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Coastal adaptation How can coastal communities adapt to sea-level rise?

Follow relative sea level, recurring floods, wetlands, living shorelines, accommodation, protection, retreat, equity, and adaptive monitoring.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Sea level is relative to the landExplain how relative sea level and recurring floods shape coastal risk.Local water levels depend on ocean change, land motion, tides, and storms.
Nature can buffer waterCompare nature-based shoreline adaptation with the conditions it needs to work.Wetlands and living shorelines reduce some hazards when space, sediment, and water exchange remain available.
Communities can accommodate waterIdentify practical ways to keep buildings and essential services functioning as water levels rise.Accommodation reduces damage, but infrastructure networks and service continuity matter.
Protection has limitsEvaluate protection and retreat as choices with physical, social, and financial tradeoffs.Walls, barriers, and retreat can reduce risk while shifting costs, access, or habitat impacts.
Adaptation is a pathwayUse scenarios, thresholds, and monitoring to make adaptation revisable.Good plans link evidence to triggers, review dates, and fair adjustment.

Questions this course answers

Why does land motion matter for coastal planning?

Relative sea level combines ocean change with movement of the land beneath a community.

What can recurring high-tide floods reveal?

Higher baseline water makes flooding more frequent even without an extreme storm.

What does a wetland need to keep pace with rising water?

Wetland elevation can build when plants, sediment, and water movement remain connected.

Why is a living shoreline site-specific?

Design must match local physical conditions and ecological communities.

What is accommodation?

Accommodation adapts buildings and services to function through manageable flooding.

Why should planners study infrastructure networks?

Services depend on connected routes, power, water, and facilities.

Grounded in trusted sources

IPCC, Climate Change 2022: Impacts, Adaptation and Vulnerability, Chapter 3 Oceans and Coastal Ecosystems and Their Services, https://www.ipcc.ch/report/ar6/wg2/chapter/chapter-3/
NOAA, 2022 Sea Level Rise Technical Report Application Guide, https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report.html
U.S. Geological Survey, Sea-Level Rise Hazards and Decision Support, https://www.usgs.gov/centers/whcmsc/science/sea-level-rise-hazards-and-decision-support
NOAA National Centers for Coastal Ocean Science, The Effects of Sea Level Rise Program, https://coastalscience.noaa.gov/science-areas/climate-change/ecological-effects-sea-level-rise-program/
NOAA Ocean Service, What is resilience?, https://oceanservice.noaa.gov/facts/resilience.html

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