Tohoku Tsunami Survey
Tohoku Tsunami Survey
Tohoku Tsunami Survey
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Onagawa<br />
Outflow<br />
• Pressurized by flow stagnation.<br />
• Wall reinforcing tested to be JIS<br />
G3112 Grade SD 390.<br />
• The taller wall rupture occurred when<br />
the return flow ≥ 5.5 m/s.<br />
• Other shorter walls do not yield and<br />
so v < 7.5 m/s.<br />
• Video shows outflow between Marine<br />
Pal buildings at 7.5 to 8.5 m/s.<br />
Concrete<br />
Building<br />
5.5 < v < 7.5 m/s<br />
Steel<br />
Building<br />
Marine Pal<br />
Buildings<br />
7.5 < v < 8.5 m/s
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