Author(s): Ragnar Ekker; Anund S. Kvambekk

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Abstract: During the recent years NVE has developed an internet based ice information system "ismelding" that weekly report the ice conditions on lakes in Norway. In order to improve our service we have developed a one-dimensional thermodynamic model for lake ice thickness simulations. The model uses input from the Norwegian Metrological Surface Network database, publically available through eKlima. no. The model can be run in real-time on the latest observations and can use the 10 day forecasts given from met. no to predict the expected changes. The fist step in the model development has been to model ice thickness as one homogenous layer with an added snowpack layer calculated in seNorge. no model. The energy balance is calculated from the metrological variables: air temperature, wind speed, relative humidity, air pressure and cloud fraction. Freeze-up time is based on on-site observations, from webcams and from remote sensing. This season, on-site observations were done on two climatically different locations; one low landlake and one mountain lake. The locations where chosen based on the availability of input climate data and ice and snow thickness data. We will present results of the model for the 2009/10 from both observations sites.

DOI:

Year: 2010