大川における塩分遡上の解析について

Abstract

This study deals the salinity intrusion in an estuary channel by means of numerical analysis.Basic equations which express the distributions of velocity and salinity in the longitudinal anddepth-wise directions are transformed into the finite difference scheme, in which the eddy viscosityand the eddy diffusivity are assumed as the functions of local Richardson number. The modeldeveloped here is applied to the Ohkawa (Old Yodo River) in Osaka city. The results obtainedare a good realization of its actual behaviour, at least in qualitative aspects. The salinity intrusionaffected by the release operation of discharge at Kema weir is also simulated by using this model.