scholarly journals Entrainment of Sediment Particles in Protection Layers

2021 ◽  
Vol 147 (10) ◽  
pp. 04021040
Author(s):  
Xerxes Mandviwalla ◽  
Erik Damgaard Christensen
Keyword(s):  
Sediment Particles

ANALYSIS OF THE MODERN GRAIN-SIZE COMPOSITION VARIABILITY OF THE ANAPA BAY-BAR BEACH SEDIMENTS

2018 ◽  
Author(s):  
В. Крыленко ◽  
V. Krylenko ◽  
Р. Косьян ◽  
R. Kos'yan ◽  
М. Крыленко ◽  
...  
Keyword(s):  
Grain Size ◽  
Bottom Sediments ◽  
Size Structure ◽  
Size Composition ◽  
Potential Danger ◽  
Grain Size Composition ◽  
Beach Sediments ◽  
Sediment Particles ◽  
Sand Material

The results of realized in 2010 field researches of the spatial and time grain-size structure variability of beach and bottom sediments of the bay-bar Anapskaya southern part are presented in this paper. Irretrievable carrying out of sediment particles to depths more than 7 m intensifies with their size decrease to 0,1 mm. As over 70 % bottom and about 60 % beach sediments are presented by fractions less 0,16 mm on bay-bar Anapskaya southern part, namely at this part there is sand material massive carrying out to depth. Potential danger of the investigated site geosystem degradation is revealed.

Organic and Trace Metal Pollution in the Sediments of the Kishon River (Israel) and Possible Influence on the Marine Environment

1993 ◽  
Vol 27 (7-8) ◽  
pp. 439-447 ◽  
Author(s):  
Y. Cohen ◽  
N. Kress ◽  
H. Hornung
Keyword(s):  
Trace Metals ◽  
Marine Environment ◽  
River System ◽  
River Channel ◽  
Disposal Site ◽  
Lower Reach ◽  
Deposition Area ◽  
Long Time ◽  
Water Disposal ◽  
Sediment Particles

The sediments of the lower reach of the Kishon river, its harbors and estuary, sampled in 1989-1991, were highly polluted by trace metals and petroleum derived compounds released by the adjacent industries. The contamination was highest in the sediment deposition area of the Kishon fishing harbor and decreased seaward. River-borne pollution was also evident in Haifa Bay opposite the Kishon estuary. Contaminants trapped in the sediments of the lower Kishon river system can reach the marine environment through bottom transport of sediment particles and also as a result of disposal at sea of dredge spoils from the river channel and harbors. On the basis of the findings of the study, it was recommended to stop the long-time practice of dumping dredge spoils from the Kishon fishing harbor into the relatively clean Haifa Bay and to use instead an offshore deep water disposal site.

scholarly journals Trajectories of coarse granular sediment particles in a simplified centrifugal dredge pump model

2016 ◽  
Vol 8 (11) ◽  
pp. 168781401668014 ◽  
Author(s):  
Guojun Hong ◽  
Qingbo Zhang ◽  
Guoliang Yu
Keyword(s):  
Sediment Particles

scholarly journals Cross-Sectional Information on Pore Structure and Element Distribution of Sediment Particles by SEM and EDS

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Minghong Chen ◽  
Huiming Zhao ◽  
Hongwei Fang ◽  
Yuefeng Zhang
Keyword(s):  
Pore Structure ◽  
Particle Surface ◽  
Element Distribution ◽  
Special Method ◽  
Cross Sectional ◽  
Distribution Maps ◽  
Observation Methods ◽  
Sediment Particles ◽  
Pore Microstructure ◽  
Physical And Chemical

The interaction between pollutants and sediment particles often occurs on the particle surface, so surface properties directly affect surface reaction. The physical and chemical processes occurring on sediment particle surfaces are microscopic processes and as such need to be studied from a microscopic perspective. In this study, field emission scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS) were adopted to observe and analyze the pore structure and element distribution of sediment particles. In particular, a special method of sample preparation was used to achieve the corresponding cross-sectional information of sediment particles. Clear images of a particle profile and pore microstructure were obtained by high-resolution SEM, while element distribution maps of sediment particles were obtained by EDS. The results provide an intuitive understanding of the internal microenvironment and external behavior of sediment particles, in addition to revealing a significant role of pore microstructure in the adsorption and desorption of pollutants. Thus, a combination of different experimental instruments and observation methods can provide real images and information on microscopic pore structure and element distribution of sediment particles. These results should help to improve our understanding of sediment dynamics and its environmental effects.

scholarly journals Observations Within Cavities at the Bed of the Glacier Østerdalsisen, Norway

1979 ◽  
Vol 23 (89) ◽  
pp. 273-281 ◽  
Author(s):  
Wilfred H. Theakstone
Keyword(s):  
Grain Size ◽  
Stress Concentration ◽  
Creep Rate ◽  
Significant Influence ◽  
Ice Formation ◽  
Structural Anisotropy ◽  
Basal Ice ◽  
Anisotropic Structures ◽  
Sediment Particles ◽  
Flow Law

AbstractBasal ice at the glacier Østerdalsisen commonly deforms under stress within cavities at the glacier bed. Some ice subject to rapid strain, however, fails in a brittle manner. The creep-rate of basal ice is influenced by sediment particles within it, and by ice grain-size and structural anisotropy; a flow law for such ice has not been derived experimentally. Near the glacier bed, particles enclosed in ice may migrate as a result of stress concentration, bubbles may be flattened, and anisotropic structures may develop. Recrystallization leads to grain-size changes. Both regelation spicules and layers of regelation ice, generally thin, form within subglacial cavities but their occurrence is limited. Regelation-ice formation has a significant influence on the distribution of rock debris at the ceilings of subglacial cavities.

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