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本文根据大量实测资料着重分析长江河口的混合类型、环流模式及其对悬沙输移的影响。研究表明,长江口的混合类型随洪枯季、大小潮而变,又因地点而异,北支以C型为主,北港、北槽、南槽以B型为主。北港、北槽和南槽在径流、潮流、盐淡水异重流共同作用下,存在上层水流净向海,下层水流在滞流点下游净向陆的河口环流。悬沙输移模式和河口环流模式相似。最大浑浊带、浮泥、航道拦门沙的位置及变化规律与滞流点相一致,其形成和变化与河口环流密切关联。
Based on a large number of measured data, this paper focuses on the analysis of mixing types, circulation patterns and their effects on suspended sediment transport in the Yangtze River Estuary. The results show that the mixing types of the Yangtze Estuary vary with the flood season, the tidal and the tidal range, and vary according to the location. The North Branch is mainly C type, and the North Port, North Slot and South Slot are mainly B type. Under the combined effect of runoff, tidal current and salt-water freshwater, the north port, north bank and south bank have the estuarine circulation in which the upper stream flows to the sea and the lower stream flows to the net downstream of the stagnation point. Suspended sediment transport mode and estuarine circulation mode is similar. The maximum turbid zone, the position of the floating mud and the waterway sand bar and its variation are consistent with the stagnant point, and its formation and change are closely related to the estuarine circulation.