12) In addition to the customary locational and structural variables, they use Secchi disk
readings as an objective measure of water clarity.
Zooplankton samples were collected every month at five selected stations in the lake with three replicates, and the water temperature, dissolved oxygen, pH, Secchi disk
depth, electrical conductivity, and depth were measured at the stations.
depth: A new theory and mechanistic model for underwater visibility.
In present work, the infestation rate decreases with increase in turbidity, and water clarity measured with Secchi disk
showed positive relation to isopod infestation.
The application of molasses to the culture water significantly reduced the Secchi disk
depth (p < 0.
Field and laboratory methods used for different variables Variable Abbreviation Unit Physical and chemical variables Water level WL cm Secchi disk
depth Secchi m Water surface Temp [degrees]C temperature Dissolved oxygen DO mg [L.
Drop a big white grub or spinnerbait (or a 12-inch Secchi disk
if you have one) into the water and when you can no longer see it, measure this depth to the surface and double it.
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.
Water clarity was measured using a Secchi disk
at each location.
Additionally, the Secchi disk
transparency was determined in each occasion on each lake.
It is a proxy the scientific community has long accepted as legitimate, said Paul Falkowski of Rutgers University, who has used Secchi disk
data for his work.
Two reservoir locations were monitored bi-weekly from May through September 2007 for pH, temperature, dissolved oxygen, Secchi disk
transparency, chlorophyll a, and nutrients.