南黄海海底辐射沙洲的现代变迁研究  

A STUDY ON THE PRESENT EVOLUTION OF SUBMARINE RADIAL SAND RIDGES IN THE SOUTHERN YELLOW SEA USING REMOTE SENSING IMAGES

作　　者：黄海军[1] 李成治[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《海洋与湖沼》1998年第6期640-645,共6页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金!49236120

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4．68km2／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580m／a；南部沙洲稳定性程度较高、变化较慢，年均迁移速度为280m／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。Based on an analysis of 9 Landsat images, tapes (from 1973 t0 1993) and the resultsof coastal inveshgahons, some conclusions for the changes of submarine radial sand ridges in thesouthm Yellow Sea have been obtrined. The sand ridges in ffos area are endd in the outer peThe area of sand ridges above the mean sea Ievel is decreasing between 1988 and l993. Theaverage erosion rate is 4.68km2 / a and the rate becomes smaller. There is a great regional differencein the changes of the sand ridges: the sand ridges in the southem part is more stabe than those inthe northem parL The bo of shoreline changes in the southem part is about 280m/a but this isup to 580m / a in northem part where most of sand ridges are still in the stage of readjustment.Some of them are even expanding in the northeast of mis area3 types of the submarine radial sand ridges changes are identified. The factors tha affected theformation of these sand ridges have changed. The runoff is generally repleced by tide flows andwaves; the sediments from the old Huanghe River and itS submarine delta, which once were themain soaree of sand ridges, are pleced by other sand soarees such as sediments re－suspended bytidal currentNow, there is a balance between the landrorm of the sand ridges and the dynamic environmntin the researeh area, especially in the southem part where there have been few changes in som ofthe sand ridges since the begindng of mis century. Some large storm events soch as typhoos arethe main factors that cause the changes of sand ridges.

关 键 词：辐射状沙洲 遥感监测 南黄海 海底变迁 沙洲 

分 类 号：P737.14[天文地球—海洋地质]