Abstract
For elucidating the sand movement characteristics at Namiita coast, in situ and flume experiments were conducted. Field experiments which used colored sand were conducted from Dec. 2014 to Feb. 2015 and from July - Oct. 2015. For both seasons, colored sand (d50=0.6 and 1.0mm) has been confirmed to move not only offing direction (within the shallow region from the critical water depth for the sediment movement) but also shore direction from the setting point. If similar material will be used for the beach nourishment, there is a possibility to contribute to the re-formation of sandy beach.
Flume experiments with considering different submarine topography (before and after 2011 Tsunami) and wave conditions were conducted. By using experimental results, change of submarine topography through the year was clarified. Even submarine topography after 2011 Tsunami, a tendency of sedimentation was confirmed to be maintained around beach line. These results suggest that sandy beach in Namiita coast might be reformed by conducting beach nourishment.
