Kansai Airports

 High wave mitigation – heightened seawalls

Kansai International Airport was hit by several mega-typhoons in 2004, and was exposed to some of highest tides and waves recorded in its 26 years. The airport sustained damage from the waves that came over the seawalls and eroded the existing roads.

This involved extending the concrete walls to a height that would be able to withstand the one-in-fifty-years wave heights experienced, and the highest tides on record in Osaka Bay (assumed to be during Typhoon Nancy in 1961).

<Illustration of raised seawalls>

<Work on raising seawalls>

<Work on raising seawalls>