Secchi disk

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Related to Secchi disk depth: Secchi disk transparency

Secchi disk

n.
A disk, divided into black and white quarters, used to gauge water clarity by measuring the depth at which it is no longer visible from the surface.

[After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Secchi disk depth is the simplest and one of the most effective tools for estimating a lake's productivity.
Spatial patterns of abundance of black sea bass showed no consistent relationship with temperature, salinity, dissolved oxygen, and Secchi disk depth, a measure of water transparency (P>0.05), but CPUE was positively correlated with water depth (P=0.025).
The turbidity levels are determined by the Secchi disk depth (The Secchi disk depth provides a method for assessing turbidity.
The estimation of TSI requires six physical, chemical, and biological parameters including total phosphorus (TP), total nitrogen (TN), chemical oxygen demand (COD), Secchi disk depth (SD), chlorophyll-a (Chl-a) concentration and phytoplankton biomass (CA) to know the eutrophication state of the lake environment.
(1997) said that the remotely sensed data have widely been used to estimate major water quality variables such as chlorophyll-a, turbidity, suspended sediment concentration, Secchi disk depth, surface water temperature, wave height, and sea surface roughness.