Skip USGS links group
USGS - science for a changing world
NOAA logo with link to NOAA home page

Woods Hole Science Center

End of USGS links group

Surficial Geology in Central Narragansett Bay, Rhode Island: Interpretations of Sidescan Sonar and Multibeam Bathymetry


List of Figures

Skip past contents information
List of Figures
Figure 1. Map of Narragansett Bay with study areas. Figure 1. Map of Narragansett Bay with study areas shown in red. Rectangles in study areas show the locations of figure 4 (in East Passage), figure 7 (southern rectangle in West Passage), and figure 8 (northern rectangle in West Passage).
Figure 2. Photo of NOAA Ship RUDE (taken by NOAA). Figure 2. Photo of NOAA Ship RUDE (taken by NOAA).
Figure 3.  Bathymetry map of study areas. Depth is in meters and represents mean lower low water. Figure 3. Bathymetry map of study areas. Depth is in meters and represents mean lower low water.
Figure 4. Image of sidescan sonar image of mottled backscatter, pockmarks, a rock, and bathymetry image of area showing irregular bottom.  Figure 4. A. Sidescan sonar image of mottled backscatter, pockmarks, and a rock. B. Bathymetry image of the same area showing irregular bottom corresponding to mottled backscatter and scour to the southwest of the rock. Location of area shown in figure 1.
Figure 5.   Sidescan sonar image of study areas. Figure 5. Sidescan sonar image of study areas. Dark tones indicate low backscatter and generally finer grained sediment; light tones indicate high backscatter and generally coarser grained sediment. Tonal changes are generally gradual, although abrupt changes occur in areas, such as the northern edge of the West Passage study area, due to artifacts of the processing.
Figure 6. Interpretation map of sidescan sonar and bathymetry data. Figure 6. Interpretation map of sidescan sonar and bathymetry data.
Sidescan sonar image of circular depressions (pockmarks) and bathymetry image of same area. Figure 7. A. Sidescan sonar image of circular depressions (pockmarks) B. Bathymetry image of same area. Location of area shown in figure 1.
Figure 8. Sidescan sonar image of erosional pathways in West Passage. Location of area shown in figure 1. Figure 8. Sidescan sonar image of erosional pathways in West Passage. Location of area shown in figure 1.
Figure 9. Map showing sample locations and distribution of surficial sediments. Figure 9. Map showing sample locations and distribution of surficial sediments. Map boundaries interpreted from sediment samples, backscatter, and bathymetry data.
Figure 10. Map showing distribution of sedimentary environments.  Figure 10. Map showing distribution of sedimentary environments. Interpretation of map units is based on backscatter, bathymetry and sediment sample data.
Skip Navigation

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USAGov logo U.S. Department of the Interior | U.S. Geological Survey

URL: woodshole.er.usgs.gov/pubs/of2006-1199/html/figures.html
Page Contact Information: WHSC Webmaster
This page last modified on Tuesday, 18-Sep-2007 10:32:53 EDT