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Topic: Sediment


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In the News (Sat 20 Apr 19)

  
  Sediment - Wikipedia, the free encyclopedia
Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid.
Deposited sediments are the source of sedimentary rocks, which can contain fossils of the inhabitants of the body of water that were, upon death, covered by accumulating sediment.
One other depositional environment which is a mixture of fluvial and marine is the turbidite system, which is a major source of sediment to the deep sedimentary and abyssal basins as well as the deep oceanic trenches.
en.wikipedia.org /wiki/Sediment   (944 words)

  
 Water Resource Characterization DSS - Sediment
Sediments are classified into four broad categories, according to their origin in relation to the basin of water in which they are deposited: extrabasinal, carbonaceous, pyroclastic, and intrabasinal.
Sediment introduced into surface water is either deposited on the bed of the stream or lake or suspended in the water column (suspended load).
Sediment may also be eroded from stream banks during high flows or resuspended from the substrate by changes of speed or direction of the water current.
www.water.ncsu.edu /watershedss/info/sediment.html   (2198 words)

  
 USGS Suspended-Sediment   (Site not responding. Last check: 2007-10-22)
These sediment loads, which are averages as of 1980, reflect a number of artificial influences, not the least of which is the interruption if the down-river flow if sediment by dams and reservoirs.
Sediment concentrations are larger in south-central Alaska, where glaciers erode the mountain slopes and glacial melt-waters carry large sediment loads, but these concentrations still are not as large as those in the arid and semiarid parts of the western conterminous United States.
The sediment discharges of the Mississippi River, the Rio Grande, and the Colorado River have diminished by dams and reservoirs.
co.water.usgs.gov /sediment/conc.frame.html   (650 words)

  
 Assessing Sediment Quality at Manufactured Gas Plant Sites
Initial sediment mapping and sediment observation and analysis from the initial investigation are principal ingredients in the design of a sampling plan for the detailed investigation.
Where sediments or contaminants are quite deep (e.g, greater than about 3 feet), drilling or coring equipment mounted on a suitable sampling platform may be needed to develop cores of the entire leng7th of contaminated sediment.
Sediment samples identified for chemical and physical analysis should be analyzed for the pollutants of concern based on the results of the initial investigation.
www.dnr.state.wi.us /org/water/wm/wqs/sediment/assessment/mgp/subdocs/6.html   (1800 words)

  
 Erosion Control -- A Review of Sediment Control Measures
Sediment control measures and equipment can be grouped into three basic categories: gravity-based settling systems, passive filtration systems, and polymer treatment systems.
Experience has shown that it is cheaper to keep the sediments in their original place than it is to remove them from the stormwater runoff.
Sediment levels in stormwater runoff are coming under increased scrutiny all across the country.
www.forester.net /ec_9911_review_sediment.html   (3399 words)

  
 CD Baby: SEDIMENT: Sediment
Sediment, in its earliest stages, was formed three years ago when four friends decided that they were bored, so they would create a band.
Sediment increased to a five man band and the group quickly learned enough covers to start playing at parties.
Sediment was back to a four man band, but the guys quickly found a new lead singer.
www.cdbaby.com /cd/sediment   (449 words)

  
 Serving Wine
ometimes, a natural wine sediment may be deposited in a bottle of an older wine as a result of aging.
The sediment consists of natural wine solids; it is harmless and does not affect the quality of the wine.
Sediment is more likely to occur in an older red table wine.
www.beveragebusiness.com /bbcontent/html/wineserv.html   (1175 words)

  
 NRDC: New Orleans Area Environmental Quality Test Results - Sediment
In the short-term, residents and workers may be exposed to toxic materials by inhaling dust from sediment they are trying to clean up -- and that is blowing around the city -- or getting it on their hands or in their eyes or mouths.
Other independent sediment testing in New Orleans was conducted by the Louisiana Environmental Action Network (LEAN), which collected five sediment samples in Bywater, Little Woods and St. Bernard Parish on September 16, 2005, and the Louisiana Bucket Brigade, which collected 14 samples on September 19 and September 29, 2005, in St. Bernard Parish.
Sediment is potentially contaminated in all flooded areas, so this advice applies to people re-entering any neighborhood that was flooded.
www.nrdc.org /health/effects/katrinadata/sediment.asp   (2394 words)

  
 Summary of Sediment Testing from September 10 — November 27, 2005 | Response to 2005 Hurricanes | US EPA
Sediment, for the purposes of the hurricane response sampling effort, is being defined as residuals deposited by receding flood waters which may include historical sediment from nearby water bodies, soil from yards, road and construction debris, and other material.
Sediment, for the purposes of the hurricane response sampling effort, is being defined as residuals deposited by receding flood waters that may include historical sediment from nearby water bodies, soil from yards, road and construction debris, and other material.
Sediments of sufficient depth were found at 14 locations, and were re-sampled to determine current conditions.
www.epa.gov /katrina/testresults/sediments/index.html   (3944 words)

