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Activity Number:
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18
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Type:
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Topic Contributed
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Date/Time:
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Sunday, July 29, 2007 : 2:00 PM to 3:50 PM
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Sponsor:
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IMS
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| Abstract - #308963 |
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Title:
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Assimilation of Current Measurements into a Circulation Model of Lake Michigan
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Author(s):
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Zepu Zhang*+ and Dmitry Beletsky and David Schwab and Michael Stein
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Companies:
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The University of Chicago and University of Michigan and National Oceanic and Atmospheric Administration and The University of Chicago
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Address:
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5734 S. Ellis Ave, Chicago, IL, 60637,
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Keywords:
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stream function ; kriging ; Princeton Ocean Model ; data assimilation ; hydrodynamic modeling
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Abstract:
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We present a method for assimilating current measurements into a 2-D circulation model of Lake Michigan. Measurements are assimilated by updating the stream function of the velocity field via kriging interpolation, therefore the physical constraint of a non-divergent flow is satisfied in the updated field. Moreover, the use of stream function avoids a component-wise treatment to the velocity vector. The coastal constraint is represented by the stream function being constant along the coastline, and is implemented by incorporating pseudo coastal data into the interpolation. This eliminates the need to construct complex spatial covariance models. The method also accommodates measurement uncertainties. Results show the method's ability to successfully meld measurements into simulations with the effect propagating in space and time, and the critical role of the covariance model.
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