Recent coastal sea-level variations and flooding events in the Nigerian Transgressive Mud coast of Gulf of Guinea

Dada, Olusegun A.; Almar, Rafaël; Oladapo, Michael Ilesanmi

doi:10.1016/j.jafrearsci.2019.103668

Cited by 27 publications

(18 citation statements)

References 51 publications

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“…For instance, Ranasinghe et al [45] and Anderson et al [46] observed shoreline rotation at embayed beaches, and Trombetta et al [47] observed an alongshore sediment drift reversal with large consequences for coastal zone management and infrastructures. These remote swells can also drive dramatic overtopping [6] even at storm-free areas, such as in the Gulf of Guinea [1,48], facing the South Atlantic storm track, and in the Pacific due to distant tropical cyclones [17,[49][50][51].…”

Section: Summary and Discussionmentioning

confidence: 99%

Coastal Wave Extremes around the Pacific and Their Remote Seasonal Connection to Climate Modes

Boucharel

Santiago

Almar

et al. 2021

Climate

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At first order, wind-generated ocean surface waves represent the dominant forcing of open-coast morpho-dynamics and associated vulnerability over a wide range of time scales. It is therefore paramount to improve our understanding of the regional coastal wave variability, particularly the occurrence of extremes, and to evaluate how they are connected to large-scale atmospheric regimes. Here, we propose a new “2-ways wave tracking algorithm” to evaluate and quantify the open-ocean origins and associated atmospheric forcing patterns of coastal wave extremes all around the Pacific basin for the 1979–2020 period. Interestingly, the results showed that while extreme coastal events tend to originate mostly from their closest wind-forcing regime, the combined influence from all other remote atmospheric drivers is similar (55% local vs. 45% remote) with, in particular, ~22% coming from waves generated remotely in the opposite hemisphere. We found a strong interconnection between the tropical and extratropical regions with around 30% of coastal extremes in the tropics originating at higher latitudes and vice-versa. This occurs mostly in the boreal summer through the increased seasonal activity of the southern jet-stream and the northern tropical cyclone basins. At interannual timescales, we evidenced alternatingly increased coastal wave extremes between the western and eastern Pacific that emerge from the distinct seasonal influence of ENSO in the Northern and SAM in the Southern Hemisphere on their respective paired wind-wave regimes. Together these results pave the way for a better understanding of the climate connection to wave extremes, which represents the preliminary step toward better regional projections and forecasts of coastal waves.

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Section: Summary and Discussionmentioning

confidence: 99%

Coastal Wave Extremes around the Pacific and Their Remote Seasonal Connection to Climate Modes

Boucharel

Santiago

Almar

et al. 2021

Climate

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“…Large stretches of the transgressive mud coast comprise loose clayey deposits, with steep mud and have been subjected to inundation, flooding, and shoreline erosion due to the extensive destruction of the mangrove forests and overgrazing of the salt marshes along the coast (Fashae & Onafeso, 2011;Popoola, 2021). Rising sea levels are observed along the Transgressive Mud Coast and this is caused by wave run-up and astronomical tides (Dada et al 2020). Likewise, flooding events on the coast are caused by the interaction of large wave run-ups and astronomical tides (Dada et al 2020).…”

Section: Study Areamentioning

confidence: 99%

“…Rising sea levels are observed along the Transgressive Mud Coast and this is caused by wave run-up and astronomical tides (Dada et al 2020). Likewise, flooding events on the coast are caused by the interaction of large wave run-ups and astronomical tides (Dada et al 2020). In terms of socio-economic characteristics, the population presently stands at 543,259 using the RCP8.5 projections.…”

Section: Study Areamentioning

confidence: 99%

Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

Popoola

2022

ESJ

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This study investigated changes due to erosion and the consequences of rising sea levels on the Transgressive mud coast of Nigeria using multispectral Landsat images and ALOS PALSAR (AW3D30) elevation models with the view of proffering a management strategy for a sustainable coast. Endpoint Rate (EPR) and Linear Regression Rate (LRR) techniques within the Digital Shoreline Analysis System (DSAS) were used to assess the rates of changes along the shoreline between 1986 and 2021. Inundation models were developed in line with sea-level rise scenarios of the Green House Gas emissions (SSP5-8.5) with GIS to assess sea-level rise’s impact on land and structures. Likewise, spatially disaggregated population and economic activity datasets projected to the year 2100 were overlaid on the inundation models to generate exposure indices for the coast. The study revealed that 49.8 km (64.67%) of the shoreline experienced retreat over the entire study period. This rapid rate of shoreline retreat has caused a land loss of 15.1 sq. km to the Atlantic over the last 35 years, which could trigger an additional 1.26 sq. km by the year 2032. Furthermore, the impact of sea-level rise is severe on the transgressive coast triggering submergence of the mud coast by inundation to the extent of 201 sq. km which will increase to 551 sq. km by 2100. Losses in terms of structures, population, and economic activity are recorded. To curtail the ongoing coastal changes, the study recommends the full adoption of the shoreline management plan (SMP) for sustainable shoreline management.

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“…Therefore, for optimal flood mapping, monitoring, and enhanced early warning signals, microwave active sensors stand to be the most reliable, such as the Radar. The use of Radar in flood studies in Africa has been growing over the years (Barasa & Wanyama, 2020;Dada et al, 2020;DeVries et al, 2020;Di Baldassarre et al, 2011;Lundberg, 2020;Rebelo, 2010;Rosenqvist et al, 1999). However, its use in Western Africa for monitoring flood events is just emerging (Dada et al, 2020;Frappart et al, 2015;Kouassi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The use of Radar in flood studies in Africa has been growing over the years (Barasa & Wanyama, 2020;Dada et al, 2020;DeVries et al, 2020;Di Baldassarre et al, 2011;Lundberg, 2020;Rebelo, 2010;Rosenqvist et al, 1999). However, its use in Western Africa for monitoring flood events is just emerging (Dada et al, 2020;Frappart et al, 2015;Kouassi et al, 2020). This study, therefore, is aimed at assessing the 2018 flood event in Lokoja, Kogi State, Nigeria, using the Dual Polarimetric Synthetic Aperture Radar (SAR) imagery, a European Space Agency (ESA) product, for effective flood risk assessment and management.…”

Section: Introductionmentioning

confidence: 99%

An assessment of flood event along Lower Niger using Sentinel-1 imagery

Adedeji

Olusola

Babamaaji

et al. 2021

Environ Monit Assess

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The study confirmed that a total of 69 buildings out of 611 buildings were affected by the flood disaster with about 24,902 people displaced by this singular flood event. The study shows that backscattering from microwave sensors provides very useful information for highlighting inundated areas that could prove useful in forecasting, monitoring, and precision-based flood early warning designs before, during, and after flood events.

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Recent coastal sea-level variations and flooding events in the Nigerian Transgressive Mud coast of Gulf of Guinea

Cited by 27 publications

References 51 publications

Coastal Wave Extremes around the Pacific and Their Remote Seasonal Connection to Climate Modes

Coastal Wave Extremes around the Pacific and Their Remote Seasonal Connection to Climate Modes

Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

An assessment of flood event along Lower Niger using Sentinel-1 imagery

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