Coastal vulnerability assessment of the West African coast to flooding and erosion

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Jan. 9, 2024

Abstract Global coastal areas are at risk due to geomorphological issues, climate change-induced sea-level rise, and increasing human population, settlements, socioeconomic activities. Here, the study examines vulnerability of West African (WA) coast using six satellite-derived geophysical variables two key parameters as indicators index (CVI). These integrated develop a CVI for WA coast. Then, regional hotspots with main that could influence how behaves can be managed identified. The results indicate 64, 17 19% had high very CVI, moderate low respectively. reveals while contribute in WA, factors, particularly population growth unsustainable development coast, play considerably larger role. Some sections more vulnerable exposed than others, those region's northwestern Gulf Guinea regions. Climate change presence may amplify these future. Hence, future economic plans should based on deep understanding local natural conditions, resource status, prevent negative ecosystem transformation. It is also essential establish management plan would facilitate desired actions stimulate sustainable areas.

Language: Английский

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Coastal Zone Changes in West Africa: Challenges and Opportunities for Satellite Earth Observations

Surveys in Geophysics, Journal Year: 2022, Volume and Issue: 44(1), P. 249 - 275

Published: July 18, 2022

Abstract The West African coastal population and ecosystems are increasingly exposed to a multitude of hazards. These likely be exacerbated by global climate change direct impacts from local human activities. Our ability understand changes has been limited an incomplete understanding the processes difficulty obtaining detailed data. Recent advances in satellite techniques have made it possible obtain rich data sets that provide solid foundation for improving adaptation strategies humanity increasing resilience sustainable development. In this article, we review layout current socio-environmental challenges together with key parameters can monitored several management programs rely on monitor indicators at regional level. social, technical scientific problems difficulties hinder interest practitioners decision-makers use identified. We roadmap precisely respond these how improved earth observation strategy better support future zone Africa.

Language: Английский

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Mangroves' role in supporting ecosystem-based techniques to reduce disaster risk and adapt to climate change: A review

Journal of Sea Research, Journal Year: 2023, Volume and Issue: 196, P. 102449 - 102449

Published: Oct. 4, 2023

Variations due to climate change like rising sea levels, recurring storm surges and changing wave conditions coupled with unsustainable development along the coast are exacerbating coastal populations' vulnerability dangers globally. The ecosystem based solution achieve sustainable is increasingly advocated in last two decades leverage nature's robust adaptive capacity protect people against its negative consequences. Mangroves maintain a rich marine biodiversity tropics subtropics crucial carbon sinks. present study thus analyses mangroves' role as ecosystem-based technique reduce disaster risk adapt using Mauritius, small island state, case study, particularly protective capacities of local species Rhizophora mucronata Lam. Bruguiera gymnorrhiza (L.) PRISMA (Preferred Reporting Items for Systematic Reviews Meta-Analyses) guidelines were used retrieve resources from Google Scholar, Web Science ScienceDirect 2002 2022 period. A total 41,789 records identified through screening filtering process only 50 studies deemed relevant study. In this context, key attributes mangrove forests found be reducing flood risk, sheltering regions during storms stabilizing coast. This lays foundation consider Brugueira nature solutions Mauritius which will importance decision makers, researchers public at large restoring degraded sites promote approaches change, enhance spatial planning better zone management.

Language: Английский

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Influence of El Niño on the variability of global shoreline position

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: June 12, 2023

Abstract Coastal zones are fragile and complex dynamical systems that increasingly under threat from the combined effects of anthropogenic pressure climate change. Using global satellite derived shoreline positions 1993 to 2019 a variety reanalysis products, here we show shorelines influence three main drivers: sea-level, ocean waves river discharge. While sea level directly affects coastal mobility, affect both erosion/accretion total water levels, rivers sediment budgets salinity-induced levels. By deriving conceptual model accounts for dominant modes variability on these drivers, interannual changes largely driven by different ENSO regimes their inter-basin teleconnections. Our results provide new framework understanding predicting climate-induced hazards.

Language: Английский

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Observing and Predicting Coastal Erosion at the Langue de Barbarie Sand Spit around Saint Louis (Senegal, West Africa) through Satellite-Derived Digital Elevation Model and Shoreline

Remote Sensing, Journal Year: 2021, Volume and Issue: 13(13), P. 2454 - 2454

Published: June 23, 2021

Coastal erosion at Saint Louis in Senegal is affecting the local population that consists of primarily fishermen communities their housing and access to sea. This paper aims quantifying urban beach Louis, Senegal, West Africa which located on northern end 13 km long Langue de Barbarie sand spit. The coastal evolution examined quantitatively over a yearly period using Pleiades sub-metric satellite imagery allows for stereogrammetry derive Digital Elevation Models (DEMs). comparison with ground truth data shows differences DEMs. Despite its interest remote areas developing countries cannot count regular surveys, accuracy satellite-derived topography same order as change itself, emphasizes current limitations. These 3D are combined decades-long Landsat Sentinel-2 derived shorelines. observations reveal spit stretching, narrowing Northern part while it lengthening downdrift Southward, independently from climatological changes wave regime. A parametric model based stochastic cyclic behaviour predicting next opening breach Louis.

