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The modified Secchi disk design used in fresh water. The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water.
The Secchi disk has the advantages of integrating turbidity over depth (where variable turbidity layers are present), being quick and easy to use, and inexpensive. It can provide a rough indication of the depth of the euphotic zone with a 3-fold division of the Secchi depth , however this cannot be used in shallow waters where the disk can ...
Secchi depth is the depth at which a disk is no longer visible to the human eye. This measurement was created in 1865 and represents one of the oldest oceanographic methods. [23] [24] To measure Secchi depth, a white or black-and-white disk is mounted on a pole or line and lowered slowly down in the water. The depth at which the disk is no ...
Angelo Secchi S.J. (Italian pronunciation: [ˈandʒelo ˈsekki]; 28 June 1818 – 26 February 1878) was an Italian Catholic priest and astronomer from the Italian region of Emilia. [1] He was director of the observatory at the Pontifical Gregorian University (then called the Roman College ) for 28 years.
The following other wikis use this file: Usage on ca.wikipedia.org Disc de Secchi; Usage on cs.wikipedia.org Secchiho deska; Usage on de.wikipedia.org
By translating the Secchi transparency values to a log base 2 scale, each successive doubling of biomass is represented as a whole integer index number. [4] The Secchi depth, which measures water transparency, indicates the concentration of dissolved and particulate material in the water, which in turn can be used to derive the biomass.
The method is often used in conjunction with the Secchi disk submerged to half the Secchi depth, so that the color can be judged against a white background. [ 1 ] A set of color lighting filters against a white background can also be used as a Forel-Ule scale, called a Modern FU plastic scale.
Secchi depth, a measure of turbidity Secchi disk , an instrument used to measure turbidity SECCHI (Sun Earth Connection Coronal and Heliospheric Investigation), an instrument package on each of the STEREO spacecraft