Sub-Bottom Profiling to Delineate Areas of Contaminated Sediments

Category:

Geotechnical Evaluation Methods

Description:

Pelagos Corporation has developed a process to improve the efficiency of bottom sampling.

Seismic sub-bottom profiling is performed to determine locations of core samples. This reduces

the number of samples required. The system can also be used to determine dredgeability.

Port of Oakland Inner and Outer Harbors were surveyed using DGPS for NOV POS, A Raytheon

DE 719 Echo Sounder for bathymetry and a sub-bottom profiling system consisting of:

1. Energy source/receiver O.R.E. (1-12 kHz).

2. Analog recorder - EPC 3200 s.

3. Digital recorder/processor - ELICS Delphi.

System proved to be very effective in delineating a wide range of disturbed sediment deposits,

which were shown by core sampling and testing to contain various amounts of contamination.

When combined with normal sediment sampling and testing using compatible navigation

accuracy, this technique provides a more accurate delineation of contaminated areas.

Reviewer:

C. Woolley

Company / Organization(s):

Projects Completed:

Oakland Outer and Inner Harbors

Location:

Oakland, California

Completion Date:

August & September 1993

Panama, Great Lakes Dredge & Dock

San Diego Bay, U.S. Navy

Information Sources:

Literature:

Month:

May

Year:

1994

LitType:

Report/Proceedings

Publisher:

WEDA XV

Page:

Chapter 5 Other Technologies Reviewed