The stability of stones for a rubble mound used as a habitat for rocky shore fisheries resourceswas examined by two-dimensional hydraulic model experiment using irregular waves. We examined thescattering characteristics of stone by changing the structure of the mound and the waves conditions. Based on the results we proposed a calculation method of stable weight of stone materials forrubble mound habitat. The stability number Ns was formulated as a function of the ratioof water depth to wave length. We also examined the influence of weight distributionof stone materials on the mound stability.
