Field Survey and LES Simulation of Dispersion of Treated Waste Water Disposed in a Coastal area

Abstract

The flow velocity, salinity and temperature distributions were obtained using Acoustic Doppler Current Profiler (ADCP)and conductivity and temperature sensors in the coastal area off Tarumi of Kobe-City. The results are analyzed to obtain the diffusion of effluent disposed from an outfall of a nearby treatment plant. Based on this data, a fully three-dimensional Large Eddy Simulation (LES) method has been performed to reproduce the current and the dispersion of the concentration field of the disposed waste from the outfall. No approximation on the pressure distribution and the position of the water surface are made except for the filtering effects due to the unresolved motion. The overall flow appears to be reproduced but the details of the turbulent flow and the reproduction of the turbulent motion responsible for the dispersion need to be further verified with more detailed data.