Sea-level rise, marine storms and the resilience of Mediterranean coastal wetlands: lessons learned from the Ebro Delta
Carles Ibáñez A B C and Nuno Caiola A BA Climate Resilience Center (CRC), Amposta, Spain.
B Department of Climate Change, Technology Center of Catalonia EURECAT, Amposta, Spain.
C Corresponding author. Email: carles.ibanez@eurecat.org
Marine and Freshwater Research 73(10) 1246-1254 https://doi.org/10.1071/MF21140
Submitted: 17 May 2021 Accepted: 9 November 2021 Published: 7 December 2021
Abstract
Understanding the effects of sea-level rise (SLR) and marine storms on Mediterranean coastal wetlands is crucial to developing adequate climate change adaptation pathways. Because the majority of these systems are in deltaic areas, integrated river basin management (water and sediment discharge) is a must in the design of such pathways. Rising sea levels will tend to gradually flood coastal lagoons and marshes unless there is enough sediment supplied to compensate for the increasing deficit. Although the relationship between climate change and Mediterranean coastal storms is weak or non-existent, their impacts are expected to grow in the context of SLR and coastal squeezing. For example, the most affected Ebro Delta coastal stretches during the Gloria storm (January 2020), one of the most intense ever recorded in the Mediterranean, were those where the beach was narrower and weaker. Hard engineering solutions, such as the construction of dykes, as a protection measure against marine storms are not sustainable under scenarios of climate change and energy scarcity. A management approach based on soft engineering coastal defences and nature-based solutions is the most cost-effective and sustainable in the long run. The adequacy of implementing this kind of solution along the Mediterranean coast is discussed.
Keywords: climate change, coast, deltas, Mediterranean, nature-based solutions, sea level rise, wetlands.
References
Amores, A., Marcos, M., Carrió, D. S., and Gómez-Pujol, L. (2020). Coastal impacts of Storm Gloria (January 2020) over the north-western Mediterranean. Natural Hazards and Earth System Sciences 20, 1955–1968.| Coastal impacts of Storm Gloria (January 2020) over the north-western Mediterranean.Crossref | GoogleScholarGoogle Scholar |
Bellafiore, D., Ferrarin, C., Maicu, F., Manfè, G., Lorenzetti, G., Umgiesser, G., Zaggia, L., and Valle-Levinson, A. (2021). Saltwater intrusion in a Mediterranean Delta under a changing climate. Journal of Geophysical Research. Oceans 126, e2020JC016437.
| Saltwater intrusion in a Mediterranean Delta under a changing climate.Crossref | GoogleScholarGoogle Scholar |
Blanco, M., Fernandes, D., Rizzi, J., Huertas, D., Caiola, N., Fernández, P., and Porte, C. (2018). The combined use of chemical and biochemical markers in Rutilus rutilus to assess the effect of dredging in the lower course of the Ebro River. Ecotoxicology and Environmental Safety 155, 9–16.
| The combined use of chemical and biochemical markers in Rutilus rutilus to assess the effect of dredging in the lower course of the Ebro River.Crossref | GoogleScholarGoogle Scholar | 29494836PubMed |
Caiola, N., Ibáñez, C., Verdú, J., and Munné, A. (2014). Effects of flow regulation on the establishment of alien fish species: a community structure approach to biological validation of environmental flows. Ecological Indicators 45, 598–604.
| Effects of flow regulation on the establishment of alien fish species: a community structure approach to biological validation of environmental flows.Crossref | GoogleScholarGoogle Scholar |
Canicio, A., and Ibàñez, C. (1999). The Holocene evolution of the Ebro Delta, Catalonia, Spain. Acta Geographica Sinica 54, 462–469.
