The objective of this project is to quantify the mixing energy in Ohmsett's test tank during wave conditions. Mixing energy is a key parameter in dispersant effectiveness tests and is quantified in small and intermediate scale tests by such methods as the EPA baffled flask test. To collect data that will help correlate dispersant effectiveness tests conducted at small scale with those conducted at Ohmsett, NRL will tow a MicroRider turbulence sampling package in Ohmsett's test tank at different depths and wave conditions. NRL will also use wave height sonic probes mounted above the surface of the tank, and a set of sensing packages on the bottom of the tank, to characterize the background flow field in the tank, including wave particle velocities, large-scale turbulent motions and aeration associated with wave breaking conditions. The velocity-shear data recorded by the instruments will be used to determine the turbulent kinetic energy (TKE) dissipation rate to quantify the dynamic process affecting dispersant effectiveness.
The project is complete. The final report is posted below.