Development of 2-D Highly Accurate Diffusion Simulation Model in Bay and Coastal Waters

Abstract

Three different methods for estimating dispersion coefficient in 2-D diffusion simulation model are discussed. The basic ideas for constructing the dispersion coefficient are as follows:(1) applying k-e turbulence model to 2-D plane diffusion simulation.(2) taking the dependence of dispersion coefficient on instantaneous tidal current into account.(3) considering the difference between longitudinal dispersion and vertical eddy diffusion which is remarkable in 2-D treatment.Since the all estimations include the effects of stratification and drift current, the final formulae of dispersion coefficient are expected to be very practical and used widely in 2-D numerical calculation of pollutant diffusion.