SEDIMENTARY DYNAMIC ENVIRONMENT AND ITS BEARING ON MATERIAL TRANSPORT IN DALIAN BAY
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摘要:
对大连湾内部及外侧海域采集的46个表层沉积物进行了粒度分析，研究了大连湾现代沉积动力环境、沉积物运移、搬运方式及营力的空间差异，探讨了大连湾内外沉积物运移交换及其影响机制。大连湾内物质来源较少，湾外基岩海岸的侵蚀碎屑、外海潮流携带悬浮沙是本区沉积物的主要来源。岬角沿岸、三山岛周边海域长期波浪辐聚，形成高能扰动环境；三山岛外侧水道为强潮流冲刷环境，涨、落潮流流速上的差异导致双跃移组分；大连湾内潮流波浪较弱，沉积物以悬移组分为主。湾口近岸以波浪破碎形成的沿岸流为主要搬运营力，沉积物自老窝咀、棒棰岛沿岸向大连湾内输运；湾口的中北部物质的交换以潮流为主要搬运营力，向北运移进入大连湾北部。大连湾虽然内外物质的交换较弱，但却具有对来自北黄海物质的“捕获”作用，对于研究古黄海暖流的形成演化指示了新思路。
Abstract:Particle size analysis was carried out for 46 surface sediment samples collected in the inner and outer areas of Dalian Bay. Based on the results, the spatial variation in modern sedimentary dynamic environment, the sediment transportation and transportation mechanisms are studied in Dalian Bay. Exchange of sediments inside and outside the bay and its impacts are discussed. Dalian Bay has only a few sediment sources. Erosive debris from the bedrock outside the bay and the suspended sediment from the outer water are the major sources of sediments. Waves meet at the areas around capes and the Sanshan Island, forming a turbulent high-energy environment. The water channel outside the Sanshan Island is a scouring environment under the strong action of currents. The difference in current velocity between the flood and ebb currents result in the formation of double jumping components. Tidal wave is weak in Dalian Bay, and the sediment is mainly composed of suspended components. The coastal current formed by wave break is the main force keeping sediment moving along the shore of the Bay, and sediments are transported from the Laowozui Cape and Bangtao Island into the Dalian Bay. The exchange of material in the northern central bay is dominantly controlled by tidal currents, and sediments moves northward into the northern part of Dalian Bay. Although the exchange of materials is weak inside and outside Dalian Bay, the bay is a trap to capture the materials from the North Yellow Sea. The results may provide a new way of thinking to study the formation and evolution of the ancient Yellow Sea warm current.
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Key words:
- Dalian Bay /
- grain size /
- sediment transport /
- sedimentary dynamic environment
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