夏季浙江沿岸陆架区泥沙输运机制

陈斌; 高飞; 刘健

夏季浙江沿岸陆架区泥沙输运机制

青岛海洋地质研究所国土资源部油气资源和环境地质重点实验室, 山东青岛 266071;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室, 山东青岛 266061

基金项目: 国家自然科学基金重点项目（41330964）；地调项目（GZH201200506）。

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出版历程
- 收稿日期: 2016-05-22

Sediment transport mechanism in the Zhejiang inner continental shelf in summer

Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China

摘要

摘要: 基于2014年夏季浙江沿岸陆架区的水文、泥沙、底质沉积物等实测资料，运用物质通量分析方法和Gao-Collins粒径趋势分析法，探讨了泥沙的输运通量、输运方向、动力机制及净输运趋势。夏季，近岸含沙量规律性较强，由西至东逐渐降低，由南至北逐渐升高，且与潮流有非常好的对应关系，呈现出明显的潮周期变化特征。研究区净悬沙通量自岸向外海迅速变小，悬沙输运中平流输运占主导地位，其次是垂向净环流对悬沙输运的影响，近岸海域表现为向海输沙，30 m以深海域表现为东北向输沙，同时台湾暖流的屏障作用也影响了悬沙向海扩散。粒径趋势分析显示浙江沿岸陆架表层沉积物的长期输运机制为由东北向西南输运，在流系以及海底地形的影响下，中部海域出现粒径趋势较弱的沉积中心。而在夏季，悬浮泥沙主要为平行岸线向东北输运，估算每天进入研究海域的净悬浮泥沙约为1.9×10⁶ t。
- 泥沙输运 /
- 潮流 /
- 余流 /
- 物质通量 /
- 趋势分析
Abstract: Based on the measured data and information about tidal current, suspended sediment concentration, surface sediment samples the Zhejiang inner continental shelf in summer, 2014. Material flux decomposition method and Geo-Collins grain size trend analysis was carried out to delineate suspended sediment flux,transport direction and dynamics mechanism and net sediment transport patterns of the study area. The results indicate that the suspended sediment concentration decreases from west to east, increases from south to north, which is well related with tidal current and oscillated with the frequency of semidiurnal tide as well. The suspended sediment flux quickly decreases towards the sea. The net suspended sediment transport is mainly controlled by average current transport, and the second place is gravitational circulation transport. The suspended sediments are primarily transported towards the sea, but in deeper than 30 m water region, under the influence of the Taiwan Warm Current, transport towards northeast direction is found in the study area. The Taiwan Warm Current would also probably block the suspended sediment diffusion towards the sea. Grain size trend analysis result indicates that surface sediments are mostly transported from northeast towards southwest, under the influence of currents and morphology, a weaken trend sedimentary region is founded in the middle study area. The net suspended sediment is estimated at about 1.9×10⁶ t per day with the tide condition in summer, and transports towards northeast.
- sediment transport /
- tidal current /
- residual current /
- sediment flux /
- grain size trends analysis

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