Observations of distribution and flocculation of suspended particulate matter in the Minjiang River Estuary, China
Observations of distribution and flocculation of suspended particulate matter in the Minjiang River Estuary, China
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闽江口悬浮颗粒物分布及絮凝观测
DOI：
10.1016/j.margeo.2017.03.006
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发表时间：
2017-05
期刊：
影响因子：
2.9
通讯作者：
Yonghang Xu
中科院分区：
文献类型：
--
作者：
Dongyi Li;Yunhai Li;Yonghang Xu
本研究描述了闽江口周边海域悬浮颗粒物（SPM）的分布格局及其影响因素。进一步，我们研究了研究区SPM的絮凝过程及其潜在机制。利用2009年8月实测的水温、盐度、浊度、荧光和粒度分布数据实现了目标。受闽江水体稀释影响，河口水柱结构分层明显，温跃层和盐跃层明显。地表水的浊度相对较低（SSC < 5 mg/l），但足以在近底栖区形成霞石层（SSC > 15 mg/l）。地表水中的荧光较高（高达 10 µl/l），而下层水层的荧光明显较低且更均匀。上水层中SPM的总体积浓度和粒径均显着高于下水层。 SPM原位粒径频率分布在不同水层中变化明显，而分散颗粒较细，频率分布差异不大。地表水体和底栖水体的SPM平均有效密度一般<600 kg/m3，底栖水层略高于地表水层，中层水层增加显着。总体积浓度和水体浊度分布趋势的显着差异受SPM粒径分布的控制。 SPM的浓度分布主要受来源、重悬浮和温跃层等因素的影响。研究区絮凝现象广泛存在，不同水层SPM的絮凝机理存在差异。在上层水层，强烈的生物活性促进了稳定大絮凝体的形成。在底栖水层中，生物活性有限，沉积物颗粒的絮凝主要是由无机颗粒的物理化学吸引力引起的，水动力条件和高沉降速度也不利于大絮凝体的形成。
In this study, we described the distribution pattern of suspended particulate matter (SPM) and its influencing factors in the waters around the Minjiang River Estuary. Further, we investigated the flocculation process of SPM and its underlying mechanism in the study area. The objectives were achieved using water temperature, salinity, turbidity, fluorescence and particle size distribution of SPM data measured in August 2009. As influenced by dilution from the Minjiang River water, the water column structure was significantly stratified in the estuary, with an obvious thermocline and halocline. The turbidity was relatively low in the surface water (SSC < 5 mg/l) but sufficient to form nepheloid layer in the near-benthic (SSC > 15 mg/l). Fluorescence was high (up to 10 μl/l) in the surface water, which was markedly lower and more uniform in the lower water layer. The total volume concentration and particle size of the SPM in the upper water layer were significantly higher than those of the lower water layer. The in-situ particle size frequency distribution of SPM markedly changed in the different water layers, whereas the dispersed particles were fine, with little difference in frequency distribution. The mean effective density of SPM was generally < 600 kg/m3in the surface and benthic water, and the values were slightly higher in the benthic water layer than in the surface water layer, with a significant increase in the middle water layer. The significant differences between the distribution trends of the total volume concentration and water turbidity were controlled by the size distribution of SPM. The concentration distribution of SPM was mainly influenced by source, re-suspension and thermocline, among other factors. Flocs widely occurred in the study area, and the flocculation mechanism of SPM varied in the different water layers. In the upper water layer, intense biological activity promoted the formation of stable macroflocs. In the benthic water layer, the biological activity was limited, the flocculation of sediment particles was mainly caused by physico-chemical attraction of inorganic particles, and the hydrodynamic conditions and high settling velocity were also unfavourable to the formation of macroflocs.
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DOI：
10.1680/doem.28647
发表时间：
2000
期刊：
--
影响因子：
--
作者：
R. Whitehouse
通讯作者：
R. Whitehouse
影响因子：
2.9
作者：
Chang, Tae Soo;Joerdel, Olaf;Bartholomae, Alexander
通讯作者：
Bartholomae, Alexander
DOI：
10.1016/0077-7579(93)90001-9
发表时间：
1993-07-01
期刊：
NETHERLANDS JOURNAL OF SEA RESEARCH
影响因子：
--
作者：
EISMA, D;LI, A
通讯作者：
LI, A
影响因子：
3.6
作者：
Braithwaite, K. M.;Bowers, D. G.;Graham, G. W.
通讯作者：
Graham, G. W.
影响因子：
2
作者：
T. Milligan;P. Hill
通讯作者：
T. Milligan;P. Hill