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- W1531983002 abstract "ABSTRACT Coastal Louisiana is surfaced with a wedge of Recent sediment, most of which can be classified as deltaic or marginal deltaic deposits of the Mississippi River. The eastern two-thirds of the state has an extremely irregular shoreline, reflecting the minor physiographic relief of deltaic features, such as natural levees, interlevee basins, etc., modified by subsidence, wave erosion and sedimentation. This eastern segment of coastal Louisiana resulted from several diversions of the river and consequent deposition during the last several thousand years. Older deltaic masses have had more time for compaction, subsidence and wave modification than have those more recently abandoned. Therefore, rates of coastal change on older delta fronts are slower than they are on younger delta fronts. By the use of over 100 different, accurate, ground and aerial surveys, made during the period 1838 through 1954, it has been possible to determine rates of erosion and/or deposition for the entire Louisiana shoreline. From these calculated rates, it is possible, by extrapolation, to determine the position and configuration of the shoreline prior to the time of accurate and detailed mapping. By this cartographic technique, a shoreline has been reconstructed for the year 1812, at which time Louisiana became a member of the Union. The reconstructed shoreline map emphasizes the fact that although there has been appreciable deposition and seaward growth at the mouth of the Mississippi River, the remainder of the shoreline has been predominately subjected to erosion and resultant retreat. Major retreat has occurred on recently abandoned delta fronts in comparison with minor retreat rates for older deltaic units and the marginal deltaic region in western coastal Louisiana." @default.
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- W1531983002 date "1957-01-01" @default.
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- W1531983002 title "Changes in the Louisiana Shoreline" @default.
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