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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 standard measurement for underwater visibility is the distance at which a Secchi disc can be seen. The range of underwater vision is usually limited by turbidity. In very clear water visibility may extend as far as about 80m, [18] and a record Secchi depth of 79 m has been reported from a coastal polynya of the Eastern Weddell Sea ...
On July 11 about midday, the Storm Drain Detectives, with the help of Lodi Fire Department's boat, used a Secchi Disk to test water clarity at three sites in both the lake and Mokelumne River as ...
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 ...
The lake sports a 9 ft 2 in – 34 ft 9 in (2.8–10.6 m) annual depth range in Secchi disk-measured water visibility from 1981 to 2020. [10] Temperature profile of Trout Lake in degrees Celsius by depth in meters for spring, summer, fall, and winter [3]
The volunteers use black and white quadrant secchi disk (about eight inches) method to collect samples within Namakagon lake to measure the transparency throughout the season/year to year of water clarity. Secchi disk calculates the depth when the disk is lowered down into the water until it can not be seen.
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.
Relationships between Trophic State Index, chlorophyll, phosphorus, Secchi depth, and trophic class (after Carlson 1996) [4] Trophic State Index Chlorophyll (μg/L) Phosphorus (μg/L) Secchi depth (m) Trophic Class < 30—40 0—2.6 0—12 > 8—4 Oligotrophic or hipotrophic 40—50 2.6—7.3 12—24 4—2 Mesotrophic 50—70 7.3—56 24—96