FIELD INVESTIGATION ON FOOT PROTECTION EFFECT OF GRAVEL BEACH

Abstract

 Field investigation on the stability and the foot protection effect of gravel beach was carried out at Yamanishi area of the Ninomiya coast. The changes in longitudinal profiles and grain size composition were investigated along with the observation of sand movement using color sand. Although gravel beach extends along the seawall of the highway on this coast, the gravel layer was stable against storm waves, and gravel placed near the shoreline was maintained near the shoreline after the storm waves and transported toward the foot of the seawall.