伶仃洋洪季悬沙平面分布特征及成因探讨

发布时间：2019-05-27 15:45

【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。
[Abstract]:Based on the field observation data of tidal current and sediment in 2007 flood season (August) in Lingdingyang Estuary, the plane distribution characteristics of suspended sediment concentration are analyzed by analyzing the measured data combined with two-dimensional sediment numerical model. The results show that the suspended sediment concentration decreases at first and then increases to the sea along the west trough from the top Humen to the mouth of Lingdingyang Bay, while the west trough is the largest, the east trough and the middle beach are the second, and the concentration of suspended sediment decreases longitudinally from the top Humen to the mouth of Lingdingyang Bay. The northwest side of Neilingding Island is the center of high sediment concentration. The analysis of the longitudinal transport mechanism of suspended sediment shows that the main contribution items of sediment transport in Lingdingyang flood season are advection to the sea, tidal capture and vertical circulation to land sediment transport, among which the latter two contribute greatly near Neilingding Island. Tidal current, runoff sediment, runoff intensity comparison and topographic boundary action are the main causes of plane distribution difference of suspended sand field.
【作者单位】：中山大学海洋科学学院近岸海洋科学与技术研究中心;中山大学环境科学与工程学院;
【基金】：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) 水利公益性行业科研专项经费项目“珠江河口咸情变化及抑咸对策研究”(201501010)
【分类号】：TV148

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