悬浮絮凝体特征及其影响因子的综合作用——以长江口内河槽和口门最大浑浊带为例

发布时间：2018-05-15 11:29

本文选题：悬浮絮凝体 + 影响因子　；参考：《华东师范大学学报(自然科学版)》2017年04期

【摘要】：絮凝对河口细颗粒悬沙运动起着极其重要的作用.为深入探讨长江口悬浮絮凝体的特征及其主要影响因子的综合作用,于2014年10月19—23日(长江口径流量、潮差、风浪均接近多年平均值)利用多种仪器在人类活动干扰较小的南支-北港-口外海滨水域进行了综合现场观测和取样,获得了四个潮流特征时刻(涨急、涨憩、落急、落憩)的悬浮絮凝体粒径、分散粒径(即分散悬沙的原始粒径)、悬沙浓度、体积浓度、流速流向、盐度等数据.利用灰色关联度分析方法分析五大影响因子(悬沙浓度、体积浓度、流速、盐度和分散粒径)对絮凝体粒径和有效密度影响程度.结果表明,在相同体积水体中,口门最大浑浊带测点的絮凝体相对口内河槽测点数量多、粒径小,絮凝体内粘土颗粒少、空隙大、自由水多.在口内河槽,絮凝体粒径主要受悬沙浓度、分散粒径和体积浓度控制,有效密度主要受到分散粒径、悬沙浓度和流速控制;在口门最大浑浊带,絮凝体粒径的主控因子是流速,有效密度主要受到盐度、悬沙浓度控制.
[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.
【作者单位】：华东师范大学河口海岸学国家重点实验室;长江口水文水资源勘测局;国家海洋局第二海洋研究所;
【基金】：科技部重点专项(2016YFA0600901) 国家自然科学基金委-山东省联合基金项目(U1606401)
【分类号】：TV148

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