Three long-term FLAKE calculations are presented below tested against observations data on vertical temperature structure. Three German lakes are simulated, the Heiligensee, the Mueggelsee and the Stechlinsee, located in the same climatic zone, but revealing esssentially different temperature and mixing regimes, mostly on account of different morphometry. Such choice provides with opportunity of testing the model reliability for various mixing conditions.
Test runs were performed in frames of research projects KI 853/2-1 and KI 853/3-1 funded by the
German Science Foundation (DFG). Lake data collected at the Leibniz-Institute of
Freshwater Ecology and Inland Fisheries, Berlin. The model configuration is similar in all three cases and is typical for long-term simulations
covering more than one year:
Shallow lake located in the north part of Berlin, Germany. mean depth 5.9m, maximum depth 8.1m, lake area 0.9km^2.
The lake is dimictic, i.e. is mixed down to the bottom twice a year in the spring and in the autumn. The lower part of the water column remains stratified duruing the summer, which behaviour is also predicted by the model.
To start the case on your computer: 1. Download and unpack the model file FLAKE 2. Downoad two following files into the same directory as the model: Model configuration (file Heiligensee80-96.nml): Meteorology Input (file Potsdam80-96.dat) 3. Open the directory in the Windows Explorer and type in the command line (press "Windows key"+R to call the command window): FLAKE Heiligensee80-96.nml 4. Resulting output file Heiligensee80-96.rslt should be identical to the provided Heiligensee80-96.test
Lake morphometry
Shallow lake located in the south-east part of Berlin, Germany. mean depth 4.5m, maximum depth 8.0m, lake area 7.3 km^2.
The lake is polymictic, i.e. is mixed down to the bottom repeatedly during a year with occasional vertical stratification periods in summer. Therefore, no mixed layer depth is shown in figures, but the surface-bottom temperature difference. The same meteorology input is used here as for the Heiligensee because both lakes are situated close to each other.
To start the case on your computer: 1. Download and unpack the model file FLAKE 2. Downoad two following files into the same directory as the model: Model configuration (file Mueggelsee80-96.nml): Meteorology Input (file Potsdam80-96.dat) 3. Open the directory in the Windows Explorer and type in the command line (press "Windows key"+R to call the command window): FLAKE Mueggelsee80-96.nml 4. Resulting output file Mueggelsee80-96.rslt should be identical to the provided Mueggelsee80-96.test
Lake morphometry
The lake is located 100km north to Berlin. mean depth 23.0m, maximum depth 68.0m, lake area 4.3km^2.
The lake can be classified as deep dimictic. A strong thermocline exists during summer at 5-10m depth, and near-bottom temperatures stay at 4-6^oC. Note the small heat exchange between water and sediments in the last figure. The meteorology input from the near-shore station is used.
To start the case on your computer: 1. Download and unpack the model file FLAKE 2. Downoad two following files into the same directory as the model: Model configuration (file Stechlin94-98.nml): Meteorology Input (file Stechlin94-98.dat) 3. Open the directory in the Windows Explorer and type in the command line (press "Windows key"+R to call the command window): FLAKE Mueggelsee80-96.nml 4. Resulting output file Stechlin94-98.rslt should be identical to the provided Stechlin94-98.test
Lake morphometry
