Provenance of Baker River sediments (Chile, 48°S): Implications for the identification of flood deposits in fjord sediments

2021 ◽  
Author(s):  
Dawei Liu ◽  
Sebastien Bertrand ◽  
Elke Vandekerkhove ◽  
Virginie Renson
Keyword(s):  
River Sediments ◽  
Flood Deposits ◽  
Fjord Sediments

Seasonal variations in the origin of river sediments (Baker River, Chile): A pre-requisite for climate and hydrological reconstructions

2021 ◽  
Author(s):  
Benjamin Amann ◽  
Sebastien Bertrand ◽  
Camila Alvarez Garreton ◽  
Brian Reid
Keyword(s):  
River Sediments ◽  
Winter Season ◽  
Suspended Sediments ◽  
Particle Size Distributions ◽  
Rainfall Events ◽  
Hydrological Variability ◽  
Temporal Study ◽  
Chilean Patagonia ◽  
Annual Discharge ◽  
Fjord Sediments

<p></p><div> <div> <div> </div> <div><img>Fjord sediments are increasingly recognized as high-resolution recorders of past climate and hydrological variability. Using them as such, however, requires a comprehensive understanding of the variables that affect their properties and accumulation rates. Here, we conduct a spatial and temporal study of sediment samples collected at the head of Martínez Channel (Chilean Patagonia, 48°S), to understand how the fjord’s sediments register changes in the hydrodynamics of Baker River, Chile's largest river in terms of mean annual discharge. We apply end-member modeling to particle-size distributions of: (i) river suspended sediments, (ii) surface sediments collected along a proximal-distal transect at the fjord head, and (iii) fjord sediments collected in a sequential sediment trap at 15-day resolution during two consecutive years. Results show that the river suspended sediments and fjord sediments are consistently composed of two grain-size subpopulations. The finest end member (EM<sub>1</sub>; mode 4.03 μm) reflects the meltwater contribution, which dominates in all but the winter season. The coarser end member (EM<sub>2</sub>; mode 18.7 μm) dominates in winter, when the meltwater contribution is reduced, and is associated to rainfall events. We propose that log(EM<sub>1</sub>/EM<sub>2</sub>) can be used to reconstruct temperature in the lower Baker River watershed (r = 0.81, p < 0.001). We also show that the fluxes of EM<sub>1</sub> and EM<sub>2</sub> provide quantitative estimates of baseflow (r = 0.82, p < 0.001) and quickflow (r = 0.90, p < 0.001), respectively. These results support the use of fjord sediments for quantitative reconstructions of climate and hydrological changes in glacierized watersheds.</div> </div> </div>

Distribution of anthropogenic mercury in French Guyana river sediments downstream from gold mining sites

2003 ◽  
Vol 107 ◽  
pp. 1263-1266 ◽  
Author(s):  
L. Spadini ◽  
L. Charlet
Keyword(s):  
Gold Mining ◽  
River Sediments ◽  
Mining Sites ◽  
French Guyana

An in Situ Electron Microscope Study of Cellulolytic Bacteria in River Sediments

1972 ◽  
Vol 7 (1) ◽  
pp. 66-70
Author(s):  
G.G. Leppard ◽  
M. Gochnauer ◽  
D.J. Kushner
Keyword(s):  
Electron Microscope ◽  
Microscope Study ◽  
Electron Microscope Study ◽  
River Sediments ◽  
Cellulolytic Bacteria

Distribution of Mercury in Lake St. Clair and the St. Clair River Sediments

1989 ◽  
Vol 24 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Alena Mudroch ◽  
K. Hill
Keyword(s):  
Organic Matter ◽  
Sediment Cores ◽  
River Sediments ◽  
Size Fraction ◽  
Mineralogical Composition ◽  
Recent Sediment ◽  
Geochemical Composition ◽  
Visual Appearance ◽  
Decaying Wood ◽  
Relationship Of

