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引用本文:黄海军,李成治.南黄海海底辐射沙洲的现代变迁研究.海洋与湖沼,1998,29(6):640-645.
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南黄海海底辐射沙洲的现代变迁研究
黄海军1,2, 李成治1,2
1.中国科学院海洋研究所 青岛;266071
摘要:
根据南黄海海底辐射沙洲1973-1993年9个时相陆地卫星影象及海岸带调查资料的分析表明:本区沙洲在1988-1993年间处于侵蚀后退阶段,主要沙洲平均蚀退速度为4.68 km2/a,但沙洲东北部有伸延发展的趋势。沙洲的变迁具有明显的区域差异,北部沙洲变化较快,年均迁移速度为580 m/a;南部沙洲稳定性程度较高、变化较慢,年均迁移速度为280 m/a,目前仍处于缓慢调整阶段.自黄河北移以来,旧黄河及其径流携带泥沙的影响越来越小,潮流等水动力条件对辐射状沙洲的影响不断增强。目前辐射状沙洲形态基本上与本区动力条件相适应,其演化处于较稳定的阶段,突发事件如台风、风暴潮等将是本区今后大范围变迁的主要动力条件。本文最后论述了沙洲变迁的三种主要方式:外围沙洲向中心迁移;潮沟两侧沙洲消长;次级潮沟消长,沙洲变迁。
关键词:  辐射状沙洲  遥感监测  南黄海
DOI:
分类号:
基金项目:国家自然科学基金资助项目,49236120号
附件
A STUDY ON THE PRESENT EVOLUTION OF SUBMARINE RADIAL SAND RIDGES IN THE SOUTHERN YELLOW SEA USING REMOTE SENSING IMAGES
HUANG Hai-jun,LI Cheng-zhi
Institute of Oceanology,The Chinese Academy of Sciences,Qingdao,266071
Abstract:
Based on an analysis of 9 Landsat images, tapes (from 1973 to 1993) and the results of coastal investigations, some conclusions for the changes of submarine radial sand ridges in the southern Yellow Sea have been obtained. The sand ridges in this area are eroded in the outer part. The area of sand ridges above the mean sea level is decreasing between 1988 and 1993. The average erosion rate is 4.68 km2/a and the rate becomes smaller. There is a great regional difference in the changes of the sand ridges: the sand ridges in the southern part is more stable than those in the northern part The rate of shoreline changes in the southern part is about 280 m/a, but this is up to 580 m/a in northern part where most of sand ridges are still in the stage of readjustment. Some of them are even expanding in the northeast of this area.

Three types of the submarine radial sand ridges’ changes are identified. The factors that affected the formation of these sand ridges have changed. The runoff is generally replaced by tide flows and waves; the sediments from the old Huanghe River and its submarine delta, which once were the main source of sand ridges, are placed by other sand sources such as sediments re-suspended by tidal current.

Now, there is a balance between the landform of the sand ridges and the dynamic environment in the research area, especially in the southern part where there have been few changes in some of the sand ridges since the beginning of this century. Some large storm events such as typhoons are the main factors that cause the changes of sand ridges.

Key words:  Radial sand ridge, Remote sensing monitoring, Southern Yellow Sea
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