Improved temperature retrieval methods for the validation of a hydrodynamic simulation of a partially frozen power plant cooling lake
2010
The ALGE code is a hydrodynamic model developed by Savannah River National Laboratory (SRNL) to derive
the power output levels of an electric generation facility from observing the associated cooling pond with an aerial
imaging platform. Over the past two years work has been completed to extend the capabilities of the model to
incorporate snow and ice as possible phenomena in the modeled environment. In order to validate the extension
of the model, intensive ground truth data as well as high-resolution aerial infrared imagery were collected during
the winters of 2008-2009 and 2009-2010, for a combined eight months of data collection. Due to the harsh and
extreme environmental conditions automatic data collection instruments were designed and deployed. Based on
experience gained during the first collection season and equipment design failures, overhauls in the design and
operation of the automated data collection buoys were performed. In addition, a more thorough and robust twofold
calibration technique was implemented within the aerial imaging chain to assess the accuracy of the retrieved
surface temperatures. By design, the calibration method employed in this application uses ground collected, geolocated
water surface temperatures and in-flight blackbody imagery to produce accurate temperature maps of
the pond in interest. A sensitivity analysis was implemented within the data reduction technique to produce
accurate sensor reaching temperature values using designed equipment and methods for temperature retrieval at
the water's surface.
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