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SHOREFACE PROCESSES IN ONSLOW BAYFigure 3. Sidescan-sonar image of the Wrightsville Beach shoreface and inner shelf obtained in March 1994, showing locations ofseveral shore-normal to shore-oblique rippled scour depressions (RSDs), as well as features shown in Figure 4A-C. Areas of highacoustic backscatter are shown as light to white colored (generally medium sand and coarse, including rock outcrops); low acousticbackscatter is dark to black (finer than medium sand, and mud).23
E. Robert ThielerFigure 4. Enlarged view of features identified in Figure 3. A) A mud-filled channel outcropping on the inner shelf is shown here asa band of low backscatter (dark) sediment bounded by areas of slightly higher backscatter. This is a mid-Holocene tidal creek beingexhumed by shoreface erosion. B) The rippled scour depressions on the shoreface and inner shelf typically have a sharp contactbetween coarse (high backscatter- white) and fine (low backscatter-dark) sediment. The southern contacts, however, appear more“feathered” or “wispy.” C) Low-relief limestone outcrops in the study area is characterized by a somewhat diffuse pattern of highbackscatter on the sidescan image. Rock scarps, however, are identifiable as curvilinear narrow bands of high acoustic backscatter.Several are identifiable in the southeastern portion of Figure 3.24
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Page 50 and 51: William J. ClearyFigure 9. Shorelin
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Page 56 and 57: Lynn A. LeonardFigure 2. Stratigrap
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Appendix 2. Post Hurricane Bertha (
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Appendix 4. Post Hurricane Bertha.
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Appendix 6. Post Hurricane Fran (9/
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Appendix 8. Post Hurricane Fran (9/
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