Abstract Sediment cores were collected in Lake St. Clair in 1985 and in the St. Clair River in 1986 to investigate the horizontal and vertical distribution and association of Hg in the sediments. A layer of recent sediment up to about 35 cm thick was differentiated by the geochemical composition and visual appearance from the underlying glacial-lacustrine deposits. The concentration of Hg in the surficial sediments in Lake St. Clair was lower in 1985 (<0.025 to 1.200 µg/g) than that found in 1974 (<0.20 to 3.00 µg/g). Up to 8.30 µg/g of Hg were found in the sediments collected from the nearshore area at Sarnia, Ontario, in the St. Clair River in 1986. The concentrations of Hg ranged from 5.05 to 16.00 µg/g in different sand-sized fractions (0.063 to 0.350 mm) of the sediment. The concentration of Hg was 17.80 µg/g in the silt-clay size fraction (<0.063 mm). No relationship was found between the concentration of organic matter and Hg, and the concentration of silica and Hg in the St. Clair River sediments. The results indicated a relationship of Hg with particles of different mineralogical composition. Up to 3.72 µg/g Hg was found in the surface sediment in Chenal Ecarte. The greatest concentration of Hg (13.15 µg/g) existed in the 0.350 mm particle size fraction, which consisted mainly of small pieces of decaying wood. A good relationship was found between the concentration of Hg and organic matter in the sediment at this area.

scholarly journals Modeling of dense well block point bar architecture based on geological vector information: A case study of the third member of Quantou Formation in Songliao Basin

2021 ◽  
Vol 13 (1) ◽  
pp. 39-48
Author(s):  
Chao Luo ◽  
Ailin Jia ◽  
Jianlin Guo ◽  
Wei Liu ◽  
Nanxin Yin ◽  
...  
Keyword(s):  
River Sediments ◽  
Three Dimensional ◽  
Songliao Basin ◽  
Point Bar ◽  
Meandering River ◽  
Architecture Model ◽  
The Third ◽  
Continuous Convergence ◽  
Vector Information ◽  
Architecture Modeling

Abstract Although stochastic modeling methods can achieve multiple implementations of sedimentary microfacies model in dense well blocks, it is difficult to realize continuous convergence of well spacing. Taking the small high-sinuosity meandering river sediments of the third member of Quantou Formation in Songliao Basin as an example, a deterministic modeling method based on geological vector information was explored in this article. Quantitative geological characteristics of point bar sediments were analyzed by field outcrops, modern sediments, and dense well block anatomy. The lateral extension distance, length, and spacing parameters of the point bar were used to quantitatively characterize the thickness, dip angle, and frequency of the lateral layer. In addition, the three-dimensional architecture modeling of the point bar was carried out in the study. The established three-dimensional architecture model of well X24-1 had continuous convergence near all wells, which conformed to the geological knowledge of small high-sinuosity meandering river, and verified the reliability of this method in the process of geological modeling in dense well blocks.

Effects of seasonal variation and resuspension on microplastics in river sediments

2021 ◽  
pp. 117403
Author(s):  
Feiyang Xia ◽  
Quanwei Yao ◽  
Jun Zhang ◽  
Dunqiu Wang
Keyword(s):  
Seasonal Variation ◽  
River Sediments

High mobilization of phosphorus in black-odor river sediments with the increase of temperature

2021 ◽  
Vol 775 ◽  
pp. 145595
Author(s):  
Ming Kong ◽  
Tianlun Han ◽  
Musong Chen ◽  
Donghua Zhao ◽  
Jianying Chao ◽  
...  
Keyword(s):  
River Sediments

Modern isotopic signatures of Plata River sediments and changes in sediment supply to the western subtropical South Atlantic during the last 30 kyr

2021 ◽  
Vol 259 ◽  
pp. 106910
Author(s):  
Natalie Höppner ◽  
Cristiano M. Chiessi ◽  
Friedrich Lucassen ◽  
Karina Zavala ◽  
Raúl A. Becchio ◽  
...  
Keyword(s):  
River Sediments ◽  
South Atlantic ◽  
Sediment Supply ◽  
Isotopic Signatures

Ecological and probabilistic human health risk assessment of heavy metal(loid)s in river sediments affected by mining activities in Ecuador

2021 ◽  
Author(s):  
Samantha Jiménez-Oyola ◽  
María-Jesús García-Martínez ◽  
Marcelo F. Ortega ◽  
Eduardo Chavez ◽  
Paola Romero ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Heavy Metal ◽  
Health Risk ◽  
Human Health ◽  
Health Risk Assessment ◽  
River Sediments ◽  
Human Health Risk ◽  
Human Health Risk Assessment ◽  
Mining Activities
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