  
 Glossary of Coastal Terminology: S-T   (Site not responding. Last check: 2007-10-22)
SEDIMENT: (1) Loose, fragments of ROCKS, MINERALS or organic material which are transported from their source for varying distances and deposited by air, wind, ice and water.
SEDIMENT SINK: A point or area at which beach material is irretrievably lost from a coastal cell, such as an ESTUARY, or a deep CHANNEL in the seabed.
The term is applied (a) to sediments formed and deposited on land (e.g., soils, SAND DUNES) and (b) to material derived from the land when mixed in with purely marine material (e.g., SAND or CLAY in a shelly limestone).
www.ecy.wa.gov /programs/sea/swces/products/publications/glossary/words/s_t.htm   (4578 words)

  
 Erosion and sediment
The mechanisms by which coral responds to sediment stress are discussed within the context of their effect on individual corals and on community and population dynamics.
Thus, sediment not only disrupts feeding, but also extracts a high cost in energy through the process of cleaning their cilia, energy which otherwise could be used for food capture, growth, skeletal repair or reproduction (Richmond, 1993; Peters and Pilson, 1985; Dodge and Vaisnys, 1977).
Studies have shown that damage from sediments may be minimal as long as adequate nutrients, from either internal (zooxanthellae) or external (zooplankton, particulates) sources, are available to the coral animal to meet the additional energy expenditures required to rid themselves of sediment (Peters and Pilson, 1985).
www.yale.edu /roatan/soil.htm   (2990 words)

  
 Contaminated Sediment
Contaminated sediment is a long-standing problem in lakes and rivers, and contributes to many forms of environmental degradation.
In cases where sediment remediation was undertaken as a result of regulatory action, the projects were designed to remove the worst masses of contaminants to reduce environmental risks.
This facility is currently used for the disposal of sediments dredged from the deep draft navigation channels in the Detroit and Rouge Rivers, as well as disposal of sediments dredged from marina operators and other similar permittees.
www.iaglr.org /scipolicy/issues/contamseds.php   (884 words)

  
 LRD - Sediment Management
Sediments are soils that are eroded from land surfaces, washed off streets and carried into streams and rivers where they eventually settle to the bottom.
Sediment transport models are a tool for prioritizing areas within a watershed that are contributing a large portion of the sediment load, and for comparing the efficiency of conservation and source control options.
Implementing conservation measures and non-point source control is not easy, especially when the sources of the sediments are in areas of the watershed that are far removed from the portion of the waterway that is feeling the impact of excessive sediments or sediment contamination.
www.lrd.usace.army.mil /navigation/glnavigation/sedimentmanagement   (909 words)

  
 Erosion and Sediment Control Program   (Site not responding. Last check: 2007-10-22)
While sediment comes from several sources including eroding stream banks, of particular concern is the amount of sediment escaping from construction sites.
Sediment is the term used to describe soil that has moved from one place to another.
Nutrients such as nitrogen and phosphorous that are attached to the sediment trigger algae blooms in ponds and lakes.
www.fairfaxcounty.gov /nvswcd/newsletter/sediment.htm   (746 words)

  
 Sediment   (Site not responding. Last check: 2007-10-22)
U.S. EPA estimates 6% - 12% of underlying sediment in the United States is sufficiently contaminated to cause significant lethality to benthic organisms.
Sediment contamination exists in every region and state in the country and affects streams, lakes, harbors, nearshore areas and oceans.
Sediment monitoring is usually conducted in the fall when stream levels are lowest.
www.water.ky.gov /sw/swmonitor/monitoring/sediment   (549 words)

  
 Sediment Resuspension by Bottom Fishing Gear
Based solely on the decline in sediment resuspension frequency with increasing depth off the shelf (Figure 2), one would expect a mean transport of sediment from the outer shelf to the slope.
From a sediment dynamics viewpoint, the most fundamental issues requiring study are the effects of trawling on suspended sediment load and sediment transport.
Quantifying these effects requires determining the rate at which trawls resuspend sediment (i.e., the mass of sediment put into suspension per unit track length), the height of the sediment plumes generated by trawling and the time required for these to settle.
www.fishingnj.org /artchurchill.htm   (1744 words)

  
 Sediment   (Site not responding. Last check: 2007-10-22)
Bed load, is the term for sediment which slides or rolls along the bottom of the channel due to the velocity of the flowing water.
In general, however, the determination of the flow of suspended sediment particles, and the location and rate of their deposition, is sufficient information for the engineer to control the sediment loading and design appropriate facilities for their removal.
The term sediment load is used to denote the sediment transport rate, usually expressed as metric tons per day, kilograms per hour or other convenient and appropriate unit of measure.
jan.ucc.nau.edu /~dmh3/egr499/class/erosion/sediment/lesson3-3-1.html   (1144 words)

