长江口不同河段表层细颗粒泥沙絮凝特性

发布时间：2018-03-28 15:48

  本文选题：细颗粒泥沙　切入点：絮凝　出处：《泥沙研究》2017年02期

【摘要】：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。
[Abstract]:The flocculation characteristics of fine sediment in different sections of the estuary and its influencing factors are analyzed by using the field observation data of the Changjiang Estuary. The results show that the velocity of flow in the upper section of the estuary is destructive to the flocculation, and the salinity is a "constraint" condition. The average particle size of flocs was about 40.69 mm, which was about 4 times of the dispersed particle size, and the peak value of flocs in the maximum turbid zone appeared at the open flow or the middle velocity, the high salinity inhibited the flocs, and the low salinity promoted the floc growth, the average particle size of the flocs was 40.69 mm, which was about 4 times of the dispersed particle size. The effect of flow velocity was most obvious at low tide, and salinity at high tide. The average particle size of flocs was 28.54 mm and 35.17 mm, which was about 3 times that of dispersed particle size. Outside the north port, flocs grew or broken frequently, and the velocity of flow showed a promoting effect, and the salinity was inhibited. The average particle size of flocs is about 110.36 mm, which is about 18 times of dispersed particle size.
【作者单位】： 华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金项目(41376098;41130856)
【分类号】：TV148
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本文编号：1676974