Evolutive Trend of Water Level in the Ebrie Lagoon by Reconstitution of the Tide Gauge Time Series in Front of the Abidjan Coastline (Côte d’Ivoire) — Oak Academic Publishing
Research ArticleOpen AccessGoogle Scholar indexed
Evolutive Trend of Water Level in the Ebrie Lagoon by Reconstitution of the Tide Gauge Time Series in Front of the Abidjan Coastline (Côte d’Ivoire)
Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
,
Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
,
Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
,
Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
,
Department of Hydrography, Autonomous Port of Abidjan, Abidjan, Côte d’Ivoire
,
Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
1 Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
2 Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
3 Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
4 Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
5 Department of Hydrography, Autonomous Port of Abidjan, Abidjan, Côte d’Ivoire
6 Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Côte d’Ivoire
The latest Intergovernmental Panel on Climate Change (IPCC) report shows that sea-level rise, which has been accelerated since the 19th century resulting to the global warming, threatens coastal areas with high population growth. A Global Sea Level Observing System (GLOSS) assessment highlighted the lack of data in Africa, and in C ô te d’Ivoire in particular. In order to estimate the evolutionary trend of sea level along the Ivorian coast, and to draw up preventive plans to protect properties and populations, we digitized 65 years of historical tidegrams recorded in the Ebrie Lagoon, using the “Surfer” and “Nunieau” software, then processed them using “T-Tide” and “U-Tide” software. The average levels were calculated using the Demerliac filter from complete daily (day and night) recordings for providing a usable database of 31 years of hourly lagoon data from 1979 to 2015. Our results show that a mean water level in lagoon is 1.04 m. The evolutionary trend in sea level, estimated in the lagoon via the Vridi canal, during the rainy season is the most significant at 2.93 mm/year. This is followed by the dry season, with a trend of 2.89 mm/year. The flood season trend is 2.78 mm/year. This suggests that marine water inflows dominate continental inflows. Our results highlight the vulnerability of C ô te d’Ivoire’s coasts to the risk of marine submersion.
KeywordsTideMean Water LevelTemporal VariabilityVridi ChannelMarine Submersion
Zhang, K., Douglas, B.C. and Leatherman, S.P. (2004) Global Warming and Coastal Erosion. Climatic Change, 64, 41-58. https://doi.org/10.1023/B:CLIM.0000024690.32682.48
Dwarakish, G.S., Vinay, S.A., Natesan, U., Asano, T., Kakinumat., Venkataramana, K., Pai B.J. and Babita, M.K. (2009) Coastal Vulnerability Assessment of the Future Sea Level Rise in Udupi Coastal Zone of Karnataka State, West Coast of India. Ocean & Coastal Management, 52, 467-478. https://doi.org/10.1016/j.ocecoaman.2009.07.007
Gornitz, V.M., Couch, S. and Hartig, E.K. (2002) Impacts of Sea Level Rise in the New York City Metropolitan Area. Global and Planetary Changes, 32, 61-88. https://doi.org/10.1016/S0921-8181(01)00150-3
Snoussi, M., Ouchani, T., Khouakhi, A. and Niang-diop, I. (2009) Impacts of Sea-Level Rise on the Moroccan Coastal Zone: Quantifying Coastal Erosion and Flooding of the Tangier Bay. Geomorphology, 107, 32-40. https://doi.org/10.1016/j.geomorph.2006.07.043
PSMSL (Permanent Service for Mean Sea Level). Database. http://www.psmsl.org/
Woppelmann, G., Martin, M.B. and Creach, R. (2008) Tide Gauge Records at Dakar, Senegal (Africa): Toward a 100 Years Consistent Sea-Level Time Series. Poster Presented at European Geophysical Union (EGU), Vienna, 13-18 April 2008, 1.
Saley, M.B., Danumah, J.H., Sorokoby, V.M., Kanohin, F.O., Atcheremi, D., Denean, S.P., Kouame, F.K. and Djagoua, V.E. (2013) Methodology for the Mapping of Areas Vulnerable to Flooding by Geographic Information System and Multi-Criteria Analysis: Application to the Watershed of the Davo at Sassandra (South-West of the Ivory Coast). Africa Geoscience Review, 20, 21-33.
Varlet, F. (1958) Le régime de l’Atlantique près d’Abidjan (Cote d’Ivoire). Etudes éburnéennes, 6, 97-222.
Durand, J.R., Guiral, D., Dufour, P. and Zabi, G.F. (1994) Hydroclimate and Hydrochemistry. In: Environment and Aquatic Resources of Ivory Coast: Lagoon Environments, Volume 2, ORSTOM, Paris, 59-90.
