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.]
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References in periodicals archive ?
Development of an empirical model for chlorophyll-a and Secchi Disk Depth estimation for a Pampean shallow lake (Argentina).
The turbidity levels are determined by the Secchi disk depth (The Secchi disk depth provides a method for assessing turbidity.
Secchi disk depth (Secchi), water surface temperature (Temp), dissolved oxygen (DO) content, and pH were measured in situ, the rest of the chemical analyses were performed at Tartu laboratory of the Estonian Environmental Research Centre.