Field Measurements and Modeling of Dilution in the Wake of a US Navy Frigate
SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
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A field measurement and computer modeling effort was made to assess the dilution field of pulped waste materials discharged into the wake of a US Navy frigate. Pulped paper and fluorescein dye were discharged from the frigates pulper at known rates The subsequent particle and dye concentration field was then measured throughout the wake by a following vessel using multiple independent measures. Minimum dilution of the pulped paper reached 3.2 x 10 within 1900 m behind the frigate, or about 8 min after discharge. Independent measures typically agreed within 25 of one another and within 20 of model predictions. Minimum dilution of dye reached 2.3 x lO at a down-wake distance of approximately 3500 m, or roughly 15 min. Comparison to model measurements were again within 20. The field test was not only successful at characterizing wake dilution under one set of at-sea conditions, but was successful at validating the computer model used for assessing a wide range of ships and conditions.
- Fluid Mechanics
- Water Pollution and Control