Results 241 to 250 of about 3,735,810 (289)
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Source identification for suspended sediments
Journal of Hydrology, 1980Abstract Studies of suspended sediment in the 170-km 2 River Ystwyth catchment (mid-Wales) for 1973–1975 suggest two complementary methods of identifying their sources. The colour of yielded sediments, and the details of sediment-discharge relationships with respect to time, allow a separation into “channel” and “non-channel” sources.
D.L. Grimshaw, J. Lewin
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Sediments as sources of DDT and PCB
Marine Pollution Bulletin, 1977Abstract Despite major decreases in DDT and PCB emissions over a three year period by the dominant discharger to a coastal marine site, only minor (and very similar) decreases were observed in concentrations of these pollutants in bottom sediments and flatfish from the outfall monitoring zone.
David R. Young +2 more
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Chapter IV. Sediment Sources and Sediment Yields
Journal of the Hydraulics Division, 1970Methods and procedures are analyzed for determining erosion rates from water-borne sediments, along with sediment yield or deposition rates at locations downstream from the erosion source. Emphasis is placed on the erosion types and processes which cause the most engineering problems, either by virtue of the large sediment quantities involved or by the
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Sources and Distribution of Sediments
2006The uplift of rocks above sea level on the Earth’s surface over geological time, produces rock material that can be altered into soils and sediments by weathering processes. Over geological time, a fraction of sediments can be sequestered for storage in the ocean basins—with most of it stored in the coastal margin.
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Sources and Composition of Marine Sediments
1982Marine sediments consist of deposits accumulating below the sea. They show great variety. There is the debris from the wearing down of continents and volcanic mountains, the shells derived from organisms, organic matter, minerals precipitated from seawater, and there are volcanic products such as ash and pumice.
Eugen Seibold, Wolfgang Berger
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The role of sediments as a source of metals in river catchments
Chemosphere, 2012Aquatic sediments are a known source of pollutants, but their impact on the quality of overlying waters is not easily quantified. Sediments are generally considered to behave as a sink for pollutants such as heavy metals in the aquatic environment, frequently acting as a source for their presence in waters, with implications for catchment management ...
Nikolaos Voulvoulis, Ho-Sik Chon
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The dynamic concept of sediment sources
Eos, Transactions American Geophysical Union, 1950Using 200 upland sample areas and 23 valley cross‐sections, a study was made of rates of sediment production and sediment sources from the headwaters of the Sangamon River of Illinois to its mouth. It was found that as the size of drainage area increases, the upland sources of sediment, such as sheet and gully erosion, become less important, while the ...
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Sediment sources, source-to-sink fluxes and sedimentary budgets
Geomorphology, 2013Climate change, human activity and other environmental disturbances can affect Earth surface systems via alteration of vegetation cover, hydrologic regime, permafrost distribution, and glacier fluctuations. For example, Pleistocene temperature drop had profound climatic and geomorphic influences worldwide, including abrupt glacial advance in vast ...
Beylich, Achim A, BRARDINONI, FRANCESCO
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Sediment Fingerprinting to Determine the Source of Suspended Sediment in a Southern Piedmont Stream
Journal of Environmental Quality, 2010Thousands of stream miles in the southern Piedmont region are impaired because of high levels of suspended sediment. It is unclear if the source is upland erosion from agricultural sources or bank erosion of historic sediment deposited in the flood plains between 1830 and 1930 when cotton farming was extensive.
R, Mukundan +4 more
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Phosphorus Sources for Aquatic Weeds: Water or Sediments?
Science, 1980Nine common species of aquatic macrophytes took all their phosphorus from the sediments when grown in situ in both a mesotrophic and a mildly eutrophic bay. Even under hypertrophic conditions, the sediments contributed an average of 72 percent of all the phosphorus taken up during growth.
R, Carignan, J, Kalff
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