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JDR Vol.3 No.5 pp. 342-350
(2008)
doi: 10.20965/jdr.2008.p0342

Paper:

Damage to Seisho Bypass due to Storm Waves During Typhoon 0709

Takaaki Uda*, Toshiro San-nami**, and Toshinori Ishikawa*

*Public Works Research Center, 1-6-4 Taito, Taito, Tokyo 110-0016, Japan

**Coastal Engineering Laboratory Co., Ltd., 301, 1-22 Wakaba, Shinjuku, Tokyo 160-0011, Japan

Received:
August 6, 2008
Accepted:
August 21, 2008
Published:
October 1, 2008
Keywords:
Seisho Bypass, damage, Typhoon 0709, offshore sand transport, longshore sand transport
Abstract

Some 1.1 km of the Seisho Bypass along the Seisho coast was severely damaged on September 7, 2007, due to Typhoon 0709 storm waves, closing the road to traffic for emergency repairs. Damage to the highway, caused primarily through wave impact and secondarily by long-term shoreline recession due to decreased fluvial sand supply from the Sakawa River and sand loss into a submarine canyon, was investigated through field observations. A factor contributing further to shoreline recession was the obstruction of eastward longshore sand transport by the Ninomiya fishing port breakwater. Storm waves hit the coastline counterclockwise to normal to the shoreline, causing offshore and westward longshore sand transport with part of the sand transported by the longshore sand transport flowing into the submarine canyon, causing a net sand loss.

Cite this article as:
Takaaki Uda, Toshiro San-nami, and Toshinori Ishikawa, “Damage to Seisho Bypass due to Storm Waves During Typhoon 0709,” J. Disaster Res., Vol.3, No.5, pp. 342-350, 2008.
Data files:
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