珠江磨刀门河口洪季悬沙与沉积物颗粒度分布及交换过程

发布时间：2018-06-11 11:50

本文选题：珠江磨刀门河口 + 悬沙与河床沙交换　；参考：《泥沙研究》2017年02期

【摘要】：基于洪季磨刀门河口实测水沙观测资料和河床表层沉积物数据,通过对不同区域不同时刻悬沙浓度和粒度、沉积物粒径组成分析,运用因子分析和粒度谱等统计计算方法,重点研究近期洪季磨刀门河口及滨海水域悬沙与河床沙交换过程及其动力机制。结果表明:磨刀门河口拦门沙内河道及汊道口区域的动力以径流为主的涨落潮流流系,悬沙与河床沙交换过程较弱;拦门沙浅滩区域泥沙运动表现为"波浪掀沙,潮流输沙"特性,再悬浮泥沙平均量占实测悬沙浓度的32%;拦门沙外滨海水域悬沙组成受径流与潮汐相对强度影响显著,构成上大潮时以再悬浮泥沙为主,小潮时则以径流下泄悬沙沉积为主,而悬沙输运方向受到东南向波浪和沿岸流控制。
[Abstract]:Based on the observed water and sediment data and the surface sediment data of the river bed in flood season, the concentration and particle size of suspended sediment at different times in different regions and the composition of sediment particle size were analyzed, and the statistical calculation methods such as factor analysis and particle size spectrum were used. The exchange process and dynamic mechanism of suspended sediment and riverbed sediment in Modagaomen estuary and coastal waters during the recent flood season were studied. The results show that in the river channel and inlet area of Modagaomen Estuary, the flow is dominated by runoff, and the exchange process between suspended sediment and riverbed sediment is weak, and the sediment movement in the shoal area of Modagaomen estuary is characterized by "wave sand-lift". The characteristics of tidal current transport are that the average amount of resuspended sediment accounts for 32 of the measured suspended sediment concentration, and the composition of suspended sediment in coastal waters outside the bar is significantly affected by the relative strength of runoff and tide, and the resuspended sediment is the main component of the upper spring tide. In the low tide, the sediment is mainly released from runoff, and the direction of suspended sediment transport is controlled by the southeast wave and coastal current.
【作者单位】：华东师范大学河口海岸学国家重点实验室;国家海洋局第三海洋研究所;福建海洋研究所;
【基金】：国家自然科学基金项目(51479074)
【分类号】：TV148

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