Sidescan-Sonar Imagery of the Shoreface and Inner Continental Shelf, Wrightsville Beach, North Carolina

Results and Interpretations
  • Rippled Scour Depressions
  • Submarine Hardbottoms
  • Inner Shelf Dunes
  • Exposed Quaternary Channel Fill
  • Bathymetry


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    Fig. 11, Cross-section (A-A') of an inner shelf crescentic dune, with accompanying sidescan sonar imagery and interpretation of cores penetrating the inner shelf dune above
    Figure 11. Click for
    larger image with caption    .
    Inner Shelf Dunes:Four coarse-grained, crescentic, dune-like features that are several hundred meters long along-crest, 100-200 meters wide, with crest directions near 075 degrees (see Figure 4) are present on the inner shelf. As shown in Figure 11 (at right), the dunes are composed primarily of residual sediments derived from bioerosion and physical weathering of marine hardbottoms on the inner shelf.




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    Based on E. Robert Thieler, William C. Schwab, Mead A. Allison, Jane F. Denny, and William W. Danforth, Sidescan-Sonar Imagery of the Shoreface and Inner Continental Shelf, Wrightsville Beach, North Carolina: U.S. Geological Survey Open-file Report OF 98-616.
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    Web page: Donna Newman
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