Clark, P. U., Shakun, J. D., Marcott, S. A., Mix, A. C., Eby, M., Kulp, S., Levermann, A., Milne, G. A., Pfister, P. L., Santer, B. D., Schrag, D. P., Solomon, S., Stocker, T. F., Strauss, B. H., Weaver, A. J., Winkelmann, R., Archer, D., Bard, E., Goldner, A., Lambeck, K., Pierrehumbert, R. T., and Plattner, G. K. (2016). Consequences of twenty-first-century policy for multi-millennial climate and sea-level change. Nature Climate Change 6, 360–369.
| Consequences of twenty-first-century policy for multi-millennial climate and sea-level change.Crossref | GoogleScholarGoogle Scholar |
Collados-Lara, A. J., Pulido-Velazquez, D., Mateos, R. M., and Ezquerro, P. (2020). Potential impacts of future climate change scenarios on ground subsidence. Water 12, 219.
| Potential impacts of future climate change scenarios on ground subsidence.Crossref | GoogleScholarGoogle Scholar |
Courchamp, F., Hoffmann, B. D., Russell, J. C., Leclerc, C., and Bellard, C. (2014). Climate change, sea-level rise, and conservation: keeping island biodiversity afloat. Trends in Ecology & Evolution 29, 127–130.
| Climate change, sea-level rise, and conservation: keeping island biodiversity afloat.Crossref | GoogleScholarGoogle Scholar |
Day, J. W., Pont, D., Hensel, P. F., and Ibañez, C. (1995). Impacts of sea-level rise on deltas in the Gulf of Mexico and the Mediterranean: the importance of pulsing events to sustainability. Estuaries 18, 636–647.
| Impacts of sea-level rise on deltas in the Gulf of Mexico and the Mediterranean: the importance of pulsing events to sustainability.Crossref | GoogleScholarGoogle Scholar |
Day, J. W., Rybczyk, J., Scarton, F., Rismondo, A., Are, D., and Cecconi, G. (1999). Soil accretionary dynamics, sea-level rise and the survival of wetlands in Venice Lagoon: a field and modelling approach. Estuarine, Coastal and Shelf Science 49, 607–628.
| Soil accretionary dynamics, sea-level rise and the survival of wetlands in Venice Lagoon: a field and modelling approach.Crossref | GoogleScholarGoogle Scholar |
Day, J. W., Barras, J., Clairain, E., Johnston, J., Justic, D., Kemp, G. P., Ko, J. Y., Lane, R., Mitsch, W. J., Steyer, G., Templet, P., and Yanez-Arancibia, A. (2005). Implications of global climatic change and energy cost and availability for the restoration of the Mississippi Delta. Ecological Engineering 24, 253–265.
| Implications of global climatic change and energy cost and availability for the restoration of the Mississippi Delta.Crossref | GoogleScholarGoogle Scholar |
Day, J. W., Christian, R. R., Boesch, D. M., Yáñez-Arancibia, A., Morris, J., Twilley, R. R., Naylor, L., Schaffner, L., and Stevenson, C. (2008). Consequences of climate change on the ecogeomorphology of coastal wetlands. Estuaries and Coasts 31, 477–491.
| Consequences of climate change on the ecogeomorphology of coastal wetlands.Crossref | GoogleScholarGoogle Scholar |
DeConto, R. M., and Pollard, D. (2016). Contribution of Antarctica to past and future sea-level rise. Nature 531, 591–597.
| Contribution of Antarctica to past and future sea-level rise.Crossref | GoogleScholarGoogle Scholar | 27029274PubMed |
Defne, Z., Aretxabaleta, A. L., Ganju, N. K., Kalra, T. S., Jones, D. K., and Smith, K. E. (2020). A geospatially resolved wetland vulnerability index: synthesis of physical drivers. PLoS One 15, e0228504.
| A geospatially resolved wetland vulnerability index: synthesis of physical drivers.Crossref | GoogleScholarGoogle Scholar | 31999806PubMed |
Elshinnawy, I. A., and Almaliki, A. H. (2021). Vulnerability assessment for sea level rise impacts on coastal systems of Gamasa Ras El Bar Area, Nile Delta, Egypt. Sustainability 13, 3624.
| Vulnerability assessment for sea level rise impacts on coastal systems of Gamasa Ras El Bar Area, Nile Delta, Egypt.Crossref | GoogleScholarGoogle Scholar |
Emir Akbulut, N., and Tavşanoğlu, Ü. N. (2018). Impacts of environmental factors on zooplankton taxonomic diversity in coastal lagoons in Turkey. Turkish Journal of Zoology 42, 68–78.
