抄録
A net-type unit which composes about 30cm rubbles in it is developed. The unit is intended to reduce the wave energy and tsunami pressure generated in accidental condition beyond the design. The rubble layer overlapped in the polyester nets can reduce the impulsive forces due to the huge wave and tsunami. Several stability coefficients have to be revealed to make a design of seawalls and breakwaters. A water channel experiment is carried out to estimate the stability coefficients using the scaled unit model of 1/50 related with 6 and 8ton in prototype. The stability in tsunami flows is moreover investigated in order to obtain the other stability function determining the applicability of the unit as counterweights.
