scholarly journals Modelling seabed disturbance and sediment mobility on the Canadian Atlantic Shelf

2021 ◽  
Author(s):  
M Z Li ◽  
Y Wu ◽  
C G Hannah ◽  
W A Perrie ◽  
H Shen ◽  
...  
Keyword(s):  
Sediment Mobility

SPATIAL AND TEMPORAL METRICS OF SEDIMENT MOBILITY AT PLUMB BEACH, NEW YORK CITY, 2012-2015

2016 ◽  
Author(s):  
William J. Schmelz ◽  
◽  
Joshua Greenberg ◽  
Katherine Ames ◽  
Andrea Spahn ◽  
...  
Keyword(s):  
New York ◽  
New York City ◽  
York City ◽  
Sediment Mobility

Estimating global shelf sediment mobility due to swell waves

1998 ◽  
Vol 150 (1-4) ◽  
pp. 171-177 ◽  
Author(s):  
Peter T. Harris ◽  
Richard Coleman
Keyword(s):  
Shelf Sediment ◽  
Sediment Mobility

scholarly journals Bedload transport in a steep alpine stream: Assessment of sediment mobility and virtual velocity using the bedload tracking

2018 ◽  
Vol 40 ◽  
pp. 02027
Author(s):  
Riccardo Rainato ◽  
Lorenzo Picco ◽  
Daniele Oss Cazzador ◽  
Luca Mao
Keyword(s):  
Field Studies ◽  
Bedload Transport ◽  
Monitoring Methods ◽  
Fluvial Systems ◽  
Passive Integrated Transponders ◽  
Average Recovery Rate ◽  
Sediment Mobility ◽  
Alpine Stream ◽  
Virtual Velocity ◽  
Term Field

The bedload transport is challenging to analyze in field, consequently, several assumptions about it were made basing on laboratory researches or on short-term field studies. During the last decades several monitoring methods were developed to assess the bedload transport in the fluvial systems. The aim of this work is to investigate the transport of the coarse sediment material in a steep alpine stream, using the bedload tracking. The Rio Cordon is a typical alpine channel, located in the northeast of Italy. It is characterized by a rough streambed with a prevalent boulder-cascade and step pool morphology. Since 2011, 250 clasts equipped with Passive Integrated Transponders (PIT) were installed in the main channel, to analyze their mobility along a reach 320 m long. From November 2012 to August 2015, the transport induced by a range of hydraulic forcing between 0.44 m3 s-1 and 2.10 m3 s-1 was assessed by 10 PIT-surveys. First, the mobility expressed by the tracers was analyzed, observing marked differences in terms of travel distance. Then, the average recovery rate achieved during the tracer inventories (Rr > 70%) permitted to define the threshold discharge for each grain size class analyzed and, then, to assess the virtual velocity experienced by the tracers.

OILED SEDIMENTS IN THE HUMBER ESTUARY FOLLOWING THE SIVAND INCIDENT

1987 ◽  
Vol 1987 (1) ◽  
pp. 419-426 ◽  
Author(s):  
D. I. Little
Keyword(s):  
Biological Effects ◽  
Gas Liquid Chromatography ◽  
Oil Distribution ◽  
Suspended Particulate ◽  
Oil Concentration ◽  
Sediment Mobility ◽  
Oil Penetration ◽  
Spilled Oil ◽  
Good Drainage

ABSTRACT The Sivand oil spill of September 28, 1983, was unusual in that 6,000 t of crude oil were spilled in a highly turbid estuary. This study aimed to contribute to knowledge of spatial and temporal oil distribution and to examine its degradation. The role of suspended particulate matter (SPM) in the fate of oil is discussed, but the study concentrates on stranded oil in two sedimentologically distinct shorelines where ecological and conservation interests are high. The sites were Humberston Fitties, a sand flat, and Blacktoft Sand, a muddy shore in the inner estuary. Methods used were replicate sediment core sampling followed by gas liquid chromatography (GLC) and included ancillary sediment analyses. Soon after the spill, the sand total hydrocarbon (THC) concentration was greater than 50,000 ppm. Over 12 months this concentration decreased to about 3,000 ppm, as expected in coarser sediments. The muds were initially less contaminated (about 2,000 ppm), with only slight reductions in concentration over 12 months. However, there was strong evidence of sediment mobility at this site, and natural cleanup was in fact nearly complete after 9 months; the oil found at 12 months was due to transport of Sivand oil-contaminated muds from nearby reed beds. Good drainage at both sites permitted initial oil penetration. Root macropores at the muddy site encouraged penetration, weathering, and release of oil more easily than if it had been found in the sediment matrix. Sediment mobility at the muddy site contrasted with the firmness of the oiled sandflat, and contrary to vulnerability indices, may imply more rapid oil removal under some circumstances. Water washing was implicated as a major process in oil degradation at the sandy site, but no dramatic sediment turnover or erosion occurred that might have removed the oil. The steep gradients in oil concentration and composition with depth contrasted with the muddy site, where oil penetrated as a coherent mass via root macropores. The study illustrates the importance of sedimentological factors in the fate, effects, and mass balance of spilled oil. Published work on the Sivand has emphasized the effectiveness of cleanup and the lack of biological effects, but may have underestimated the amount of oil trapped in sediments.

Sediment mobility in response to tidal and wind-driven flows along the Belgian inner shelf, southern North Sea

2011 ◽  
Vol 61 (5) ◽  
pp. 611-622 ◽  
Author(s):  
Matthias Baeye ◽  
Michael Fettweis ◽  
George Voulgaris ◽  
Vera Van Lancker
Keyword(s):  
North Sea ◽  
Inner Shelf ◽  
Southern North Sea ◽  
Sediment Mobility

scholarly journals VESSEL WAKE INDUCED SEDIMENT MOBILITY AT EAGLE HARBOR, WASHINGTON, USA

2012 ◽  
Vol 1 (33) ◽  
pp. 58
Author(s):  
David Michalsen ◽  
Zeki Demirbilek ◽  
Okey Nwogu
Keyword(s):  
Puget Sound ◽  
Critical Shear Stress ◽  
Washington State ◽  
Shear Stresses ◽  
Difference Model ◽  
Stability Model ◽  
Sediment Mobility ◽  
Bed Stress ◽  
Passenger Ferry ◽  
Bed Shear Stresses

Eagle Harbor is a small natural harbor located in central Puget Sound on the eastern side of Bainbridge Island, Washington State, USA. Over a period of about 80 years, the harbor was severely contaminated. Approximately 28.3 hectares of the contaminated harbor were capped with dredged and upland sediments from 1993 to 2008. Recent monitoring data has concluded portions of the subtidal cap has eroded and may not be physically stable. Erosion in the vicinity of the car passenger ferry sailing line suggests the cap material may not be of sufficient size to achieve the objectives of providing a physical barrier for chemical isolation. Here, a two-dimensional finite difference model using a coupled Boussinesq-Panel method is used to investigate bed shear stresses on the existing sediment cap to analyze cap stability. Model results indicate the subtidal cap experiences over 100 Pa of bed stress within a 30 meter swath of the ferry sailing line. These bed stresses significantly exceed the critical shear stress of the original cap material indicating the cap is not physically stable.

scholarly journals Modelling reef hydrodynamics and sediment mobility under sea level rise in atoll reef island systems

2020 ◽  
Vol 192 ◽  
pp. 103196
Author(s):  
Holly K. East ◽  
Chris T. Perry ◽  
Eddie P. Beetham ◽  
Paul S. Kench ◽  
Yiqing Liang
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Sediment Mobility
Sign in / Sign up

Export Citation Format

Share Document