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舟山沈家门海域悬沙输运特征研究 被引量:2

Transportation of suspended sediment in Shenjiamen offshore area of Zhoushan
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摘要 通过对舟山沈家门海域水文泥沙观测站位数据进行处理和分析,探讨了区域悬沙浓度时空分布及影响因素;对各站位单宽净输沙量和输运方向进行了计算,揭示了海域悬沙输运机制。结果表明:受长江、钱塘江等大河泥沙注入和周边岛屿物质输入影响,海域悬沙浓度较高;平面分布上,悬沙浓度有从东北向西南减小趋势,位于莲花洋的C1站位浓度最大,峙头洋C4站位悬沙浓度较小;悬沙浓度垂向上随水深的增加,逐渐升高;在涨、落潮流的影响下悬沙起动、悬扬、沉降、落淤,浓度随潮流流速变化具较高的相关性;通量机制分解计算表明海域悬沙输运以平流输沙项为主导,单宽净输运率大潮期大于小潮期;总体上,泥沙输运有沿水道走向离岸向海运动趋势。 Based on both the data of tidal current and suspended sediment collected from the sea area off Shenjiamen of the Zhoushan Islands,temporal and spatial variation in suspended sediment concentrations during neap and spring tides and their influence factors are discussed in this paper.The transportation characteristics of the suspended matter in the sea area are described by sediment net discharge rate and moving direction.Results show that suspended sediment concentration in the study area is higher than that in surrounding areas,owing to the inputs from the Yangtze,Qian Tang and other rivers as well as surrounding islands.In general,the suspended sediment concentration is spatially in a pattern decreasing from northeast to southwest.The highest sediment concentration appears at the C1 station in Lianhuayang sea,while the lowest at the C4 station in the Zhitouyang sea.Vertically,the suspended sediment concentrations gradually increase with the increase in water depth.The movement of suspended sediment from initiation to settlement is mainly udder the control of tidal movement.There is a high correlation between the suspended sediment concentration and the tidal current velocity.Flux mechanism decomposition shows that suspended sediment is mainly transported in a form of advection.Net transport rate in spring tide is greater than that in the neap tide period.To sum up,the sediment transport in the study area is in a trend towards the sea through channels.
出处 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2018年第1期78-86,共9页 Marine Geology & Quaternary Geology
基金 长江三角洲海岸带综合地质调查与监测项目(舟山群岛新区)(GZH201200506) 浙江省财政配套专项"舟山群岛新区海岸带综合地质调查与监测"
关键词 悬沙 通量机制分解 输运特征 沈家门海域 suspended sediment flux mechanism decomposition characteristics of transport Shenjiamen sea area
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