本文選題：細(xì)顆粒泥沙　切入點(diǎn)：絮凝　出處：《泥沙研究》2017年02期

【摘要】：利用長(zhǎng)江口的現(xiàn)場(chǎng)觀測(cè)資料分析河口不同區(qū)段表層細(xì)顆粒泥沙絮凝特性及其影響因素。結(jié)果表明:在河口上段水域,流速對(duì)絮凝表現(xiàn)為破壞作用,鹽度是"制約"條件,流速和濁度對(duì)絮團(tuán)影響明顯,絮團(tuán)平均粒徑約為40.69mm,是分散粒徑的4倍左右;口門最大渾濁帶水域絮團(tuán)峰值出現(xiàn)在憩流或者中等流速處,高鹽度抑制、低鹽度促進(jìn)絮團(tuán)生長(zhǎng),小潮時(shí)流速影響最明顯、大潮時(shí)則是鹽度,絮團(tuán)平均粒徑小潮為28.54mm、大潮35.17mm,是分散粒徑2~3倍左右;北港口外,絮團(tuán)生長(zhǎng)或者破碎頻繁,流速表現(xiàn)出促進(jìn)作用,鹽度有抑制作用,鹽度對(duì)絮團(tuán)影響最大,絮團(tuán)平均粒徑約為110.36mm,是分散粒徑的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.
【作者單位】： 華東師范大學(xué)河口海岸學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41376098;41130856)
【分類號(hào)】：TV148
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本文編號(hào)：1676974