| Impacts of environmental factors on zooplankton taxonomic diversity in coastal lagoons in Turkey.Crossref | GoogleScholarGoogle Scholar |
Frihy, O. E. (2003). The Nile Delta–Alexandria coast: vulnerability to sea-level rise, consequences and adaptation. Mitigation and Adaptation Strategies for Global Change 8, 115–138.
| The Nile Delta–Alexandria coast: vulnerability to sea-level rise, consequences and adaptation.Crossref | GoogleScholarGoogle Scholar |
Gambolati, G., Teatini, P., and Gonella, M. (2002). GIS simulations of the inundation risk in the coastal lowlands of the Northern Adriatic Sea. Mathematical and Computer Modelling 35, 963–972.
| GIS simulations of the inundation risk in the coastal lowlands of the Northern Adriatic Sea.Crossref | GoogleScholarGoogle Scholar |
Gascón, S., Arranz, I., Cañedo-Argüelles, M., Nebra, A., Ruhí, A., Rieradevall, M., Caiola, N., Sala, J., Ibàñez, C., Quintana, X. D., and Boix, D. (2016). Environmental filtering determines metacommunity structure in wetland microcrustaceans. Oecologia 181, 193–205.
| Environmental filtering determines metacommunity structure in wetland microcrustaceans.Crossref | GoogleScholarGoogle Scholar | 26781303PubMed |
Genua-Olmedo, A., Alcaraz, C., Caiola, N., and Ibàñez, C. (2016). Sea level rise impacts on rice production: the Ebro Delta as an example The Science of the Total Environment 571, 1200–1210.
| Sea level rise impacts on rice production: the Ebro Delta as an exampleCrossref | GoogleScholarGoogle Scholar | 27481453PubMed |
Grases, A., Gracia, V., García-León, M., Lin-Ye, J., and Sierra, J. P. (2020). Coastal flooding and erosion under a changing climate: Implications at a low-lying coast (Ebro Delta). Water 12, 346.
| Coastal flooding and erosion under a changing climate: Implications at a low-lying coast (Ebro Delta).Crossref | GoogleScholarGoogle Scholar |
Higgins, S. A. (2016). Advances in delta-subsidence research using satellite methods. Hydrogeology Journal 24, 587–600.
| Advances in delta-subsidence research using satellite methods.Crossref | GoogleScholarGoogle Scholar |
Hinkel, J., Aerts, J. C., Brown, S., Jiménez, J. A., Lincke, D., Nicholls, R. J., Scussolini, P., Sánchez-Arcilla, A., Vafeidis, A., and Addo, K. A. (2018). The ability of societies to adapt to twenty-first-century sea-level rise. Nature Climate Change 8, 570–578.
| The ability of societies to adapt to twenty-first-century sea-level rise.Crossref | GoogleScholarGoogle Scholar |
Hzami, A., Heggy, E., Amrouni, O., Mahé, G., Maanan, M., and Abdeljaouad, S. (2021). Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa. Scientific Reports 11, 2320.
| Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa.Crossref | GoogleScholarGoogle Scholar | 33504845PubMed |
Ibàñez, C. (2020). El Delta de l’Ebre, un ecosistema amenaçat: causes i solucions. In ‘Sobre el temporal Gloria (19–23.01.20), els seus efectes sobre el país i el que se’n deriva: Report de Resposta Ràpida (R3)’. (Eds M. Canals and J. Miranda.). pp. 81–92. (Primera Edició, Institut d’Estudis catalans, Secció de Ciències i Tecnologia: Barcelona, Spain.)
