scholarly journals Spectral Variation and Corresponding Changing Mechanism of Suspended Particulate Material Absorption in Poyang Lake during Flood Periods

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yuandong Wang ◽  
Xibin You ◽  
Lianfang Yu ◽  
Lihong Meng ◽  
Xiangming Xu ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Poyang Lake ◽  
Water Environment ◽  
Deep Understanding ◽  
Particulate Material ◽  
Spectral Variation ◽  
Package Effect ◽  
Suspended Particulate ◽  
Field Samples ◽  
Suspended Particulate Material

Remote sensing accuracy of the dynamic water environment under a changing environment due to climate and anthropogenic impacts should be improved by a deep understanding of the absorption properties pertinent to the water body. Spectral variation of suspended particulate material (SPM) absorption and its changing mechanism during flood periods of Poyang Lake were analyzed in this study. Absorption coefficients were measured and determined by spectrophotometry using the quantitative filter techniques (QFTs) based on field samples from July 12 to September 06, 2017. Two main optical active constituents (OACs) of SPM including nonalgal and phytoplankton algal particulates were quantified and analyzed in detail. The results suggested that, during study periods, Poyang Lake exhibits an overall high level of suspended nonalgal detritus and algal concentration and lower water clarity, showing a strong absorption by total suspended sediments that are closely related with the land-derived nonalgal detritus material which varied significantly with diverse proportions of minerals and organic materials from multiple sources. Due to variations in phytoplankton community pigment composition, concentration, and package effect, there exists a difference between optical absorption capacity on blue (440) and red (675) portions of bands, the former of which had an obvious enhancement due to the increased effect of accessory pigments in suspended phytoplankton particles from July to September. Evidence also presented that the nonlinear dependency of specific phytoplankton particulate absorption on pigment concentration for various trophic statuses in different periods could be unstable due to relative contributions of the package effect and accessory pigments; this could bring uncertainties to the parameterization of optical models and remote sensing algorithms proposed for accurate applications in lake water environment monitoring.

scholarly journals Análise Espaço-Temporal da Pluma de Dispersão dos Sedimentos Dragados do Porto de Maceió, Alagoas

2021 ◽  
pp. 2087-2113
Author(s):  
Anderson Marques Araújo do Nascimento ◽  
Paulo Ricardo Petter Medeiros ◽  
Geovânia Ricardo dos Santos ◽  
Geórgenes Hilário Cavalcante Segundo
Keyword(s):  
Gravimetric Method ◽  
Linear Interpolation ◽  
Particulate Material ◽  
Physical Parameters ◽  
Plot Analysis ◽  
Suspended Particulate ◽  
Suspended Particulate Material ◽  
Sedimentary Dynamics ◽  
Box Plot

The understanding of the sedimentary dynamics is important in the characterization of impacts caused by dredging and this knowledge becomes decisive for their discernment. The aim of this article was to analyze the plume of dispersion of the sediments of the Port of Maceió. The analyzes were carried out in three sampling campaigns, before, during and after the port works, in which the collection points in the dredging and discard areas were plotted. The suspended particulate material (SPM) was analyzed using the gravimetric method and in situ sampling of the parameters turbidity, dissolved oxygen and percentage of saturation, salinity and electrical conductivity with a multiparameter probe and water transparency with Secchi disk. The parameters SPM, turbidity and transparency were analyzed by linear interpolation, while the other variables were subjected to analysis on a polynomial calibration curve. The multiparameters worked were submitted to box plot analysis in order to assess the variance between campaigns. The variation of SPM in the sample campaigns showed dynamic spatial and temporal behavior; The interpolation promoted a better visualization of the physical parameters that directly express the plume of dispersion; The supplementary variables showed trend patterns in relation to the sediment charge; Box plot analysis proved to be pertinently useful for evaluating and interpreting the results in an integrated manner, mainly due to the large number of parameters analyzed; The dredging works had a balanced management between the amount of dredged sediments and their spatial disposition at the discard site when compared to the dredging area.

Distribution and geochemical composition of suspended particulate material in the shallow embayment of northern Thermaikos Gulf, Greece

2017 ◽  
Vol 143 ◽  
pp. 295-310 ◽  
Author(s):  
K. Tsompanoglou ◽  
Ch. Anagnostou ◽  
E. Krasakopoulou ◽  
K. Pagou ◽  
A.P. Karageorgis ◽  
...  
Keyword(s):  
Particulate Material ◽  
Geochemical Composition ◽  
Suspended Particulate ◽  
Suspended Particulate Material

Some Relations of Land Drainage, Nutrients, Particulate Material, and Fish Catch in Two Eastern Canadian Bays

1972 ◽  
Vol 29 (4) ◽  
pp. 357-362 ◽  
Author(s):  
W. H. Sutcliffe Jr.
Keyword(s):  
Particulate Material ◽  
Important Species ◽  
Carbon And Nitrogen ◽  
Land Drainage ◽  
Suspended Particulate ◽  
Suspended Particulate Material ◽  
Fish Catch ◽  
Commercially Important ◽  
Positive Correlations ◽  
Carbon And Nitrogen Content

A year's record of the carbon content of living and of carbon and nitrogen content of nonliving suspended particulate material from St. Margaret's Bay, Nova Scotia, is presented. From considerations of carbon/nitrogen ratios and nutrient data from other sources, the nitrogen budget is briefly considered. The possible importance of land drainage into the bay leads to some positive correlations between runoff and catch of four commercially important species in the Gulf of St. Lawrence.

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