粒径別浮遊砂濃度の時間変動特性に関する研究

抄録

A sediment size distribution sensor (LISST-100) was employed to conduct field measurements of graded grain size in suspended sediment and its volume concentration under storm conditions. To investigate the characteristics of temporal variation of suspended sediment concentration (SSC), thirty measured grain sizes were classified into three groups, SSC₁ (2.7-100μm), SSC₂ (100-200μm) and SSC₃ (200-350μm). The results of data analysis show followings:(1) Correlations between total SSC and SSC_1-3 are dependent on averaging duration.(2) Some grain sizes have significant influence on total SSC variation when total SSC becomes higher. It is important to consider the grain size distribution in SSC.(3) Fluctuations of SSC₃ are affected by the surface elevation in lower frequencies.