江苏岸外辐射沙洲区沙岛形成过程的初步研究

Preliminary Study on the Developing Mechanism of Sandy Island on the Radial Tidal Sands off Jiangsu Coast

江苏岸外辐射沙洲曾经历了由暗沙到明沙的发育过程，进入 20 世纪 90 年代后，近岸的沙洲由于持续淤高并高出大潮平均高潮位而成为沙岛。通过卫片判读和实地观测对沙岛自然属性和形成机制进行了初步研究，认为条子泥西部多年来的持续淤积和潮沟的稳定是沙岛形成的关键，而潮汐和风暴潮是沙岛形成的动力因素。沙岛的形成说明辐射沙洲的发育进入一个新阶段即成岛阶段，并标志着沙洲并陆过程的开始。

The radial tidal sands off Jiangsu coast have developed from the submerged sandbar to the emerged one. Since the 1990s, some nearshore sands have accreted gradually become higher than the mean high water level and developed into a sandy island. Interpretation of satellite images and field investigations indicate that the gradual accretion of tidal flats and the stabilization of the tidal creeks on West Tiaozini are the keys to the development of the sandy island, and the tide and storm are the necessary dynamic factors. The emergence of the sandy island shows that the development the radial tidal sands has entered a new stage of islandization, and indicates the beginning of landization of the sands.