USGS Western Coastal and Marine Geology
Pacific Coastal & Marine Science Center

Fate of Dredge Disposal Material and Polluted Sediment, Offshore Honolulu, Hawaii

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3D Color Perspective Overview Of The South Oahu Margin Between Ewa And Diamond Head

The submerged reef terrace (A) at 60 to 100 m depth is the dominant feature of the insular shelf edge. High backscatter patterns (reddish-brown) indicate rock exposures at (B), and patches of coarse dredge material at (C). Dredged material is a poorly sorted deposit of sand, gravel, and larger clasts of limestone and reef material bound by a cohesive matrix of grey mud. Dredge material is strongly contrast by the natural, light-colored muddy sand. The scale across the bottom of the image is appx. 12.5 km. The vertical exaggeration is 5x.

Central Mamala Bay

 

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For more information, please contact:
Michael E. Torresan

U.S. Geological Survey
345 Middlefield Road MS 999
Menlo Park, CA 94025



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U.S. Department of the Interior | U.S. Geological Survey | Western Coastal & Marine Geology
URL: http://walrus.wr.usgs.gov/mamalabay/3Dcolorperspectives/mamalabay1.html
Maintained by Laura Zink Torresan
Last modified 11 October 2005 (lzt)