粉沙质海岸泥沙特性实验研究

本研究根据泥沙性质，提出了滩面泥沙中值粒径介于０．０３ｍｍ￣０．１２ｍｍ的海岩为粉沙质海岸，并对其泥沙特性进行了实验研究。结果表明，粉沙质海岸泥沙特性除了与中值料径有关外，还与级配有关。当泥沙中粘性细颗粒物质含量较高时，其整体体现淤泥质泥沙特性，当泥沙中粘性细颗粒物质含量较低时，整体体现散粒体泥沙特性，其运移形态前者是以悬移质运动为主，后者地既有悬移质运动又有推移质运动。对于推移质输沙，其输沙率不

Experiment Study of Sediment Characteristics in Silty-sand Coast

Based on the characteristics of sediment,the authors put forward that the coast with the sediment diameter between 0.03mm to 0.12mm is categorized as the silty-sand coast,and its characteristics are studied by experiments. The results show that the characteristics of sediment in silty-sand coast is related not only to the sediment diameter,but also to the size distribution. When it contains much more cohesive particles the overall characteristics are that of mud. When it contains less cohesive particles the overall characteristics are that of loose sand particles. The former is suspended-load movement and the latter are suspended-load and bed-load movement. For the bed-load movement,the rate of transport is related not only to the dynamic condition,but also to the sediment diameter. In the same dynamic condition,the finer the sediment,the smaller the rate of bed-load transport will be.