Abstract
Shirakawa estuary area subsided about 0.4m due to Kumamoto earthquake on April 2016. This ground subsidence is corresponding to a sea level rise rate for a period of about 70 years. Therefore a new long term prediction of delta topography was carried out in consideration of the ground subsidence and the changes of sediment discharge from Shirakawa River with the existing process model. The clinoform will retreat by about 2000m toward the onshore side, and then the subtidal area will be decrease. These calculation results are different from a previous study. Also the amount of sediment discharge has an impact on the change of topography in the future.
