Analysis of Tottori Dune deformation using EOF method

Abstract

 Tottori Dune, located in San-in Coast, is the largest dune in Japan and stretches 16 km in the longshore direction and 2 km in the cross-shore direction. This study investigates characteristics of Hamasaka Dune deformation, which is a main part of the Tottori Dune in the late 2000s through three-dimensional eigenfunction analysis using monthly ground elevation data. The first spatial and temporal functions demonstrate that sedimentation occurred in the east side of the dune and erosion occurred in the west side and, additionally, the variation accelerated from 2007 to 2008. The relationship between vegetation cover ratio and the first spatial function indicates that vegetation has a function to stabilize the dune morphology.