Ibàñez, C., Prat, N., and Canicio, A. (1996). Changes in the hydrology and sediment transport produced by large dams on the lower Ebro river and its estuary. Regulated Rivers 12, 51–62.
| Changes in the hydrology and sediment transport produced by large dams on the lower Ebro river and its estuary.Crossref | GoogleScholarGoogle Scholar |
Ibàñez, C., Canicio, A., Day, J. W., and Curcó, A. (1997). Morphologic development, relative sea level rise and sustainable management of water and sediment in the Ebro Delta, Spain. Journal of Coastal Conservation 3, 191.
| Morphologic development, relative sea level rise and sustainable management of water and sediment in the Ebro Delta, Spain.Crossref | GoogleScholarGoogle Scholar |
Ibañez, C., Curcó, A., Day, J. W., and Prat, N. (2002). Structure and productivity of microtidal Mediterranean coastal marshes. In ‘Concepts and Controversies in Tidal Marsh Ecology’. (Eds M. P. Weinstein and D. A. Kreeger.) pp. 107–136. (Kluwer Academic Publishers: Dordrecht, Netherlands.)
Ibáñez, C., Day, J. W., and Reyes, E. (2014). The response of deltas to sea-level rise: natural mechanisms and management options to adapt to high-end scenarios. Ecological Engineering 65, 122–130.
| The response of deltas to sea-level rise: natural mechanisms and management options to adapt to high-end scenarios.Crossref | GoogleScholarGoogle Scholar |
Ibáñez, C., Alcaraz, C., Caiola, N., Prado, P., Trobajo, R., Benito, X., Day, J. W., Reyes, E., and Syvitski, J. P. M. (2019). Basin-scale land use impacts on world deltas: human vs natural forcings. Global and Planetary Change 173, 24–32.
| Basin-scale land use impacts on world deltas: human vs natural forcings.Crossref | GoogleScholarGoogle Scholar |
Ibáñez, C., Caiola, N., and Belmar, O. (2020). Environmental flows in the lower Ebro River and Delta: current status and guidelines for a holistic approach. Water 12, 2670.
| Environmental flows in the lower Ebro River and Delta: current status and guidelines for a holistic approach.Crossref | GoogleScholarGoogle Scholar |
Ingebritsen, S. E., and Galloway, D. L. (2014). Coastal subsidence and relative sea level rise. Environmental Research Letters 9, 091002.
| Coastal subsidence and relative sea level rise.Crossref | GoogleScholarGoogle Scholar |
Jiménez, J. A., and Sánchez-Arcilla, A. (1993). Medium-term coastal response at the Ebro Delta, Spain. Marine Geology 114, 105–118.
| Medium-term coastal response at the Ebro Delta, Spain.Crossref | GoogleScholarGoogle Scholar |
Kondolf, G. M., Gao, Y., Annandale, G. W., Morris, G. L., Jiang, E., Zhang, J., Cao, Y., Carling, P., Fu, K., Guo, Q., Hotchkiss, R., Peteuil, C., Sumi, T., Wang, H. W., Wang, Z., Wei, Z., Wu, B., Wu, C., and Yang, C. T. (2014). Sustainable sediment management in reservoirs and regulated rivers: experiences from five continents. Earth’s Future 2, 256–280.
| Sustainable sediment management in reservoirs and regulated rivers: experiences from five continents.Crossref | GoogleScholarGoogle Scholar |
López-Dóriga, U., and Jiménez, J. A. (2020). Impact of relative sea-level rise on low-lying coastal areas of Catalonia, NW Mediterranean, Spain. Water 12, 3252.
| Impact of relative sea-level rise on low-lying coastal areas of Catalonia, NW Mediterranean, Spain.Crossref | GoogleScholarGoogle Scholar |
Marcos, M., Jorda, G., Le Cozannet, G., Moatti, J., and Thiébault, S. (2016). Sea level rise and its impacts on the Mediterranean. In ‘The Mediterranean Region under Climate Change. A Scientific Update’. pp. 265–275. (IRD Éditions, Marseille, France.)
