FLake Parameters

Latitude: Longitude:
Water Clarity:
Very Clear (>5m) Turbid (1m)
Clear (2m) Very Turbid (<0.5m)

Get Your Favorite Lake Modelled!

This online version of FLake allows calculation of the approximate temperature and mixing pattern in any shallow freshwater lake around the world. Everything you need to know are the geographical coordinates, average depth of the lake and some estimate of lake water clarity. Apart from providing with the outlook of the FLake functionality, the online version of the model can help answering many frequently asked questions about lakes: In that way, this online tool can be of practical interest for many people, as for example:

Model configuration

External forcing of the model is adopted from the Global Data Assimilation System (GDAS) Archive. It consists of 3-hourly, global, 1 degree latitude longitude datasets of main meteorological parameters as provided by the GDAS model output of National Centers for Environmental Prediction (NCEP). Currently, the data sets cover the one-year period from November 2005 to November 2006 (a hydrological year). The model is run for several years applying repeatedly the same 2005/2006 meteorological data unless the model output arrives at the steady-state year cycle. Although such output cannot be directly considered as climatic mean (which would imply using of the climatic mean meteorology input), the procedure provides with a kind of approximation to it, simulating the artificial situation of a "perpetual year" 2005/2006.

Initial state of the model run is the fully mixed vertically temperature distribution. The initial temperature guess is drawn from the annual mean air temperature at the lake location. The validity of this approximation is supported by the fact that the model usually needs less than 5 iterations to arrive at the "perpetual year" solution.


Provide following input by filling the form at top of this page:


Currently, the model output is organized in two figures, one for the lake temperature evolution at the lake surface and at the lake bottom, another for the depth of the thermocline. The thermocline divides the upper mixed layer from quiescent deep waters, marked in the figure as light-blue and deep-blue areas correspondingly.