CALCULATIONS OF SILTATION MECHANISM OF INTERTIDAL FLAT NEAR THE SHORELINE

Abstract

 It has been pointed out that intertidal tidal flats play a major role in preserving the water quality and biological environment of inner bays, and conservation of existing intertidal flats and creation of artificial intertidal flats have been conducted. In the Nakatsu intertidal flat in Oita Prefecture, a decrease in the catch of clams has been a problem in recent years. In this study, focused on the muddiness of the intertidal flat, which is one of the causes of the decrease in the catch of clams., and conducted a qualitative reconstruction of the Nakatsu intetrtidal flat by field observations and wide-area sediment dynamics in the coastal areaby using WDM-POM. But there is a problem of not being able to reproduce the muddiness at the shoreline. This paper presents numerical simulations of the formation of a mud area the shoreline of an intertidal flat, and presents numerical simulations of mud dynamics on intertidal mudflats with flat topography and constant gradient. The numerical results suggest that tidal fluctuation and tidal flat topography have an influence on mud agglomeration and sedimentation.