Results 261 to 270 of about 45,674 (312)
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Journal of Great Lakes Research, 1978
Abstract 406 samples were taken of the surficial 3 cms of sediment from Lake Superior in 1973. A description of these samples together with the interpretation of continuous echo-sounding records resulted in a description of the surface sediment distribution which is interpreted in the light of the glacial and postglacial evolution of the lake basin ...
R.L. Thomas, C.I. Dell
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Abstract 406 samples were taken of the surficial 3 cms of sediment from Lake Superior in 1973. A description of these samples together with the interpretation of continuous echo-sounding records resulted in a description of the surface sediment distribution which is interpreted in the light of the glacial and postglacial evolution of the lake basin ...
R.L. Thomas, C.I. Dell
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Geochronology of lake sediments
Earth and Planetary Science Letters, 1971Abstract This paper describes partially successful attempts to measure rates of sedimentation in lakes using radiometric techniques. We show that 210 Pb activity precipitated from the atmosphere is ideal for dating lake sediments of ⩽ 100 yr age. In fresh waters, lead is quickly removed from solution on to particulate matter so that unsupported 210
S. Krishnaswamy +3 more
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Lake Sediments: Algal Availability of Lake Burley Griffin Sediment Phosphorus
1980This paper reports an experiment to estimate the amounts of phosphorus in lake sediment that may be available to phytoplankton. It is known that sediment can continue to maintain a polluted lake in an eutrophic condition (Bjork et al., 1972; Bengtsson et al., 1975).
Ronald S. Rosich, Peter Cullen
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Sedimentation and Sediment Resuspension in Lake Ontario
Journal of Great Lakes Research, 1985From March to November 1981, seasonal variations in the weekly sedimentation rates of particulate matter were investigated at an inshore and at an offshore site in Lake Ontario. Sedimentation rates at both sites showed extremely high variability from week to week; minimum to maximum rates varied by a factor of 10 for the offshore site and by a factor ...
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Annual Review of Earth and Planetary Sciences, 1984
processes associated with sedimentation in these lakes is in its infancy. The large lakes of the world are precious resources that provide their nearby inhabitants with abundant fresh water, food, economical transpor tation, and recreation. They also provide additional benefits to the geologist: unique paleoclimatic records, and useful basins in which
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processes associated with sedimentation in these lakes is in its infancy. The large lakes of the world are precious resources that provide their nearby inhabitants with abundant fresh water, food, economical transpor tation, and recreation. They also provide additional benefits to the geologist: unique paleoclimatic records, and useful basins in which
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Sedimentation in an Arctic lake
Journal of Sedimentary Research, 1968Abstract The water of Stanwell-Fletcher lake, on Somerset Island, is essentially isothermal, with melting of ice only in the summer and only along the edges. Sedimentation is very slow because of the short season of inflow and the low organic activity.
J. P. Coakley, B. R. Rust
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Denitrification in Lake Sediments
Environmental Letters, 1973Abstract The capacity of selected calcareous and non-calcareous lake sediments from Wisconsin to reduce NO3-N gas to N2 gas under anaerobic conditions was examined. Although the individual rates of denitrification varied, all lake sediments examined were able to convert approximately 70% of added NO3-N to N2. In one case, approximately 65% of added NO2-
A. N. Macgregor, D. R. Keeney
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Journal of Radioanalytical and Nuclear Chemistry, 1997
For a better understanding of the behaviour of90Sr in aquatic systems, this β-emitter has been determined in the different layers of a lake sediment core which has been previously dated using the well established210Pb dating method. For this, a radiochemical technique has been developed for the isolation of strontium from the sediment samples and for ...
G. Manjón +2 more
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For a better understanding of the behaviour of90Sr in aquatic systems, this β-emitter has been determined in the different layers of a lake sediment core which has been previously dated using the well established210Pb dating method. For this, a radiochemical technique has been developed for the isolation of strontium from the sediment samples and for ...
G. Manjón +2 more
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Lake circulation and sediment transport in Lake Myvatn
Aquatic Ecology, 2004Lake circulation and sediment transport in Lake Myvatn have been calculated using AQUASEA, a numerical model developed by Vatnaskil Consulting Engineers. The goal of the modelling was to calculate changes in sediment transport within the lake due to changes in lake bathymetry caused by diatomite mining. The model uses the Galerkin finite element method
Snorri Páll Kjaran +2 more
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2007
Varved or annually laminated lake sediments offer an incremental dating technique that also provides high-resolution climatic and environmental data and information about related forcing mechanisms. The first definition of varves by De Geer (1912)was restricted to rhythmically deposited proglacial clays.
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Varved or annually laminated lake sediments offer an incremental dating technique that also provides high-resolution climatic and environmental data and information about related forcing mechanisms. The first definition of varves by De Geer (1912)was restricted to rhythmically deposited proglacial clays.
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