Sediment Transport Characteristics on a Scoured Channel behind Submerged Breakwater

Abstract

In Niigata west coast, a belt-shaped scour is formed behind the submerged breakwater. The scour is considered as a cause of the loss of filled sand. In this study, field experiments by installation of filled sand and fluorescent tracer were conducted to examine the sand movement around the scour. The result of experiments indicates that the sand on the filled beach is transported in the offshore toward the scour and that the sand settled in the scour is also transported along the submerged breakwater and flows out. These characteristics have become clear, and therefore, basic policy of countermeasures to prevent the loss of filled sand has been suggested.