channel shallowing as mitigation of coastal flooding

Clicks: 335
ID: 167736
2015
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Abstract
Here, we demonstrate that reductions in the depth of inlets or estuary channels can be used to reduce or prevent coastal flooding. A validated hydrodynamic model of Jamaica Bay, New York City (NYC), is used to test nature-based adaptation measures in ameliorating flooding for NYC's two largest historical coastal flood events. In addition to control runs with modern bathymetry, three altered landscape scenarios are tested: (1) increasing the area of wetlands to their 1879 footprint and bathymetry, but leaving deep shipping channels unaltered; (2) shallowing all areas deeper than 2 m in the bay to be 2 m below Mean Low Water; (3) shallowing only the narrowest part of the inlet to the bay. These three scenarios are deliberately extreme and designed to evaluate the leverage each approach exerts on water levels. They result in peak water level reductions of 0.3%, 15%, and 6.8% for Hurricane Sandy, and 2.4%, 46% and 30% for the Category-3 hurricane of 1821, respectively (bay-wide averages). These results suggest that shallowing can provide greater flood protection than wetland restoration, and it is particularly effective at reducing "fast-pulse" storm surges that rise and fall quickly over several hours, like that of the 1821 storm. Nonetheless, the goal of flood mitigation must be weighed against economic, navigation, and ecological needs, and practical concerns such as the availability of sediment.
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orton2015journalchannel Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Philip M. Orton;Stefan A. Talke;David A. Jay;Larry Yin;Alan F. Blumberg;Nickitas Georgas;Haihong Zhao;Hugh J. Roberts;Kytt MacManus
Journal archaeologies
Year 2015
DOI
10.3390/jmse3030654
URL
http://www.mdpi.com/2077-1312/3/3/654
Keywords
adaptation wetlands hurricane sandy flooding hurricane storm surge bathymetry tides new york citynaval architecture

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