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Increased High Tide Flooding Threatens Coastal Security in the US


Soldiers with the Texas Army National Guard move floodwaters from Hurricane Harvey (U.S. Army photo by 1st Lt. Zachary West)

By Dr. Marc Kodack

The National Oceanic and Atmospheric Administration recently published its latest outlook for high tide flooding in the United States, which covers the period May 2020-to-April 2021. According to the report, the increases in coastal flooding described in last year’s report will continue with even greater frequency as sea levels rise. U.S. Department of Defense coastal installations will continue to be affected, such as those in San Diego and Norfolk. High tide flooding is non-linearly accelerating along the east and Gulf coasts, whereas it is linearly increasing elsewhere. For all these coastal locations the extent and frequency of high tide flooding is projected to continue to increase over the coming decades. (more…)

New Briefer: Coastal Megacities vs. the Sea

lagos_nigeria_6352734402BRIEFER: Coastal Megacities vs. the Sea: Climate and Security in Urban Spaces
Janani Vivekananda (adelphi) & Neil Bhatiya (The Center for Climate and Security)

Cities are on the sharp end of a range of risks from criminal violence, terrorism and war to demographic pressures, to climate and environmental change. Coastal megacities are especially at risk given the specific impacts of climate change they face, including accelerated global sea-level rise, increased storm frequency and severity, and destruction to critical infrastructure such as port facilities, rail and road linkages, and energy installations, all of which are amplified as urban populations become ever larger. All these risks can lead to the loss of livelihoods as well as significant loss of life itself. Furthermore, the interaction of these risks could exceed the existing coping capacity of communities and governments and contribute to an increase in insecurity and possibly violent conflict. Read more.

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