AbstractNational Route 134 of Japan is a scenic coastal highway about 30 miles southwest of downtown Tokyo. Its highly traveled two lane section in the ancient capital city of Kamakura (1.4 km, i.e., 0.85 miles long) is sandwiched by a sandy ocean beach on the south side and a narrow gauge railroad or rock outcrop on the north side. The 50- year old concrete seawall abutting the highway above suffered scour and settlement from a typhoon-caused storm surge in the past with the rest of the seawall also showing heavy deterioration.
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