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Number: 3027
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by Blanchette, J.S., and Lassetter, W.L., 2019, 24 p. plus Appendices.
DGMR geoscientists analyzed 201 line-km (109 line-nm) of reconnaissance-scale seismic survey data, lithologic logs and grain size analytical data for samples taken from 15 vibracores in two study areas to assess the quality, thickness, and extent of sand deposits that could be used for beach restoration. Lithologic logs from the vibracores were used to correlate reflectors identified in the seismic sub-bottom data and to map the distribution and thickness of sand deposits. This analysis enabled volumetric calculations of the potential sand resources in areas containing a minimum sand thickness of 5 feet, and areas with a minimum sand thickness of 10 feet.
Beach-quality sand occurs in Holocene-age sand shoals, sheets, and paleo-channel infill
deposits above fluvial and estuarine sediments of Pleistocene and Pliocene age in the two assessed areas. In the Sandbridge area, we estimate about 333 million cubic yards of fine to medium grained sand with a minimum thickness of 5 feet, and 271 million cubic yards with a minimum thickness of 10 feet. The mean grain size is 0.32 mm (ɸM=1.68). To the north in the Wallops area, we estimate about 421 million cubic yards of fine grained sand with a minimum thickness of 5 feet, and 393 million cubic yards of sand with a minimum thickness of 10 feet. The mean grain size is 0.21 mm (ɸM=2.44). The preliminary volumetric estimates will require additional infill data collection and analysis to confirm viable resources.
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