Side-scan sonar data
Location | Sonar | Sediments
Profile | Cross Section


Projection: UTM, GRS 1980, NAD83, Zone 17. Coordinates: Geographic. Bathymetry (areas > 4 m) after Gelfenbaum and Guy (1999). Coastal areas (< 4 m) represented by Digital Orthophoto Quarter Quadrangle (1995).

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Location Map
Surface Sediments
Seismic-Profile Data
Transect Cross Section
Side-scan sonar imagery overlain on bathymetry reveals a mixed pattern of bedform orientation. Offshore ridges appear to trend NW-SE. In contrast, the nearshore area associated with ebb-tidal deposits exhibits more NE-SW-oriented bedforms, including an area of shore-normal sand bars adjacent to the shoreface immediately south of Southwest Channel. Although thicker and more abundant sediment accumulation characterizes the shelf in this area, hardbottom areas are still present offshore. Low backscatter (light gray) areas correspond to sand ridges and flats dominated by quartz sand. The dark (high backscatter) areas are mainly a coarse sediment veneer containing carbonate material (primarily shell material) or hardbottoms.