Effect of the coastal conservation due to beach nourishment of Totori sand dune coast

Tottori Sand Dune Coast located at western part of Japan is a sandy beach with a length about 8km facing Sea of Japan. The coast has been eroded starting around 1940s and the beach nourishment project has been carried out to restore the shoreline since 2005 at Tottori Sand Dune Coast. In the project, the deposition sands at port and river mouth were transported to the erosional area and injected in the region of the offshore erosional area and the backshore area and the total volumes of the sand are about 400,000m3 from 2005 to2011. However the effects of the project are not clarified and the detailed examination is not performed. The purpose of this study is to investigate the movement of the injected sand and the effect of the beach nourishment. In this study, using the bottom sounding data from 2002 to 2011, the sand volumes were estimated and the shoreline changes were investigated. Also, at the Tottori Port adjacent to the Coast, the amount of the sediment is estimated as well as Tottori Sand Dune Coast. From these analyses, the beach nourishment are effective and the large amount of the sediment placed at land area restored the shoreline quickly.