Mongabay
August 31, 2021
Hurricane Ida hit New Orleans and surrounding areas in the U.S. state of Louisiana this past Sunday, serving as a grim reminder of the power of coastal storms — which are predicted to increase as the climate crisis rolls onward.
Scientists and engineers have known for some time that wetlands (such as dense mangroves, tree-studded swamps, and grass-covered marshes) protect exposed coastlines and coastal cities from storms. But for places like London, Tokyo, New York and 19 of the world’s largest cities built around estuaries — the wave-sheltered places where freshwater meets the sea — wetlands may be their silent superman.
Wetlands can reduce flood levels from storms by up to 2 meters (6 feet) and avoid $38 million in flooding damages per estuary, according to a new study published in the journal Environmental Research Letters.