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If we assume that r is the radius of the particle, the constant in the formula should be 2/9 (4.5) rather than 1/18, because this is true for the diameter being squared in the formula.
The Stokes forumla only applies to small particles (fine sand and smaller), in which the wake behind the settling particle is laminar. For large particles (coarse sand and gravel), an emperical equation to account for flow turbulence should be used over the Stokes formula (e.g., see Dietrich, 1982).
Is sediment a synonym to alluvium? / Habj 15:08, 13 Jun 2005 (UTC)
These processes are very similar, and are already discussed in this article to some degree.
Also, this article doesn't have a clear distinction between transportation and deposition, as it is kind of mixed together in a mess.<Looks like this has been cleared up> It would also be nice to mention the basic [latin] diagenetic types: colluvium, fluvium, alluvium, and eluvium. + mwtoews 22:46, 3 November 2006 (UTC)
i think this article needs more information like the diffrent types of depostion and crap like that
I agree with the last section, that the article on deposits would be more complete if their were sections focusing on the diffrent types of deposits. I do not think it would be wise to merge this article on depositation with that on sediment. I feel sediment is more about the movement, and deposits are what happens when sediment is no longer moving. Also, I was looking at this artice to get a basis for coal deposits, and don't think anyone would call it coal sediment. 129.15.107.142 19:01, 21 February 2007 (UTC)
The topic of bedload needs its own article, since bedload often consists of pebble and gravel materials (which can be transported within the stream as well as deposited). Cuvette 19:23, 29 June 2007 (UTC)
If you want to be minimalist, perhaps this is a b class article. It lacks the following: images of sediment deposits Description of sediment size classes and their properities Description of aeolian processes and examples of aeolian derived deposits. Description of soil movement. These are generally called landslides. Images would be helpful. Description of glacial sediment deposits. Description of the function of sediment in stream channels and floodplains. The equations for stream form are not included and only mentioned in an offhand way. There is a general lack or references in all sections. There is a general lack of links to other articles that either cover the above, or complement the subject at hand.
This article reads like an expanded stub. I would give it a C- if it were turned in as a composition.
This paragraph is totally spurious. It is more polemic than information. If it is useful then it needs to be complemented by descriptions of other sources of sediments in other places, such as clear cut, normal sedimentation rates, farm erosion in western europe and china....blah blah blah... If it is still in the article without other additions when I return next I will delete it.
"One of the main causes of riverine sediment load siltation stems from
slash and burn treatment of
tropical
forests. When the ground surface is stripped of vegetation and then seared of all living organisms, the upper soils are vulnerable to both wind and water erosion. In a number of regions of the earth, entire sectors of a country have been rendered erosive; for example, on the
Madagascar high central
plateau, comprising approximately ten percent of that country's land area, virtually the entire landscape is sterile of
vegetation, with gully erosive furrows typically in excess of 50 meters deep and one kilometer wide.
Shifting cultivation is a farming system which sometimes incorporates the
slash and burn method in some regions of the world. The resulting sediment load in rivers flowing to the west is ongoing, with most rivers a dark red brown colour, also leading to massive fish kills."
Avram Primack (
talk) 16:50, 8 November 2008 (UTC)
The picture of carbonate precipitation in a stream in Switzerland is not an example of sedimentation, but rather a chemical process due to chemical saturation. The picture should be removed, as it is not an example of mechanical sedimentation. 193.64.21.60 ( talk) 20:43, 6 March 2012 (UTC)
This
level-4 vital article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||
|
If we assume that r is the radius of the particle, the constant in the formula should be 2/9 (4.5) rather than 1/18, because this is true for the diameter being squared in the formula.
The Stokes forumla only applies to small particles (fine sand and smaller), in which the wake behind the settling particle is laminar. For large particles (coarse sand and gravel), an emperical equation to account for flow turbulence should be used over the Stokes formula (e.g., see Dietrich, 1982).
Is sediment a synonym to alluvium? / Habj 15:08, 13 Jun 2005 (UTC)
These processes are very similar, and are already discussed in this article to some degree.
Also, this article doesn't have a clear distinction between transportation and deposition, as it is kind of mixed together in a mess.<Looks like this has been cleared up> It would also be nice to mention the basic [latin] diagenetic types: colluvium, fluvium, alluvium, and eluvium. + mwtoews 22:46, 3 November 2006 (UTC)
i think this article needs more information like the diffrent types of depostion and crap like that
I agree with the last section, that the article on deposits would be more complete if their were sections focusing on the diffrent types of deposits. I do not think it would be wise to merge this article on depositation with that on sediment. I feel sediment is more about the movement, and deposits are what happens when sediment is no longer moving. Also, I was looking at this artice to get a basis for coal deposits, and don't think anyone would call it coal sediment. 129.15.107.142 19:01, 21 February 2007 (UTC)
The topic of bedload needs its own article, since bedload often consists of pebble and gravel materials (which can be transported within the stream as well as deposited). Cuvette 19:23, 29 June 2007 (UTC)
If you want to be minimalist, perhaps this is a b class article. It lacks the following: images of sediment deposits Description of sediment size classes and their properities Description of aeolian processes and examples of aeolian derived deposits. Description of soil movement. These are generally called landslides. Images would be helpful. Description of glacial sediment deposits. Description of the function of sediment in stream channels and floodplains. The equations for stream form are not included and only mentioned in an offhand way. There is a general lack or references in all sections. There is a general lack of links to other articles that either cover the above, or complement the subject at hand.
This article reads like an expanded stub. I would give it a C- if it were turned in as a composition.
This paragraph is totally spurious. It is more polemic than information. If it is useful then it needs to be complemented by descriptions of other sources of sediments in other places, such as clear cut, normal sedimentation rates, farm erosion in western europe and china....blah blah blah... If it is still in the article without other additions when I return next I will delete it.
"One of the main causes of riverine sediment load siltation stems from
slash and burn treatment of
tropical
forests. When the ground surface is stripped of vegetation and then seared of all living organisms, the upper soils are vulnerable to both wind and water erosion. In a number of regions of the earth, entire sectors of a country have been rendered erosive; for example, on the
Madagascar high central
plateau, comprising approximately ten percent of that country's land area, virtually the entire landscape is sterile of
vegetation, with gully erosive furrows typically in excess of 50 meters deep and one kilometer wide.
Shifting cultivation is a farming system which sometimes incorporates the
slash and burn method in some regions of the world. The resulting sediment load in rivers flowing to the west is ongoing, with most rivers a dark red brown colour, also leading to massive fish kills."
Avram Primack (
talk) 16:50, 8 November 2008 (UTC)
The picture of carbonate precipitation in a stream in Switzerland is not an example of sedimentation, but rather a chemical process due to chemical saturation. The picture should be removed, as it is not an example of mechanical sedimentation. 193.64.21.60 ( talk) 20:43, 6 March 2012 (UTC)