抄録
It is very important for an environmental assessment of tidal flat ecosystem such as some benthic animals that clarifying formation mechanism of particle size distribution of sediment. The main aim of this research is the development of a method to evaluate the equilibrium particle size distribution in large river mouth. We considered a river with larger influences of waves than river currents and modeled the formation mechanism of sediment. It was assumed that the sand particles which correspond to the critical shear stress under waves deposit and form a particle size distribution depending on the frequency of disturbance of waves in this model. The particle size distributions which estimated based on a wave statistical data well coincided with field survey data.