  
 Spatial Analysis and Decision Assistance Software Ecological Sediment Benchmarks   (Site not responding. Last check: 2007-10-22)
SADA allows for sediment ecological benchmark retrieval and provides ratios of contaminant concentrations to benchmark values.
Protocol for the derivation of Canadian sediment quality guidelines for the protection of aquatic life.
Calculation and Evaluation of Sediment Effect Concentrations for the Amphipod Hyallela azteca and the Midge Chironomus riparius.
www.tiem.utk.edu /~sada/sediment_benchmarks.html   (496 words)

  
 SOFIA - Sediment Properties and Transport Processes in Florida Bay - Proposal 1998
Sediment resuspension is inherently tied to the issues prompting restoration efforts; resuspension of sediments is the main cause of increased turbidity, decreased light due to suspended sediments may adversely effect seagrass growth, and nutrients stored within the sediments and released during resuspension events may induce algal blooms.
This project proposes to examine the controls on sediment resuspension in Florida Bay, quantify its occurrence on an annual basis, and provide the overall understanding and information which is needed to incorporate sediment resuspension and transport into circulation and water quality models.
Consensus among consulting experts is that sediment resuspension must be incorporated into a developing water quality model and if possible, sediment transport should be added to the circulation model being constructed.
sofia.usgs.gov /proposals/1998/sedtransp98.html   (2192 words)

  
 Sediment Chemistry
Determine the chemical character of sediments in waters of the state, and whether sediment contaminant levels are changing over time.
The sediment chemistry element consists of two components that, in combination, provide data necessary to achieve these objectives.
Sediment samples collected as part of the watershed surveys are analyzed for a variety of parameters, based on local conditions and known/suspected sources.
www.michigan.gov /deq/0,1607,7-135-3313_3686_3728-32365--,00.html   (436 words)

  
 SPACE.com -- MORE IMAGES: Martian Sediment Layers Explained
Two basic processes are portrayed: deposition of sediment as dust settling out of the atmosphere, and deposition in bodies of water such as crater lakes and shallow seas.
The chief source for sediment in both cases may be a combination of materials produced by explosive volcanism and meteorite impact, as well as weathering and erosion, researchers said.
If the sediment fell from the air, then some recurring phenomenon would have had to create thin layers of regular thickness and properties -- the type of deposition that occurs in bodies of water.
www.space.com /scienceastronomy/solarsystem/mars_sediment_pics_001205.html   (831 words)

  
 k12 - Sediment
Sediment is considered a form of pollution when there is too much of it.
Sediment blocks sunlight, which means that algae cannot grow (by photosynthesis).
When excess sediment harms detritus, algae, oysters and fish, all the other organisms in the estuary are affected too.
coastgis.marsci.uga.edu /summit/k12sediment.htm   (715 words)

  
 Favorite Things : Fine Living Essentials : What is Wine Sediment? : Fine Living
To find out what exactly sediment is and how one can avoid getting it into the glass, we spoke to a wine educator and connoisseur.
Wine sediment is the solid material that settles to the bottom of a wine bottle.
To remove sediment before serving wine, simply decant the wine by pouring it slowly from the bottle into a decanter.
www.fineliving.com /fine/favorite_things_essentials/article/0,1663,FINE_1426_1923876,00.html   (350 words)

  
 U.S.G.S. Woods Hole Field Center, Analytical Labs
A rapid sediment analyzer that uses a pressure transducer to monitor the settling of sediment with time.
This laboratory is equipped to analyze carbon, count gamma emissions, process sediment cores, and digest biogenic silica in marine sediments.
Sediment Geochemistry Procedures - A compilation of the various methods used to analyze the sediments in this laboratory.
woodshole.er.usgs.gov /operations/sedimentlab/index.html   (343 words)

  
 Sediment laden drainage, Betsiboka River, Madagascar
The river is navigable for at least 130 kilometers (81 miles) inland and the lower reaches pictured here are noted for their extensive rice fields.
While the red sediment being transported provides an attractive and informative example of a river estuary, it is a symptom of an ecological disaster for Madagascar.
Brick-red lateritic soils, the result of tropical weathering, are responsible for the strong color of the sediments.
www.solarviews.com /cap/earth/sediment.htm   (169 words)

  
 SOFIA - OFR-00-327 - Results and Discussion - Sediment Geochemistry
The concentration of selected major and trace elements in the sediment core material from six cores taken from Taylor Slough is plotted in figures 4 and 5.
The concentration of selected trace elements in sediment core material (table 6), plotted in figure 5, show much greater regional and down-core variability than the major element patterns.
Sulfur concentrations and speciation were determined in the sediment and pore water and are reported elsewhere (Orem and others, 1999; W.H. Orem, unpublished data).
sflwww.er.usgs.gov /publications/ofr/00-327/resultssedgeo.html   (1443 words)

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