长江口外泥沙向南输运速率的变化探讨——以朱家尖岛附近海域为例

被引:7
作者
吴晗 [1 ]
杨世伦 [1 ]
邓兵 [1 ]
张卫国 [1 ]
罗向欣 [1 ,2 ]
张朝阳 [1 ,3 ]
机构
[1] 华东师范大学河口海岸学国家重点实验室
[2] 中山大学海洋学院
[3] 长江口水文水资源勘测局
关键词
沉积速率; 浙-闽沿岸流; 朱家尖岛; 东海内陆架泥质沉积带; 长江入海泥沙;
D O I
暂无
中图分类号
P731 [海洋水文学];
学科分类号
摘要
采用浅地层剖面测量、沉积物柱样测年和海图水深计算对比相结合的方法,探讨位于长江入海泥沙向南输送通道上的朱家尖岛海域的泥质沉积速率的历史变化,并通过水文泥沙测量和沉积物取样分析寻找长江入海泥沙向南输送的佐证。结果表明:朱家尖岛海域全新世海平面上升以来泥质沉积厚度为5~20m,相当于沉积速率0.06~0.25cm/yr;1840~1960年区域平均沉积速率为1.4cm/yr,近60年沉积速率仅为此前120年沉积速率的一半左右。据此推断:全新世后期以来该海域泥质沉积速率先后经历了一个长期(千年尺度)缓慢的增大阶段和一个短期(年代尺度)迅速的减小阶段,与长江流域人类活动和河口湾充填作用共同造成的入海泥沙通量的总体变化趋势相吻合。
引用
收藏
页码:77 / 82
页数:6
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