Download Drawing Louisiana's New Map: Addressing Land Loss in Coastal by National Research Council, Division on Earth and Life PDF

By National Research Council, Division on Earth and Life Studies, Ocean Studies Board, Committee on the Restoration and Protection of Coastal Louisiana

Up to now 50 years, coastal Louisiana has suffered catastrophic land loss because of either usual and human explanations. This loss has elevated hurricane vulnerability and amplified hazards to lives, estate, and economies--a truth underscored via Hurricanes Katrina and Rita. Drawing Louisiana's New Map studies a recovery plan proposed via the U.S. military Corps of Engineers and the nation of Louisiana, discovering that, even if the person tasks within the learn are scientifically sound, there will be extra and bigger scale tasks that offer a accomplished method of addressing land loss over this sort of huge region. extra importantly, the examine could be guided by means of an in depth map of the predicted destiny panorama of coastal Louisiana that's built from agreed upon objectives for the zone and the state.

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Does the phased approach outlined in the LCA Study provide an adequate basis to start developing a comprehensive coastal restoration plan to achieve the broad goals articulated by Coast 2050: Toward a Sustainable Coastal Louisiana? framed by the statement of task, the committee had to understand the challenges facing existing efforts to restore and protect coastal Louisiana as well as efforts proposed in the LCA Study. This report has benefited considerably from the many informative presentations made by individuals with substantial knowledge of the history and processes associated with the Louisiana coastal area.

In a recent analysis of deltaic systems of the world, Walsh et al. (in press) characterize the Mississippi River Delta as “proximal-deposition dominated,” meaning that the bulk of the sediments discharged by the river were deposited close to the river mouth. In recent geologic history, a series of lobate deltaic projections were followed by avulsions, or channel switches. According to Kolb and Van Lopik (1966), at least 16 such lobes were created and abandoned in late Quaternary time (the last 20,000 years).

Wetlands contribute to the removal of nutrients by plant uptake of soluble material and flow reduction, which enhances the deposition of organic and inorganic sediments. In surface layers, nitrification occurs and is followed by denitrification as the nitrates are carried to anoxic zones in sediments or in suspended sediment regions near the bottom. Phosphates are bound to sediments, and both phosphates and nitrates are taken up by plants. Wetlands also promote flow reductions, which enhance nutrient removal and the deposition of organic and inorganic sediments.

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