Secchi depth
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Secchi disk — The Secchi disk, created in 1865 by Pietro Angelo Secchi, is a circular disk used to measure water transparency in oceans and lakes. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the pattern on… … Wikipedia
Secchi disc — a 20 30 cm diameter disc marked in 2 black and 2 white opposing quadrants, lowered into the water. The average of the depth at which it disappears from sight and the depth at which it reappears when lowered and raised in the water column is the… … Dictionary of ichthyology
Secchi disk — or Secchi disc [sek′ē] n. a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears * * * … Universalium
Secchi disk — or Secchi disc [sek′ē] n. a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears … English World dictionary
Secchi (lunar crater) — lunar crater data latitude=2.4 N or S=N longitude=43.5 E or W=E diameter=25 km depth=1.9 km colong=317 eponym=P. Angelo SecchiSecchi is a small lunar crater formation on the northwest edge of Mare Fecunditatis. To the northeast is the Taruntius… … Wikipedia
Secchi disc — /ˈsɛki dɪsk/ (say sekee disk) noun a disc used to gauge water clarity by measuring the depth at which it is no longer visible from the surface. {created in 1865 by Pietro Angelo Secchi, Italian astronomer, 1818–78} …
secchi disc — ˈsekē noun Usage: usually capitalized S Etymology: after Angelo Secchi died 1878 Italian astronomer : a reflective disc lowered into a body of water to permit measurement of the relative transparency of the water by recording the depth at which… … Useful english dictionary
Trophic state index — The quantities of nitrogen, phosphorus, and other biologically useful nutrients are the primary determinants of a body of water s trophic state index (TSI). Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water … Wikipedia
Turbidity — standards of 5, 50, and 500 NTU Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key… … Wikipedia
Lake — For other uses, see Lake (disambiguation). Oeschinen Lake in the Swiss Alps A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the… … Wikipedia
