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利用长江口的现场观测资料分析河口不同区段表层细颗粒泥沙絮凝特性及其影响因素。结果表明:在河口上段水域,流速对絮凝表现为破坏作用,盐度是“制约”条件,流速和浊度对絮团影响明显,絮团平均粒径约为40.69mm,是分散粒径的4倍左右;口门最大浑浊带水域絮团峰值出现在憩流或者中等流速处,高盐度抑制、低盐度促进絮团生长,小潮时流速影响最明显、大潮时则是盐度,絮团平均粒径小潮为28.54mm、大潮35.17mm,是分散粒径2~3倍左右;北港口外,絮团生长或者破碎频繁,流速表现出促进作用,盐度有抑制作用,盐度对絮团影响最大,絮团平均粒径约为110.36mm,是分散粒径的18倍左右。
Analysis on the Flocculation Characteristics and Influencing Factors of Fine Sediment in Different Estuary Areas Using Field Observation Data in the Yangtze River Estuary. The results show that the velocity of flocculation is destructive in the upper estuary of the estuary, and the salinity is the “constraint” condition. The fl ow rate and turbidity have an obvious influence on the floc. The floc size is about 40.69mm, Of the maximum turbidity zone flocs peak appeared in the open stream or moderate flow rate, high salinity inhibition, low salinity promote floc growth, the impact of flow velocity is most obvious at tidal wave, the tide is salinity, The average size of flocs is 28.54mm, the tide is 35.17mm, which is about 2 ~ 3 times of that of the dispersed particles. The floc growth or crushing is frequent outside the north port, the flow velocity shows a promoting effect, the salinity is inhibited, and the salinity Flocculation greatest impact, the average floc size of about 110.36mm, is about 18 times the dispersed particle size.