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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。
Based on the observed data of sediment and sediment in the Mudaomen estuary in Hongji and the data of surface sediment in the river bed, the sediment concentration and particle size in different areas at different times and the sediment particle size distribution were analyzed. The statistical analysis methods such as factor analysis and particle size distribution were used, This paper studies the sand exchange process and its dynamic mechanism of suspended sediment and river bed in Modaomen estuary and coastal waters in the recent Hong Kong. The results show that the main power flow in the Shahejie estuarine channel and Cangdao port area is mainly the runoff and tide flow system, and the sand exchange process between the suspended sediment and riverbed sand is weak; The average amount of resuspended sediment accounts for 32% of the measured suspended sediment concentration. The composition of suspended sediment in coastal waters outside the barricade is significantly affected by the relative intensity of runoff and tide, Resuspension of sediment is the main trend, and sediment discharge is dominated by runoff during the low tide, while the suspended sediment transport direction is controlled by the southeast wave and coast flow.