ORIGIN AND EVOLUTION OF HOLOCENE DOUBLE BARRIER-LAGOON SYSTEM IN WEST COAST OF YELLOW SEA
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摘要: 在海面稳定的情况下,非三角洲海岸的障壁坝-潟湖通常是单一的。黄海西岸山东省胶南市琅琊台北夏家村双重障壁坝-潟湖形成于小海湾内,有充足砂粒级沉积物供应,沿岸输砂的下游一侧受到陆地阻隔,内障壁坝北部更宽、更高,在NE风暴浪的作用下潮流口由位于障壁坝北端改为在障壁坝南端。内障壁坝南端外侧存在岬角,岬角南侧曾存在更小的海湾。它被淤满后,沿岸输砂到达内障壁坝南端外侧的岬角,与输送到南端潮流口外的砂堆积在一起形成砂咀,逐渐向下游方向伸展发育成外障壁坝。外潟湖(河口湾式潟湖)发育在两个障壁坝之间,形成双重障壁坝-潟湖。Abstract: The Holocene double barrier-lagoon system on the west coast of the Yellow Sea consists of a 1600 m long inner barrier, a 1550 m long outer barrier, a 0.994 km2 inner lagoon and a 0.335 km2 outer lagoon (back-barrier estuary). The inner barrier formed about 7000-2500 aBP, gradually extending from south to north. The tidal inlet changed its location from the north end to the south end of the inner barrier about 2500 aBP under the strong NE storm wave action. After the southern small bay was filled up, northward longshore current transported sediments onto the north of the 12.0 highland cape. These sediments and the sediments transported out of the south end tidal inlet together formed a spit at the north of the 12.0 highland cape, which has gradually extended northward and formed the outer barrier and an outer lagoon between the two barriers.
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Key words:
- barrier bar-lagoon /
- origin /
- evolution /
- longshore sediment transpotation /
- Yellow Sea
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