A Method Preventing Offshore Sand Loss Owing to Ebb Tidal Currents

Abstract

In a tidal inlet, a part of littoral sediment is transported offshore owing to the ebb tidal currents, resulting in permanent loss of nearshore sand. The ordinary sand-bypassing method, in which simply sand deposited upcoast is transported downcoast, is ineffective for preventing this sand loss. In this study, a sand-raise method, in which sand is pumped up from an offshore zone and disposed of on downcoast shoreline, is proposed, taking Imakiri-guchi inlet of Lake Hamana as an example. The effectiveness of the method is numerically investigated using the BG model proposed by Serizawa et al. (2006). It is shown that this method can be a practical tool to prevent offshore sand loss.