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Technology
Assessment & Research (TA&R) Program
| Project Number |
477 |
| Date of Summary |
January 27, 2006 |
| Subject |
Correlating Results of
Dispersants Effectiveness at Ohmsett with Identical At-Sea trial: Effects of
Oil Viscosity and Dispersant to Oil Ratios |
| Performing Activity |
S.L. Ross Environmental Research, Ltd. |
| Principal Investigator |
Dr. Ken Trudel |
| Contracting Agency |
Minerals Management Service |
| Estimated Completion |
Completed |
| Description |
The objectives of this research project are
twofold. The first is to determine if the results of dispersant
effectiveness tests conducted at Ohmsett are consistent with those gathered
in the laboratory and under actual at-sea conditions. The project will
conduct a series of dispersant effectiveness tests at Ohmsett under
identical conditions to those conducted in the at-sea trials done in the UK
in 2003. The research will compare the threshold limiting conditions for
dispersibility as measured at Ohmsett with those measured in the laboratory
and at-sea, under identical conditions. Second objective is deployment of the SMART
(Surveillance and Monitoring for Alternative Response Technology) monitoring
protocols in experiments where direct, independent, measurements of
effectiveness are made. By design, these experiments will involve highly
effective dispersants applications, as well as moderately effective,
slightly effective, and ineffective applications. Our objectives will be to:
a) correlate the monitoring results with the measured levels of
effectiveness to verify the usefulness of the monitoring protocols; and b)
Determine the limitations of the protocols if any, in detecting low levels
of effectiveness. In addition, the experiments will provide a data set
that can be used in refining the protocols, if required.
The proposed work will:
- Evaluate the results of the US at-sea
trials,
- Design a dispersant program at Ohmsett based on the results of the UK trials,
- Conduct dispersant effectiveness
experiments at Ohmsett under identical conditions to those in the UK
trials,
- Correlate the results of the Ohmsett experiments with data collected during the UK at-sea trials and from
laboratory effectiveness tests,
- Write a technical report and scientific
paper on the results of this research project.
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| Progress |
UK at-sea dispersant effectiveness
experiments were successfully conducted in June 2003, offshore the Isle of
Wright, UK. MMS participated in these experiments. Results of these
experiments were used to design a dispersant effectiveness test program at Ohmsett based on the UK sea trials. Effectiveness experiments were
successfully done in October 2003 at Ohmsett facilities. Many participants
observed the experiments. Identical oils (IFO-120, 180, and 380) and
dispersants (Agma DR 379, Corexit 9500, Superdispersant 25) as well as
identical dispersant-to-oil ratios, water temperatures and salinity were
used in the tests.
In addition, the USCG Atlantic Strike Team and Oil
Spill Response Limited, Southampton, UK used the experiments as training
exercise for their dispersant monitoring protocol. Texas AM brought in new
equipment to test and monitor equipment used by the response teams. Data
from the experiment are being analyzed and draft report should be out in the
spring of 2004.
MMS has shipped the test oils and dispersants
to other agencies and companies so test can be conducted in smaller wave
tanks and laboratory scale. When these experiments are completed, there
should be a better understanding of the correlation and scale with
dispersant performance under at-sea conditions.
This project is complete. The final results
were presented at the 2005 International Oil Spill Conference. The final
report is available from the Minerals Management Service in PDF on a CD that
also contains more than 80 video clips that documents each dispersant
experiment. The film clips are not imbedded in the final report that is
downloadable in PDF format from the MMS website.
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Reports |
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AA
(1.9MB) |
“Dispersant Effectiveness Testing: Relating
Results from Ohmsett with At Sea Tests”, submitted by SL Ross Environmental
Research Ltd., Ottawa, ON, A. Lewis Oil Spill Consultancy and MAR,
Incorporated, Rockville, MD, December 2005, 91 pp. |
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