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应用端元分析模型对南黄海表层沉积物粒度数据进行了反演,分离出四个端元.根据各端元频率分布曲线及平面分布特征,结合南黄海沉积动力格局,分析了各端元与研究区物源和水动力环境的对应关系.端元1和端元2反映了海洋动力过程对陆源沉积物的输运和分选,端元3和端元4反映了海洋动力对残留砂的改造.南黄海海洋锋面主要对陆源较粗颗粒沉积物的输运有影响,陆源较粗颗粒沉积物基本不能跨越山东外海海洋锋面.陆源细颗粒沉积物受海洋锋面影响较小,并在潮汐动力条件较弱的南黄海中部大量沉降,构成南黄海中部泥质区主体.南黄海中部细颗粒沉积物可能有西北和西南两个不同物源方向,其北部沉积物主要来自沿岸流输运跨越锋面后的黄河沉积物的细颗粒部分,西南部沉积物主要来自跨越苏北海洋锋面具有长江和黄河混合物源的苏北沿岸沉积物的细颗粒部分.和直接利用沉积物粒度数据研究沉积动力环境的传统方法相比,利用沉积物粒度端元分析方法分离出的沉积物不同端元分析区域沉积动力环境效果更好.
Endmember analysis model was used to inverse the sediment grain size data in the South Yellow Sea, and four end elements were isolated.According to the frequency distribution curves and plane distribution characteristics of each terminal element and the sedimentary dynamic pattern in the South Yellow Sea, The relationship between the source and the hydrodynamic environment in the study area: Endmember 1 and Endmember 2 reflect the transport and sorting of terrigenous sediments by marine dynamic processes, and Endmember 3 and Endmember 4 reflect the influence of marine motive force on residual sand The main frontier of the South Yellow Sea had an impact on the transport of coarse sediments from terrestrial sources, and the coarse terrigenous sediments could not cross the offshore frontier of Shandong off-shore.The terrigenous fine-grained sediments were less affected by the frontal ocean front, In the middle part of the southern Yellow Sea, where the conditions are weaker, a large amount of subsidence is formed, forming the main muddy area in the central part of the southern Yellow Sea.The fine-grained sediments in the central part of the South Yellow Sea may have two different provenance directions in northwest and southwest China, The fine-grained sediments of the Yellow River sediments are mainly from the fine particles of sediments along the northern coast of the Yangtze River and the Yellow River across the front of the northern Jiangsu Ocean front Min. And using conventional methods of grain size data directly Deposition dynamic environment as compared to the use of grain size distribution analysis Endmember different ends of the separated deposit element analysis of depositional environment better dynamic.