Historically, many disasters at Shimoniikawa Coast has occurred by high waves called Yorimawarinami from east. The direction of longshore sand transport of the Shimoniikawa Coast is eastward. In Nyuuzen-machi and Asahi-machi located in the east from the Kurobe River mouth which becomes the source of supply of the sand, many houses moved because of beach erosion. In such circumstances, intense high waves by the low pressure hit these areas on February 24, 2008, so that coastal protection facilities in Kurobe-shi, Nyuuzen-machi and Asahi-cho got damaged and, furthermore houses were flooded and destroyed by overtopping waves.
In this paper, various observation data in Shimoniikawa Coast of Yorimawarinami was analyzed by and the cause of the disaster was considered.
