A FUNDAMENTAL STUDY ON ECO-DRR FUNCTION OF BEACHES ALONG KII CHANNNEL

The coastal sandy beach is maintenance-free green infrastructure with self-restoring capability and it is expected to reduce high wave damages with the coastal forest. A number of valuable sand beaches are distributed as a conservation of ecosystems and sightseeing and landscape resources along the Kii Channel. However, depending on the scale of liquefaction caused by the Nankai Trough Earthquake, these functions may not be sufficiently appeared. In this study, we studied Eco-DRR (Ecosystem-based Disaster Risk Reduction) function of sandy beaches in this area through simple liquefaction experiments. The correlation with the ease of liquefaction was high in the order of water content, uniformity coefficient and the coefficient of form unevenness and it was considered that the state of void has impact on the onset of Eco-DRR function.