Morris, J. T., Sundareshwar, P. V., Nietch, C. T., Kjerfve, B., and Cahoon, D. R. (2002). Responses of coastal wetlands to rising sea level. Ecology 83, 2869–2877.
| Responses of coastal wetlands to rising sea level.Crossref | GoogleScholarGoogle Scholar |
Nicholls, R. J., Wong, P. P., Burkett, V. R., Codignotto, J. O., Hay, J. E., McLean, R. F., Ragoonaden, S., and Woodroffe, C. D. (2007). Coastal systems and low-lying areas. In ‘Climatic Change 2007: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change’. (Eds M. L. Parry, O. F. Canziani, J. P. Palutikof, P. J. van der Linden, and C. E. Hanson.) pp. 315–356. (Cambridge University Press: Cambridge, UK.)
Oppenheimer, M., Glavovic, B. C., Hinkel, J., van de Wal, R., Magnan, A. K., Abd-Elgawad, A., Cai, R., Cifuentes-Jara, M., DeConto, R. M., Ghosh, T., Hay, J., Isla, F., Marzeion, B., Meyssignac, B., and Sebesvari, Z. (2019). Sea level rise and implications for low-lying islands, coasts and communities. In ‘IPCC Special Report on the Ocean and Cryosphere in a Changing Climate’. (Eds H.-O. Pörtner, D. C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N. M. Weyer.) (IPCC.) Available at https://www.ipcc.ch/srocc/chapter/chapter-4-sea-level-rise-and-implications-for-low-lying-islands-coasts-and-communities/
Paskoff, R. P. (2004). Potential implications of sea-level rise for France. Journal of Coastal Research 20, 424–434.
| Potential implications of sea-level rise for France.Crossref | GoogleScholarGoogle Scholar |
Petkovšek, G., Roca, M., and Kitamura, Y. (2020). Sediment flushing from reservoirs: a review. Dams & Reservoirs 30, 12–21.
| Sediment flushing from reservoirs: a review.Crossref | GoogleScholarGoogle Scholar |
Pont, D., Simonnet, J. P., and Walter, A. V. (2002). Medium-term changes in suspended sediment delivery to the ocean: consequences of catchment heterogeneity and river management (Rhône River, France). Estuarine, Coastal and Shelf Science 54, 1–18.
| Medium-term changes in suspended sediment delivery to the ocean: consequences of catchment heterogeneity and river management (Rhône River, France).Crossref | GoogleScholarGoogle Scholar |
Prado, P., Caiola, N., and Ibáñez, C. (2013). Spatio-temporal patterns of submerged macrophytes in three hydrologically altered Mediterranean coastal lagoons. Estuaries and Coasts 36, 414–429.
| Spatio-temporal patterns of submerged macrophytes in three hydrologically altered Mediterranean coastal lagoons.Crossref | GoogleScholarGoogle Scholar |
Prado, P., Vergara, C., Caiola, N., and Ibáñez, C. (2014). Influence of salinity regime on the food-web structure and feeding ecology of fish species from Mediterranean coastal lagoons. Estuarine, Coastal and Shelf Science 139, 1–10.
| Influence of salinity regime on the food-web structure and feeding ecology of fish species from Mediterranean coastal lagoons.Crossref | GoogleScholarGoogle Scholar |
Prado, P., Roque, A., Pérez, J., Ibáñez, C., Alcaraz, C., Casals, F., and Caiola, N. (2016). Warming and acidification-mediated resilience to bacterial infection determine mortality of early Ostrea edulis life stages. Marine Ecology Progress Series 545, 189–202.
| Warming and acidification-mediated resilience to bacterial infection determine mortality of early Ostrea edulis life stages.Crossref | GoogleScholarGoogle Scholar |
Prado, P., Alcaraz, C., Benito, X., Caiola, N., and Ibáñez, C. (2019). Pristine vs. human-altered Ebro Delta habitats display contrasting resilience to RSLR. The Science of the Total Environment 655, 1376–1386.
| Pristine vs. human-altered Ebro Delta habitats display contrasting resilience to RSLR.Crossref | GoogleScholarGoogle Scholar | 30577129PubMed |
Ramírez-Cuesta, J. M., Rodríguez-Santalla, I., Gracia, F. J., Sánchez-García, M. J., and Barrio-Parra, F. (2016). Application of change detection techniques in geomorphological evolution of coastal areas. Example: mouth of the River Ebro (period 1957–2013). Applied Geography 75, 12–27.
