Beach Improvement and Monitoring
The sediment properties such as grain size as well as sorting,skewness, color, mineral components and chemical elements have much information on coastal processes.Sand samples along the shorelines and in the rivers in Japan were assayed for chemical elements using X-ray spectrometer. Samples contained more than 60% Si, Al，Ca，Fe，Na and Mg less than 10 %. Si，Al，Ca and Fe were the significant chemical elements. The spatial variations of first mode of Si are related to sediment dynamic behavior. The transport regime is net accretion when the first mode value of Si is increasing, and net erosion when being decreasing.