OALib Journal期刊
ISSN: 2333-9721
费用:99美元
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近20年辽河三角洲地貌演化
DOI: 10.11821/xb200903011, PP. 357-367
Keywords: 辽河,三角洲,地貌
Abstract:
运用钻探和浅地层探测等最新调查成果,对近20年的辽河三角洲潮流沉积进行了研究。根据不同时期水深地形和卫星影像资料对比分析了现代辽河三角洲潮流地貌变化。现代辽河三角洲的沉积主体位于双台子河口。研究区10m深度内的地层主要包括潮滩相、潮道相和浅海相沉积,其下为古三角洲相。潮滩相沉积物以砂和粉砂为主,分选中等,跳跃和悬浮组分各占50%左右;浅海相和潮道相沉积物主要为软弱的粘土质粉砂和粉砂质粘土,以悬浮组分为主。全新世以来至1896年,研究区为古辽河、古大凌河和绕阳河之间的小海湾。1896年,双台子河被人工开挖为分洪河道以来,口门外形成盖州滩等潮滩,并快速发育。1958年,双台子河建闸后,入海径流量和输沙量减小。目前,双台子河口整体处于淤积状态,潮滩面积不断增加,整体向南、西、北3个方向扩展。潮滩最大淤进速率为87~683m/a,平均淤积速率为0.189m/a。潮滩东侧局部发生侵蚀,平均侵蚀速率为0.122m/a。潮道面积缩小,具有向西、向北迁移的趋势,最大迁移速率为48~200m/a。双台子河口地貌发育受径流、海洋动力和人类活动的影响,沉积物的主要来源由双台子河河流输沙演变为潮流和沿岸流输沙。
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