Mangroves for Coastal Defence: Guidelines for coastal managers & policy makers

Originally published



The role of mangroves in protecting our coasts against natural hazards such as storms, tsunamis and coastal erosion has been widely acknowledged. Even so, the level of protection provided by mangroves remains subject to debate. Numerous mangrove restoration projects were instigated after the 2004 East Asian tsunami in the belief that replacing lost mangroves would reduce future risk, but others raised concerns that not all of these projects were well conceived, and that some might create greater risks by inducing a false sense of security. Can mangroves reduce waves literature exists describing many of these processes, but careful scrutiny is needed to determine what is known or unknown, and what remains uncertain.

The Nature Conservancy and Wetlands International together with the University of Cambridge set out to map the current state of knowledge about the role of mangroves in coastal defence three technical reports that describe the extent to which mangroves reduce wind and swell waves, storm surges and erosion and how they build up soils in response to rising sea levels. The conclusion is that mangroves can indeed reduce risk from a large number of hazards.

This practical guidebook summarizes the findings of the reviews and provides practical management recommendations to coastal zone managers and policymakers. It helps the reader interventions and to incorporate these in risk reduction strategies, climate change adaptation protocols and broader coastal development planning. Case studies provide practical examples of mangrove management approaches and references to background information, practical tools for risk assessment and mangrove management are provided throughout the book. restoration