1996 Volume 40 Pages 505-510
In numerical calculations of salinity intrusion in a well-mixed type estuary like the Chikugo river, 1-D numerical diffusion model is in general used. It is quite important to evaluate the local dispersion flux precisely in this model.We tried to make up the evaluation method for this salinity flux by using some experimental data.
As the result of this study, the facts that the local dispersion flux cannot be described by the first derivative of salinity concentration only and that because the maximum density of salinity in the estuary is limited by the boundary condition of that at the sea the additional expression of flux described by the second derivative is necsssary are made clear. The use of new expression makes it possible for the 1-D model to perform the simulation well.
