Abstract
Comprehensive management for sandy beach is necessary to perform both the protection due to coastal hazard like tsunami and conservation of coastal environments. In the present study, we examined tsunami mitigation effects in sandy coasts and estimated sediment budget for sandy coasts. For these purposes, we conducted field measurements and data analysis in the Kujukuri beach with sandy coasts. The results indicated that 1) wide beach width (> 50 m), offshore breakwater and uniform dune height may decrease appreciably tsunami-overflowing erosion of the dunes, and 2)the sediment supply from inlands into Kujukuri beach was comparable to that from coastal cliff. This means that the comprehensive measures for beach erosion may have an important role for tsunami mitigation in sandy coasts.
