Abstract
The sediment routing process in natural beach-dune systems plays an important role for sustaining the topography of sandy beach. Recent practices of coastal protection, however, tend to suppress sediment transfer between a coastal dune and the fronting sandy beach, reducing resilience of the beach subject to severe wave forcing. This study explores linkage between the beach and dune processes. The resistivity explorations and surface-wave prospecting performed on the coastal dune identified the sedimentary architecture of it, in conjunction with examination of existing borehole logs. Notably, there occurs a buried deposit of old sandy dune below the current beach surface. Furthermore, the examination of ten vibrocores retrieved from the seabed suggests that the deposit of well consolidated old dune extends out to the sea.
