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)  

作　　者：Samassy Rokyatou Yéo Kokoa Chia Marie Reine Allialy Tano Anoumou Rene Mondé Sylvain Sangaré Seydou Kouadio Affian Samassy Rokyatou Yéo;Kokoa Chia Marie Reine Allialy;Tano Anoumou Rene;Mondé Sylvain;Sangaré Seydou;Kouadio Affian(Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Cô,te d’Ivoire;Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Cô,te d’Ivoire;Department of Hydrography, Autonomous Port of Abidjan, Abidjan, Cô,te d’Ivoire)

机构地区：[1]Laboratory of Geology Mining Resources and Energy, Felix Houphouet Boigny University, Abidjan, Cô,te d’Ivoire [2]Laboratory of Fundamental and Applied Physic, Nangui Abrogoua University, Abidjan, Cô,te d’Ivoire [3]Department of Hydrography, Autonomous Port of Abidjan, Abidjan, Cô,te d’Ivoire

出　　处：《Journal of Water Resource and Protection》2023年第10期526-538,共13页水资源与保护（英文）

摘　　要：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 Côte 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 Côte d’Ivoire’s coasts to the risk of marine submersion.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 Côte 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 Côte d’Ivoire’s coasts to the risk of marine submersion.

关 键 词：TIDE Mean Water Level Temporal Variability Vridi Channel Marine Submersion 

分 类 号：P73[天文地球—海洋科学]