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Coastal Flood Hazards: Warning & Mitigation

Learn about the IOC perspective on coastal flood hazards, early warning systems, and mitigation strategies for tsunamis, storm surges, and extreme waves. Explore the importance of detection, assessment, and preparedness to reduce risk. Discover how regional and national warning centers work together in an end-to-end multi-hazard warning system.

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Coastal Flood Hazards: Warning & Mitigation

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  1. Coastal flood hazards –warning, preparedness and mitigationThe IOC perspective Presented by Russell Arthurton Coastal Geoscience, UK r.arthurton@talktalk.net

  2. Responding to a mandate from its Member States following the Indian Ocean tsunami of 26 December 2004, the Intergovernmental Oceanographic Commission (IOC) of UNESCO has approved implementation plans: to establish operational systems for detecting and advising on marine physical hazards which could lead to coastal flooding – tsunamis, storm surges and extreme wind-forced waves, and to advise its MS on methodologies for coastal flood management within ICAM/ICZM through marine hazard risk assessment, mitigation and adaptation The IOC-coordinated marine multi-hazard warning systems

  3. The Northeast Atlantic, Mediterranean and Connected Seas Warning System (NEAMTWS) in its global context • Since 1965 – successful operation of PTWS • From June 2005 three more regional systems to coordinate

  4. Mediterranean tsunami propagation N Algeria source + 30 min Hellenic Arc source + 30 min

  5. North Sea storm- or tidal surges

  6. North Sea tidal surge propagation In UK – Storm Tide Forecasting Service run by the Environment Agency – 5-stage forecasting sequence from 48 hrs before astronomical high water http://www.metoffice.gov.uk/education/secondary/students/flood.html#warnings

  7. Seismographic detection, real-time sea-level monitoring and meteorological networks feeding data toRegional Watch Centres Regional Watch Centres– processing received data and issuing hazard watch information toNational Warning Centres National Warning Centres– processing received watch information and issuing hazard warnings to selected local authorities for relay tocoastal communities Detection, watch and warning – an end-to-end multi-hazard early warning system

  8. Quantifying the marine hazard Type, magnitude, frequency of incidence Assessing exposure to the hazard Pathways for hazard impact – bathymetry, coastal topography, existing defences Assessing receptor vulnerability Social, economic, ecological, institutional Facilitating an understanding of coastal flood risk

  9. Coping and resilience Public awareness and emergency preparedness – SOPs, warning systems and evacuation plans in place Mitigation Structural actions aimed at reducing exposure to the hazard Adaptation Non-structural actions including rehabilitation, land-use planning and implementation, building codes Managing coastal flood risk within an ICAM/ICZM framework

  10. Standardizing watch information Confirmations, updates, “all-clears” Promoting standard warning nomenclature Levels of warning, thresholds for emergency action Promoting communications synergy Integrated, compatible early warning and emergency communications networks Transmission of warnings to end-user Watches, warnings and communication of hazards

  11. Effective in risk reduction Compatible with Regional aims/directives Synergetic with other warning systems Taking account of research developments Affordable Sustainable Credible – appropriate to the risk Responsive to changing conditions Production of global “Guidelines for Mainstreaming Awareness and Mitigation of Marine-related Hazards and Risks within ICAM/ICZM” Key objectives of the IOC marine multi-hazard warning system

  12. Lisbon earthquake and tsunami 1755http://www.oceansatlas.org/unatlas/-ATLAS-/IMAGES/HIGH/i232-1.jpg

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