Abstract
Complex principal component analysis (CPCA) was applied to examine the medium-term geomorphological processes of the Mukawa coast in northern Japan, using an 18-year series of bathymetry survey data. The result of CPCA shows that the westward wave energy flux significantly influences on the geomorphological changes over the study area. The pattern of the geomorphological changes due to the westward waves emerged in the first mode of CPCA. The second mode of CPCA for the shallower region in front of the river mouth shows the pattern of geomorphological changes due to the river discharge.
