伶仃洋洪季悬沙平面分布特征及成因探讨

何嘉伟; 贾良文; 韦献革; 贾妍红; 程聪

doi:10.3969/j.issn.0253-4193.2017.09.003

伶仃洋洪季悬沙平面分布特征及成因探讨

doi: 10.3969/j.issn.0253-4193.2017.09.003

1.
中山大学海洋科学学院近岸海洋科学与技术研究中心, 广东广州 510275
2.
中山大学环境科学与工程学院, 广东广州 510275

基金项目: 国家自然科学基金"复杂动力条件下磨刀门河口长周期地貌演变研究"（41376101）；国家重点研发计划项目"珠江河口与网河演变机制及治理研究"（2016YFC0402603）；广东省海洋渔业科技与产业发展专项"珠江口伶仃洋围填海工程的累积环境影响及生态修复措施研究"（A201401D01）

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出版历程
- 收稿日期: 2016-11-07
- 修回日期: 2016-12-21

The 2D distribution characteristics and formation mechanism of suspended sediment concentration during the flood season in the Lingdingyang Estuary

1.
Coastal Ocean Research Center, School of Marine Science, Sun Yen-sat University, Guangzhou 510275, China
2.
School of Environment Science and Engineering, Sun Yen-sat University, Guangzhou 510275, China

摘要

摘要: 基于伶仃洋河口2007年洪季（8月）潮流和泥沙现场观测资料，通过实测资料分析结合二维泥沙数值模型的方法，分析其悬沙浓度平面分布特征。结果表明，悬沙浓度从伶仃洋湾顶虎门至湾口沿西槽向海在纵向上呈现出先减小再增大后减小的变化趋势；横向上，西槽最大，东槽和中滩次之；内伶仃岛西北侧海域为含沙量高值中心。悬沙纵向输移机制分析表明，伶仃洋洪季输沙主要贡献项为平流向海输沙、潮汐捕集和垂向环流的向陆输沙，其中后两项在内伶仃岛附近的贡献较大。潮流、径流来沙、径潮强度对比以及地形边界作用为悬沙场平面分布差异的主要成因。
- 伶仃洋 /
- 悬沙浓度 /
- 平面分布特征 /
- 成因探讨
Abstract: Based on the observed data of current and suspended sediment concentration (SSC) during the flood season (13-14 and 16-17, August, 2007), by the means of measured data analysis and the TELEMAC-2D numerical model, this article reveals the spatial distribution characteristics of SSC in the Lingdingyang Esturay:in the longitudinal direction along west channel, SSC decrease first, then increase, and then decrease again from bay head to open sea; laterally, west channel, east channel and the north of the middle flat are higher SSC areas; the maximal center of SSC is located on the northwest of Neilingding Island. The model of longitudinal material transport reveals that the main reasons of net suspended sediment transport are advection, tidal asymmetry and vertical circulation. The effects of tidal current, runoff with sediment transport, solid boundary and topography condition are the main reasons for the 2D distribution characteristics of SSC in the Lingdingyang Estuary.
- Lingdingyang Estuary /
- suspended sediment concentration /
- 2D distribution characteristics /
- mechanism

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