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null point

A Dictionary of Earth Sciences | 1999 | | Copyright

null point
1. In nearshore, shoaling waters, each particle-size of sediment should hypothetically have a null point, where there is no net movement of the particle landward or seaward. It is the point where there is a balance between the component of gravity acting down the slope in a seaward direction and the force on the particle resulting from the difference between the crest and trough velocities of the waves which tends to move the particle landwards.

2. In an estuary, the point at which the residual sea water landward flow is balanced by the seaward residual river flow.

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AILSA ALLABY and MICHAEL ALLABY. "null point." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "null point." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-nullpoint.html

AILSA ALLABY and MICHAEL ALLABY. "null point." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-nullpoint.html

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null point

A Dictionary of Ecology | 2004 | | Copyright

null point
1. In near-shore, shoaling waters, the (hypothetical) place at which there is no net movement of a particle of sediment landward or seaward, because there is a balance between the component of gravity acting down the slope in a seaward direction and the force on the particle resulting from the difference between the crest and trough velocities of the waves which tends to move the particle landwards.

2. In an estuary, the point at which the residual landward flow of sea water is balanced by the residual seaward flow of river water.

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MICHAEL ALLABY. "null point." A Dictionary of Ecology. 2004. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "null point." A Dictionary of Ecology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O14-nullpoint.html

MICHAEL ALLABY. "null point." A Dictionary of Ecology. 2004. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-nullpoint.html

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Free newspaper and magazine articles

	Null subjects: a reanalysis of the data.(Report) Magazine article from: Linguistics: an interdisciplinary journal of the language sciences; 5/1/2009
	Smarandache Breadth pseudo null curves in Minkowski space-time.(Report) Magazine article from: International Journal of Mathematical Combinatorics; 4/1/2009
	Simple closed null curves in Minkowski 3-space.(Report) Magazine article from: Scientia Magna; 9/1/2009