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舟山岛马岙岸段海岸演变与水下岸坡冲淤动态

, PP. 64-73

Keywords: 潮流通道,水下岸坡,岸滩,冲淤变化,剖面

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Abstract:

利用不同年份的水深地形资料进行冲淤计算,结合实测水文泥沙、现场岸滩沉积地貌观察、新老海堤分布位置及以往浅地层探测和考古等资料综合分析发现,岸滩地貌形态从大约距今7000a前的一个古基岩港湾经受细颗粒泥沙长期不断地充填、淤积转化为近乎平直的岸段.在自然和人类活动的共同作用下,近370a来海岸线以5.3m/a的速度向海推移,潮滩以0.25cm/a的速率沉积.近40余年来水下岸坡平均冲淤速率为-3.8~2.4cm/a,横向冲淤调整有类似砂质海岸剖面塑造的特性,泥沙经受了在横向剖面"上部微淤、下部微冲"和纵向总体"东侧微冲、中西部微淤"的交替重复调整过程,目前朝着"上部微淤、下部微冲"的均衡剖面调整方向发展.

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