Coastal systems are exposed to natural hazards such as tropical storms, as well as slower process such as coastal erosion. Sea level rise exacerbates the effects of these hazards and the rate of sea level rise is expected to increase in the future. The return period is the probability that an event of a certain magnitude will be equaled or exceeded within a certain period of time; extreme events are more likely to occur in the future due to climate change. Consequences of these events will also depend on socioeconomic development in the region, and managing risk is essential when planning the future of coastal zones. Adaptation is classified into hard and soft protection, accommodation, and retreats.
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