Siddharth Narayan, Robert J Nicholls, Ekaterina Trifonova, Mariana Filipova – Marinova, Iliyan Kotsev, Stoyan Vergiev, Susan Hanson, Derek Clarke


Coastal habitats are highly threatened ecosystems that are sensitive to complex sets of natural and human drivers. Europe’s coastal habitats are protected from damage due to human activity by the EU Habitats Directive, and are required to be mapped within flood risk assessments by the EU Floods Directive. Ecological vulnerability and risk assessments are a common way of assessing the impacts on these habitats due to human and natural drivers. Coastal flood risk assessments therefore often include assessments of the vulnerability of coastal habitats. Flood risk assessments also evaluate, where relevant, the mitigation services provided by coastal habitats. The two aspects of coastal habitats – their flood mitigation service and their ecological vulnerability are strongly correlated; however these are usually treated separately within flood risk assessments. One of the goals of the EU THESEUS project is the integrated consideration of coastal habitats within flood risk assessments. This paper investigates the integration within flood risk assessments of the two aspects of coastal habitats using the 2D SPR conceptual model. The construction of the model is first illustrated by application to a generic study site. The model is then applied to a case-study where data on habitat elevations and vulnerabilities to flood events have been collected. The model provides a unique and robust means of combining information on ecological vulnerability indices for different habitat associations with information on their distribution and spatial relationships within the coastal floodplain. Used in conjunction with information on habitat vulnerability indices, the conceptual model serves as a powerful tool for integrated and structured consideration of coastal habitats within flood risk assessments


coastal habitats; flood risk; 2D SPR; integrated assessments; Habitats Directive; Floods Directive

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Acreman M.C., Fisher J., Stratford C.J., Mould D.J. and Mountford J.O., 2007. Hydrological science and wetland restoration: some case-studies from Europe. Hydrology and Earth System Sciences, 11(1): 158-169.

Adger, W.N., Hughes, T.P., Folke, C., Carpenter, S.R. and Rockström, J., 2005. Social-ecological resilience to coastal disasters. Science, 309(5737): 1036-1039.


Airoldi, L. et al., 2005. An ecological perspective on the deployment and design of low-crested and other hard coastal defence structures. Coastal Engineering, 52(10–11): 1073-1087.

Airoldi, L. and Beck, M.W., 2007. Loss, status and trends for coastal marine habitats of Europe. In: R.N. Gibson, R.J.A. Atkinson and D.M. Gordon (Editors), Oceanography and marine biology: An annual review. CRC Press, Boca Raton, Florida, USA, pp. 345 - 405.

Alongi M.D., 2002. Present state and future of the world's mangrove forests. Environmental Conservation, 29: 331-349.

Danielsen, F. et al., 2005. The Asian tsunami: A protective role for coastal vegetation. Science, 310(5748): 643.


EC, 2004. Living with coastal erosion in Europe - sediment and space for sustainability, OPOCE, Luxembourg.

Edgar, G.J., Barrett, N.S., Graddon, D.J. and Last, P.R., 2000. The conservation significance of estuaries: A classification of tasmanian estuaries using ecological, physical and demographic attributes as a case study. Biological Conservation, 92(3): 383-397.

EEA, 2010a. 10 messages for 2010 - coastal ecosystems, EEA, Copehagen, Denmark.

EEA, 2010b. Ecosystem accounting and the cost of biodiversity losses: The case of coastal Mediterranean wetlands, EEA, Copenhagen, Denmark.

European Commission, 2007a. The Habitats Directive, Retrieved September 2012, from

European Commission, 2007b. A new Floods Directive. Retrieved September 2012, from

Evans, E. et al., 2004. Foresight future flooding: Scientific summary: Volume I - future risks and their drivers. Office of Science and Technology, London.

FLOODSite Consortium, 2009. Integrated flood risk analysis and management methodologies. Available at [Accessed: September, 2012]

Friess D.A., Spencer T., Smith G.M., Moller I., Brooks S.M. and Thomson A.G., 2012. Remote sensing of geomorphological and ecological change in response to saltmarsh managed realignment, The Wash, UK. International Journal of Applied Earth Observation and Geoinformation, 18: 57-68.

King S and Lester J.N., 1995. The value of salt-marsh as a sea defence. Marine Pollution Bulletin, 30(3): 180-189.

Lotze, H.K. et al., 2006. Depletion, degradation, and recovery potential of estuaries and coastal seas. Science, 312(5781): 1806-1809.


McFadden L., Spencer T., Nicholls R.J., 2007. Broad-scale modelling of coastal wetlands: what is required? Hydrobiologia 577: 5-15

Meyer D.L., Townsend E.C., Thayer G.W., 1997. Stabilisation and Erosion Control Value of Oyster

Cultch for Intertidal Marsh. Restoration Ecology, 5(1): 93-99.

Moller, I, 2006. Quantifying saltmarsh vegetation and its effect on wave height dissipation: Results from a UK East coast saltmarsh. Estuarine, Coastal and Shelf Science, 69: 337-351.

Narayan, S. et al., 2012. A holistic model for coastal flooding using systems diagrams and the Source -Pathway - Receptor (SPR) concept. Nat. Hazards Earth Syst. Sci, 12: 1431-1439.

Small, C. and Nicholls, R.J., 2003. A global analysis of human settlement in coastal zones.

Stancheva, M., Marinski, J., Peychev, V., Palazov, A. and Stanchev, H., 2011. Long-term coastal changes of Varna Bay caused by anthropogenic influence. Geo-Eco-Marina, 17(1): 33-40.

Suchanek, T.H., 1994. Temperate coastal marine communities: Biodiversity and threats. American Zoologist, 34(1): 100-114.

Tanaka N., Yasushi S., Mowjood M.I.M, Jinadasa K.B.S.N. and Homchuen S., 2007. Coastal vegetation structures and their function in tsunami protection: experience of the recent Indian Ocean tsunami. Landscape and Ecological Engineering, 3:33-45.

THESEUS Consortium, 2012a. A heavy storm hits the bulgarian coast. Retrieved September, 2012, from

THESEUS Consortium, 2012b. Theseus : Innovative technologies for safer European coasts in a changing climate (

Vergiev, S., Filipova-Marinova, M., Trifonova, E., Kotsev, I., Pavlov, D. The effect of sea-water immersion on viability of the psamophilous species Leymus racemosus (Lam.) Tzvel. ssp. sabulosus (Bieb.) Tzvel and Ammophila arenaria (L.) Link. Comptes rendus de l'Academie bulgarie des Sciences (In press)

Vitousek, P.M., Mooney, H.A., Lubchenco, J. and Melillo, J.M., 1997. Human domination of Earth's ecosystems. Science, 277(5325): 494-499.

Wolfe S.A. and Nickling W.G., 1993. The protective role of sparse vegetation in wind erosion. Progress in Physical Geography, 17(1): 50-68.

Woodhouse W.W., Seneca Jr. E.D., Broome S.W., 1976. Propagation and Use of Spartina Alterniflora for Shoreline Erosion Abatement. USACE Coastal Engineering Research Chapter. Technical Report