along Coast of Bhitarkanika Wildlife Sanctuary, Orissa: An Analytical Approach of Remote Sensing and Statistical Techniques. International Journal of Geomatics and Geosciences, 28, 436-455.

[7]   Crowell, M., Douglas, B. C., & Leatherman, S. P. (1997). On Forecasting Future U.S. Shoreline Positions: A Test of Algorithms. Journal of Coastal Research, 13, 1245-1255.
http://www.jstor.org/stable/4298734

[8]   Dolan, R., Fenster, M. S., & Holme, S. J. (1991). Temporal Analysis of Shoreline Recession and Accretion. Journal of Coastal Research, 7, 723-744.
https://www.jstor.org/stable/4297888

[9]   Faye, I. N. (2010). Dynamique du trait de côte sur les littoraux sableux de la Mauritanie à la Guinée-Bissau (Afrique de l’Ouest): Approches régionale et locale par photo-interprétation, traitement d’images et analyse de cartes anciennes. Université de Bretagne Occidentale-Brest.

[10]   Guariglia, A., Buonamassa, A., Losurdo, A., Saladino, R., Trivigno, M. L., Zaccagnino, A., & Colangelo, A. (2006). A Multisource Approach for Coastline Mapping and Identification of Shoreline Changes. Annals of Geophysics, 49, 295-304.

[11]   Himmelstoss, E. A., Henderson, R. E., Kratzmann, M. G., & Farris, A. S. (2018). Digital Shoreline Analysis System (DSAS) Version 5.0 User Guide. Open-File Report.
https://doi.org/10.3133/ofr20181179

[12]   Kumar, A., Narayana, A. C., & Jayappa, K. S. (2010). Shoreline Changes and Morphology of Spits along Southern Karnataka, West Coast of India: A Remote Sensing and Statistics-Based Approach. Geomorphology, 120, 133-152.
https://doi.org/10.1016/j.geomorph.2010.02.023

[13]   Niang-Diop, I. (1996). L’érosion côtière sur la petite côte du Sénégal à partir de l’ensemble de Rufisque: Passé, présent et futur. Université d’Angers.

[14]   Oyedotun, T. D. T. (2014). Shoreline Geometry: DSAS as a Tool for Historical Trend Analysis. In Geomorphological Techniques (Online Edition). British Society for Geomorphology.

[15]   Pouye, I. (2016). Modification des conditions climatiques et avancée de la mer au niveau de la côte nord de la presqu’île du Cap-Vert (De Yoff à Guédiawaye) de 1984 à 2014: Enjeux et Perspectives. Universié Cheikh Anta Diop de Dakar.

[16]   Quensière, J., Retiere, A., Kane, A., Gaye, A. T., Ly, I., Seck, S., Royer, C., Gerome, C., & Peresse, A. (2013). Vulnérabilités de la région de Dakar au changement climatique: PCTI-Dakar. IRD, 118 p.

[17]   Sane, M., & Yamagishi, H. (2004). Coastal Erosion in Dakar, Western Senegal. Journal of the Japan Society of Engineering Geology, 44, 360-366.
https://doi.org/10.5110/jjseg.44.360

[18]   Strahler, A. (2013). Introducing Physical Geography (6th ed.). Wiley.

[19]   Taylor, J. R. (1997). An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements. University Science Books.
https://books.google.sn/books?id=ypNnQgAACAAJ

[20]   Thieler, E. R., Himmelstoss, E. A., Zichichi, J. L., & Ergul, A. (2009). The Digital Shoreline Analysis System (DSAS) Version 4.0—An ArcGIS Extension for Calculating Shoreline Change. Open-File Report.
https://doi.org/10.3133/ofr20081278

[21]   Weissenberger, S., Noblet, M., Plante, S., Chouinard, O., Guillemot, J., Aubé, M., Meur-Ferec, C., Michel-Guillou, E., Gaye, N., Kane, A., Kane, C., Niang, A., & Seck, A. (2016). Changements climatiques, changements du littoral et évolution de la vulnérabilité côtière au fil du temps: Comparaison de territoires Français, Canadien et Sénégalais. VertigO, 16, 1-43.
https://doi.org/10.4000/vertigo.18050