研究海岸漂砂运动是海岸形态学及海洋动力学中一个重要课题,也是海岸工程上所迫切关心的问题,而在现场上直接观测海岸、水库、河流中砂粒运动,更具有极其重要的意义。通常可根据砂粒粒径的大小不同而采用不同的标记砂来观测泥砂运动。 对于淤泥性砂粒,由于其颗粒极细,采用放射性同位素来作示踪砂是目前最好的方法。 利用放射性同位素作示踪砂,最早见之于德国,以后其他各国相继采用:英国曾于1954年在泰晤士河中利用Sc~(46)玻璃砂作为示踪砂探测了底砂的运动,投送的玻璃砂为845克,平均 Studying coastal drift sand movement is an important issue in coastal morphology and marine dynamics. It is also an urgent concern for coastal engineering. It is extremely important to directly observe the movement of sand in coasts, reservoirs and rivers in the field. Sand generally can be used according to different sizes of sand and sand with different markers to observe sand movement. For silt sand, because of its very fine particles, the use of radioactive isotopes for tracer sand is the best method. The use of radioactive isotope tracer sand, the earliest seen in Germany, after other countries have adopted: Britain had in 1954 in the Thames in the use of Sc ~ (46) glass sand as tracer sand to detect the movement of the bottom sand, delivery Glass sand is 845 grams, on average