Koffi, K.P., Abe, L. and Amon-Kothias, J.-B. (1991) Contribution to the Study of Hydro-Sedimentary Modifications Following the Artificial Reopening of the Mouth of the Comoe at Grand-Bassam. Ivorian Journal of Oceanology and Limnology, No. 1-2, 47-60.
Vilibic, I. (2006) The Role of the Fundamental Seiche in the Adriatic Coastal Floods. Continental Shelf Research, 26, 206-216. https://doi.org/10.1016/j.csr.2005.11.001
Tomasin, A. and Pirazzoli, P.A. (1999) The Seiches in the Adriatic Sea. Atti Istituto Veneto di Scienze Lettere ed Arti CLVII, Venezia, 299-316.
Ferret, Y. (2016) Reconstruction of the Saint-Nazaire tide gauge series. Report n° 27 SHOM/DOPS/HOM/MAC/NP, 122.
Gloss (2009) Quality Control of Sea Level Observations. Version 0.1. Global Sea Level Observing System, 29 p.
Pugh, D.T. (1987) Tides, Surges and Mean Sea Level. John Wiley & Sons, Hoboken, 472 p.
Legendre, A.M. (1806) New Methods for Determining the Orbits of Comets. Appendix on the Method of Least Squares, Paris.
Gauss, C.F. (1809) Teoria motus corporum caelestium, Hamburg.
Pirazzoli, P.A. (1986) Secular Trends of Relative Sea-Level (RSL) Changes Indicated by Tide-Gauge Records. Journal of Coastal Research, No. 1, 1-26.
Samassy, R.Y., Yao, K.S., Saimon, A.M.A., Konan, K.E., Mondé, S. and Affian, K. (2022) Conversion of Historical Coastal Tide Gauge Records in Abidjan into Digital Data Using “Surfer Software”. Fiches Techniques et Documents de Vulgarisation du Centre de Recherches Océanologiques Abidjan, Volume 2, Aout 2022, 34-39.
Samassy, R. (2019) Semi-Secular Tide Gauge Measurements at the Port of Abidjan (Ivory Coast): Methods, Sea Level Evolutionary Trend and Coastal Vulnerabilities. UFHB Thesis Report, 229 p.
Monde, S. (2004) Study and Hydrodynamic Modeling of the Circulation of Water Masses in the Ebrié Lagoon (Ivory Coast). PhD Thesis, Univ Abidjan, Abidjan, 324 p.
Gouriou, T. (2012) Evolution of Sea Level Components from Tide Gauge Observations Made since the End of the 18th Century in Charente-Maritime. Sciences de la Terre. PhD Thesis, University of La Rochelle, Rochelle, 475 p.
Simon, B. (2007) La marée océanique cotière. Institut océanographique, Paris, 433 p.
UNESCO (1985) Manual on Sea-Level Measurement and Interpretation. Volume I, Basic Procedures. Intergovernmental Oceanographic Commission, Manuals and Guides, No. 14, 78 p.
Tano, R., Aman, A., Toualy, E., Kouadio, Y., Francois-Xavier, B. and Addo, K. (2018) Développement d’un indice intégré de vulnérabilité cotière pour la Cote d’Ivoire en Afrique de l’Ouest. Journal of Environmental Protection, 9, 1171-1184. https://doi.org/10.4236/jep.2018.911073
Tano, A.R. (2017) Etude de la vulnerabilite de la zone cotiere de la Cote d’ivoire à partir de paramêtres environnementaux et anthropiques. Doctoral Thesis, Univ. H-Boigny, Boigny, 151 p.
Aman, A. (2015) Comprehensive Report on the Tide Gauges Which Have Operated along the African Coasts and Adjacent islands. Contract UNESCO 4500276963, 48 p.
Aman, A., Tano, R.A., Toualy, E., Silue, F., Addo, K.A. and Folorunsho, R. (2019) Physical Forcing Induced Coastal Vulnerability along the Gulf of Guinea. Journal of Environmental Protection, 10, 1194-1211. https://doi.org/10.4236/jep.2019.109071
Woodworth, P.L., Foden, P., Pugh, J., Mathews, A., Aarup, T., Aman, A., Nkebi, E., Odametey, J., Facey, R., Esmail, M.Y.A. and Ashraf, M. (2009) Insight into Long Term Sea Level Change Based on New Tide Gauge Installations at Takoradi, Aden and Karachi. International Hydrographic Review, May 2009, 18-23.
Samassy, R., Djé, K.B., Yeo, E.W., Sangaré, S. and Mondé, S. (2017) Impacts of Natural Forcings in the Seasonal Variability of the Tide Gauge Signal of the Abidjan Coastline (Ivory Coast). Bioterre, 17, 62-76.