This paper deals with the numerical investigations on the stability of solution, Coriolis force, bottom friction, dispersion coefficients, etc., on the application of A.D.I. methed (developed by J.J. Leendertse) to Osaka Bay. This paper also treats the estimation of the reproducibility of the simulation in comparison with the result of model tests and field survey.
　Numerical model is two-dimensional (depth-averaged). Dispersive matter is conservative. The area concerned is limited to the geographical configuration of present state (1971). Efforts are made to meet the input data of the simulation to those of model tests, as many as possible, such as tide, river effluents, dispersive matter, sources of pollution, etc., on account of the comparison with model tests.
　Through the investigations, the following items are confirmed; (i) the effect of Coriolis force is quite small, (ii) dispersion coefficients ranged 10 to 10-2m2/sec affect little effect on the pattern of concentration distribution, (iii) the reproducibility of tidal range and currents to prototype is quite acceptable, an d (iv) dispersion is promoted in the region from sources of pollution to the west or south along the coast of the bay.