RFG 2018 Conference

erosion

Contributions of shore erosion and resuspension to nearshore turbidity in the Choptank River, Maryland

This work contributed to the Chesapeake 2000 agreement’s commitment to reduce Chesapeake Bay sediment loads to support the aquatic living resources of the Bay and its tributaries and to remove these waters from the list of impaired waters under the Clean Water Act by 2010 (http://www.chesapeakebay.net/content/publications/cbp_12081.pdf). The study provides a basis for setting achievable sediment reduction goals under the Clean Water Act through increasing the understanding of sediment loads attributable to shore erosion.

Deer Island and Marsh Point Erosion - 50 year extrapolations

The theoretical shoreline configurations (Figures 1 and 2) are based on historic data, and should be treated as one of many likely scenarios, depending on future conditions. It should not be used to design structures; it is primarily intended to outline the potential magnitude of shoreline change. This being said, the modeled outcome appears to be in line with the present evolution of each area.

Deer Island-1993 to 1999

Deer Island, located in eastern Harrison County, Mississippi, is a privately held island and the closest of the Mississippi Islands to the mainland. It is a remnant Holocene beach ridge segment with a core of Gulfport sands (Otvos, 1985). The island has a stable history; unlike the islands located to its south, it is not dominated by migration. Of more concern is erosion, as there is no local (or updrift) source of sand to replenish what is lost during storm events. The southern shore of Deer Island is fronted by a large shallow sand sheet, which acts to buffer the island. This sand sheet is probably a result of island erosion through time and is underlain largely by Gulfport sands. The following data is being presented as an update on shoreline trends in the past 6 years, including the passage of Hurricane Georges.

Belle Fontaine, Jackson County, Mississippi: Human History, Geology, and Shoreline Erosion

The Belle Fontaine area is located on the gulf coast in Jackson County, Mississippi, between the towns of Ocean Springs and Gautier(see Figure 1). On a Mississippi main land shoreline that is over 56% altered by seawalls, artificial beaches, harbors, and other development, the beach at Belle Fontaine is one of the few natural scenic areas on the Mississippi coast, and the only remaining natural beach on the Mississippi mainland. Since the mid-1850s, when the first reliable coastal maps were made by the U. S. Coast Survey, the Belle Fontaine area has shown a steady trend of erosion along the shoreline. Over the 136-year period from the 1850s to 1986 the area has lost 473 acres due to erosion of the shoreline. Since the first settlement at Belle Fontaine in the late 1600s the area has been developed into several communities with numerous home sites located along the shoreline. Continued erosion now threatens many of these homes with destruction.

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