Water Column

A water column is a conceptual column of water from surface to bottom sediments. This concept is used chiefly for environmental studies evaluating the stratification or mixing (e.g., by wind-induced currents) of the thermal or chemically stratified layers in a lake, stream or ocean. Some of the common parameters analyzed in the water column are: pH, turbidity, temperature, salinity, total dissolved solids, various pesticides, pathogens and a wide variety of chemicals and biota.

The concept of water column is quite important, since many aquatic phenomena are explained by the incomplete vertical mixing of chemical, physical or biological parameters. For example, when studying the metabolism of benthic organisms, it is the specific bottom layer concentration of available chemicals in the water column that is meaningful, rather than the average value of those chemicals throughout the water column.

Hydrostatic pressure can be analyzed by the height of a water column, which effectively yields the pressure at a given depth of the column.

The term "water column" is also commonly used in scuba diving to describe the area in which divers ascend and descend.

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Other articles related to "water column, water":

Treaty On Certain Maritime Arrangements In The Timor Sea - Treaty Provisions - Water Column Jurisdiction
... East Timor shall have "sovereign rights" over the water column north of the southern border of the Joint Petroleum Development Area established under the Timor Sea Treaty while Australia gains "sovereign ... Point Longitude (E) Latitude (S) Water column jurisdiction line in Annex II 1 126° 31' 58.4" 11° 20' 02.9" 2 126° 47' 08.4" 11° 19' 40.9" 3 126° 57' 11.4" 11° 17' 30.9" 4 126° 58' 17.4" 11° 17 ...
Treatment Wetland - Specific Contaminants Removal - Phosphorus Removal - Retention By Soils or Root-bed Media—phosphorus
... Oxidation-reduction potential (ORP, formally reported as Eh) of soil or water is a measure of its ability to reduce or oxidize chemical substances and may range between -35 ... back into solution as it dissolves However, the Fe+ 2 diffusing in the water column may be re-oxidized to Fe+ 3 and re-precipitated as an iron oxide when it encounters oxygenated ... This precipitation reaction may remove phosphate from the water column and deposit it back on the surface of sediments ...
Amictic Lake
... variations in temperature.” Amictic lakes exhibit inverse cold water stratification whereby water temperature increases with depth below the ice surface 0°C (less-dense) up to a theoretical maximum ... these physical/thermal influences have a limited effect on circulation in the water column ... however, refers to homogenization of the water column and so the term "amictic" is not meant to imply that the lake water is stagnant ...
Pelagic Zone
... Any water in a sea or lake that is neither close to the bottom nor near the shore can be said to be in the pelagic zone ... be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom ... Conditions change deeper down the water column the pressure increases, the temperature drops and there is less light ...

Famous quotes containing the words column and/or water:

    Never have anything to do with the near surviving representatives of anyone whose name appears in the death column of the Times as having “passed away.”
    Samuel Butler (1835–1902)

    When people are true friends, even shared water tastes sweet.
    Chinese proverb.