Development and evaluation of the offshore and coastal dispersion model

Journal Article · Tue Oct 01 00:00:00 EDT 1985 · J. Air Pollut. Control Assoc.; (United States)

DOI:https://doi.org/10.1080/00022470.1985.10466003· OSTI ID:5968284

Hanna, S R; Schulman, L L; Paine, R J; Pleim, J E; Baer, M

The Offshore and Coastal Dispersion (OCD) model has been developed for the Minerals Management Service (MMS) to determine the impact of offshore and onshore emissions from point sources on the air quality of coastal regions. Constructed on the framework of the EPA guideline model MPTER, the OCD model incorporates overwater plume transport and dispersion as well as changes that occur as the plume crosses the shoreline. Hourly meteorological data are needed from both offshore and onshore locations, including wind direction and speed, mixing height, overwater air temperature and relative humidity, and the sea surface temperature. Observed turbulence intensities are preferred by the model but are not mandatory. Dispersion coefficients are proportional to turbulence intensities. A virtual source technique is used to change the rate of plume growth as the overwater plume intercepts the overland internal boundary layer. The continuous shoreline fumigation case is treated using an approach suggested by Deardorff and Willis. Calculation of plume reflection from elevated terrain follows the Rough Terrain Dispersion Model (RTDM). The OCD model and the modified EPA model used as an interim model for overwater applications by the MMS were tested with measurements from three offshore tracer experiments. The OCD model was shown to be a clear improvement over the EPA model and was officially approved by the MMS in March 1985.

• Research Organization: Environmental Research and Technology, Inc., Concord, MA
• OSTI ID: 5968284
• Journal Information: J. Air Pollut. Control Assoc.; (United States), Vol. 35:10
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR QUALITY
MATHEMATICAL MODELS
LONG-RANGE TRANSPORT
AIR POLLUTION
COASTAL REGIONS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DESIGN
PLUMES
US EPA
ENVIRONMENTAL QUALITY
ENVIRONMENTAL TRANSPORT
MASS TRANSFER
NATIONAL ORGANIZATIONS
POLLUTION
SIMULATION
US ORGANIZATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)