IDENTIFICATION OF FLOOD-RELATED SEDIMENTARY FEATURES WITH NON-DESTRUCTIVE SUBSURFACE EXPLORATIONS

Abstract

  This study addresses procedures for identifying flood-related sedimentary features in view of their future incorporation into community-based hazard mapping. The pilot study area selected is a 400m-wide floodplain to the left of the main channel of the Uji River. The flood-related subsurface features there (such as old river channels) were investigated using non-destructive geophysical explorations, specifically in terms of resistivity prospecting as well as surface-wave seismic profiling. Their validity was examined against extensive surveys by automated Swedish weight sounding. Furthermore, three columns of continuous sediment cores were retrieved from the floodplain, offering “ground truth” through precise facies observations.