Abstract
This study aims to evaluate the stability of steal gabion mattress against tsunami-induced strong flow through hydraulic model tests. Performed tests are to observe the scaled mattresses on the mound under steady flow condition. The flow velocity was increased step by step and the relationship between number of damaged mattresses and the velocity was observed. A series of tests were performed to investigate the effect of mattress layout condition and the Isbash coefficient was determined from the critical velocity observed in each test case. Their coefficients are almost same as one of precast concrete armor units or embedded stone. This study shows high performance of the gabion mattress.
