Field Experiment on Change in Thickness of Sand Mixing Layer on Jinkoji Coast

Abstract

Field experiment on changes in thickness of the sand mixing layer was investigated on the Jinkoji coast, where beach nourishment using coarse material has been carried out. Four trenches were excavated on the shore face, andcoarse material, fine sand and their mixture were filled in each trench, and subsequent mixing due to waves were investigated. Comparing the mobility of sandy beach composed of various materials, minimum mobility was obtained at gravel, and the mobility of the beach composed of the mixture of sand and gravel was the largest, implying that the effect of the beach nourishment using the mixture of sand and gravel is inferior to that using gravel only.