Language: Английский

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Sea level variability in Gulf of Guinea from satellite altimetry

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Feb. 27, 2024

Abstract Coastal zones with dense populations, low elevations and/or inadequate adaptive capacity are on the frontline of unprecedented impacts from climate change. The Gulf Guinea (GoG), stretching Liberia to Gabon, is in particular vulnerable coastal flooding caused by local climate-induced sea level rise. In this region, interannual decadal changes remain poorly understood, mainly due a lack tide gauge stations. Here we use nearly three decades (1993–2021) satellite altimetry data study link between Equatorial Atlantic and GoG variability. rate mean rise increased 3.47 3.89 ± 0.10 mm/yr oceanic domain area, an acceleration 0.094 0.050 2 . This corresponds about 8.9 cm over entire period, 1993–2021. We focus (extreme) warm/cold events that occur both during Niños, along Angola-Namibia coast Benguela Niños. Both driven remote forcing via equatorial Kelvin waves winds, freshwater fluxes currents intensifications. Analysis altimetry-based level, surface temperature anomalies, 20 °C isotherm based PIRATA moorings, Argo-based steric thermometric allows us follow trapped (CTWs) GoG, its major observed strong warmings 2010, 2012, 2019 2021. 2021 warming have been identified as warmest event ever reported region last 40 years. A lag 1 month West African wave propagation. observation may help better anticipate manage effects extreme ecosystems, fisheries, socio-economic activities affected coastlines. order enable informed decision-making guarantee resilience communities face change, it emphasises significance ongoing field.

Language: Английский

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Future socioeconomic development along the West African coast forms a larger hazard than sea level rise

Communications Earth & Environment, Journal Year: 2023, Volume and Issue: 4(1)

Published: May 15, 2023

Abstract Sea level rise will exacerbate the vulnerability of low-lying coastal regions around world in coming decades, posing a severe threat to populations. Here, we assess future population and asset exposure West Africa (WA) normal extreme flooding based on projected sea scenarios reported IPCC Sixth Assessment Report using bathtub modeling approach, MERIT DEM gridded gross domestic product datasets that are consistent with Shared Socioeconomic Pathways. We find socioeconomic development be responsible for maximum increase along WA coast towards end century. While contributions from climate-induced dominate changes events some countries, these is likely many countries if ongoing horizontal infrastructural economic-oriented transformation continue. These results have important implications both sustainable planning risk mitigation WA’s areas should considered as cautionary tale managing increasing coastward migration at expense region’s ecosystems.

Language: Английский

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African coastal camera network efforts at monitoring ocean, climate, and human impacts

Scientific Reports, Journal Year: 2023, Volume and Issue: 13(1)

Published: Jan. 27, 2023

Abstract Regular and long-term monitoring of coastal areas is a prerequisite to avoiding or mitigating the impacts climate human-driven hazards. In Africa, where populations infrastructures are particularly exposed risk, there an urgent need establish monitoring, as observations generally scarce. Measurement campaigns very high-resolution satellite imagery costly, while freely available have temporal spatial resolutions that not suited capture event scale. To address gap, network low-cost, multi-variable, shore-based video camera systems has been installed along African coasts. Here, we present this its principle sharing data, methods, results obtained, building toward implementation common integrated management policy between countries. Further, list new contributions understanding still poorly documented beaches’ evolution, waves, sea level impacts. This solid platform for development inter-disciplinary resources ecology (such fisheries, sargassum landing), erosion flooding, early warning during extreme events, science-based infrastructure sustainable future

Language: Английский

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Urban Beach Evolution in Saint Louis, Senegal (West Africa) using Shore-Based Camera Video Monitoring as a Management Tool

Regional Studies in Marine Science, Journal Year: 2025, Volume and Issue: unknown, P. 104050 - 104050

Published: Jan. 1, 2025

Language: Английский

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An evaluation of coastal resilience policies in Anglophone West Africa through a regional comparative analysis

Marine Policy, Journal Year: 2025, Volume and Issue: 176, P. 106648 - 106648

Published: Feb. 27, 2025

Language: Английский

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