| Application of change detection techniques in geomorphological evolution of coastal areas. Example: mouth of the River Ebro (period 1957–2013).Crossref | GoogleScholarGoogle Scholar |
Rodríguez-Climent, S., Caiola, N., and Ibáñez, C. (2013). Salinity as the main factor structuring small-bodied fish assemblages in hydrologically altered Mediterranean coastal lagoons. Scientia Marina 77, 37–45.
| Salinity as the main factor structuring small-bodied fish assemblages in hydrologically altered Mediterranean coastal lagoons.Crossref | GoogleScholarGoogle Scholar |
Rovira, A., and Ibàñez, C. (2007). Sediment management options for the lower Ebro River and its delta. Journal of Soils and Sediments 7, 285–295.
| Sediment management options for the lower Ebro River and its delta.Crossref | GoogleScholarGoogle Scholar |
Rovira, A., Ibáñez, C., and Martín-Vide, J. P. (2015). Suspended sediment load at the lowermost Ebro River (Catalonia, Spain). Quaternary International 388, 188–198.
| Suspended sediment load at the lowermost Ebro River (Catalonia, Spain).Crossref | GoogleScholarGoogle Scholar |
Sánchez-Arcilla, A., Jiménez, J. A., Valdemoro, H. I., and Gracia, V. (2008). Implications of climatic change on Spanish Mediterranean low-lying coasts: the Ebro Delta case. Journal of Coastal Research 24, 306–316.
| Implications of climatic change on Spanish Mediterranean low-lying coasts: the Ebro Delta case.Crossref | GoogleScholarGoogle Scholar |
Sayol, J. M., and Marcos, M. (2018). Assessing flood risk under sea level rise and extreme sea levels scenarios: application to the Ebro Delta (Spain). Journal of Geophysical Research – D. Oceans 123, 794–811.
| Assessing flood risk under sea level rise and extreme sea levels scenarios: application to the Ebro Delta (Spain).Crossref | GoogleScholarGoogle Scholar |
Scavia, D., Field, J. C., Boesch, D. F., Buddemeier, R. W., Burkett, V., Cayan, D. R., Fogarty, M., Harwell, M. A., Howarth, R. W., Mason, C., Reed, D. J., Royer, T. C., Sallenger, A. H., and Titus, J. G. (2002). Climate change impacts on US coastal and marine ecosystems. Estuaries 25, 149–164.
| Climate change impacts on US coastal and marine ecosystems.Crossref | GoogleScholarGoogle Scholar |
Shalby, A., Elshemy, M., and Zeidan, B. A. (2021). Modeling of climate change impacts on Lake Burullus, coastal lagoon (Egypt). International Journal of Sediment Research 36, 756–769.
| Modeling of climate change impacts on Lake Burullus, coastal lagoon (Egypt).Crossref | GoogleScholarGoogle Scholar |
Simas, T., Nunes, J. P., and Ferreira, J. G. (2001). Effects of global climate change on coastal salt marshes. Ecological Modelling 139, 1–15.
| Effects of global climate change on coastal salt marshes.Crossref | GoogleScholarGoogle Scholar |
Skoulikaris, C., Makris, C., Katirtzidou, M., Baltikas, V., and Krestenitis, Y. (2021). Assessing the vulnerability of a deltaic environment due to climate change impact on surface and coastal waters: the case of Nestos River (Greece). Environmental Modeling and Assessment 26, 459–486.
| Assessing the vulnerability of a deltaic environment due to climate change impact on surface and coastal waters: the case of Nestos River (Greece).Crossref | GoogleScholarGoogle Scholar |
Somoza, L., and Rodríguez-Santalla, I. (2014). Geology and geomorphological evolution of the Ebro River Delta. In ‘Landscapes and Landforms of Spain’. pp. 213–227. (Springer: Dordrecht, Netherlands.)
Stevenson, J. C., Ward, L. G., and Kearney, M. S. (1986). Vertical accretion in marshes with varying rates of sea level rise. In ‘Estuarine Variability’. pp. 241–259. (Academic Press.)