本文選題：懸浮絮凝體 + 影響因子　； 參考：《華東師范大學學報(自然科學版)》2017年04期

【摘要】：絮凝對河口細顆粒懸沙運動起著極其重要的作用.為深入探討長江口懸浮絮凝體的特征及其主要影響因子的綜合作用,于2014年10月19—23日(長江口徑流量、潮差、風浪均接近多年平均值)利用多種儀器在人類活動干擾較小的南支-北港-口外海濱水域進行了綜合現(xiàn)場觀測和取樣,獲得了四個潮流特征時刻(漲急、漲憩、落急、落憩)的懸浮絮凝體粒徑、分散粒徑(即分散懸沙的原始粒徑)、懸沙濃度、體積濃度、流速流向、鹽度等數(shù)據(jù).利用灰色關聯(lián)度分析方法分析五大影響因子(懸沙濃度、體積濃度、流速、鹽度和分散粒徑)對絮凝體粒徑和有效密度影響程度.結果表明,在相同體積水體中,口門最大渾濁帶測點的絮凝體相對口內(nèi)河槽測點數(shù)量多、粒徑小,絮凝體內(nèi)粘土顆粒少、空隙大、自由水多.在口內(nèi)河槽,絮凝體粒徑主要受懸沙濃度、分散粒徑和體積濃度控制,有效密度主要受到分散粒徑、懸沙濃度和流速控制;在口門最大渾濁帶,絮凝體粒徑的主控因子是流速,有效密度主要受到鹽度、懸沙濃度控制.
[Abstract]:Flocculation plays an extremely important role in the movement of fine suspended sediment in estuaries. In order to probe into the characteristics of suspended flocculants and the comprehensive action of main influencing factors in the Changjiang Estuary, the runoff and tidal range of the Changjiang Estuary were observed from October 19-23, 2014. The wind and waves are close to the average value of many years) using various instruments to conduct comprehensive field observation and sampling in the waters off the coast of the southern branch, north port and outside the mouth where human activities are less interfered with, and four characteristic moments of tidal current (rising, resting, falling, falling) have been obtained. The suspended flocculant particle size, dispersion particle size (I. E. the original particle size of suspended sediment, suspended sediment concentration, volume concentration, flow velocity, salinity and so on). The influence of five factors (suspended sediment concentration, volume concentration, velocity of flow, salinity and dispersed particle size) on the particle size and effective density of flocculants was analyzed by grey correlation analysis. The results show that, in the same volume of water, the number of measured points in the channel is large, the particle size is small, the clay particles in the flocculation body are less, the void is large, and the free water is much. In the channel, the particle size of flocculants is controlled by suspended sediment concentration, dispersion particle size and volume concentration, and the effective density is controlled by dispersion particle size, suspended sediment concentration and velocity of flow. The effective density is mainly controlled by salinity and suspended sediment concentration.
【作者單位】： 華東師范大學河口海岸學國家重點實驗室;長江口水文水資源勘測局;國家海洋局第二海洋研究所;
【基金】：科技部重點專項(2016YFA0600901) 國家自然科學基金委-山東省聯(lián)合基金項目(U1606401)
【分類號】：TV148

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