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

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.

Top of Page | Back to 3D Color Perspectives

For more information, please contact:
Michael E. Torresan

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