2019 Volume 75 Issue 2 Pages I_647-I_652
The relationship between countermeasures against beach erosion and tsunami was investigated, taking the area around the artificial headland No. 12 on Horikawa Beach located in the north part of the Kujukuri coast as an example. On this beach, southwestward longshore sand transport prevails and HLs have been constructed from upcoast, resulting in the expansion of the eroded area. Also, sand dune with 6 m height has been preserved as a measure against tsunami on this beach, but such sand dune has been eroded while losing its effect. This situation has been investigated by the comparison of aerial photographs and field observation. Urgent measure against beach erosion should be taken so as for the effect of sand dune against tsunami to be maintained.
