We are grateful for the support provided by the National Science Foundation (CMS-9500184), the National Aeronautics and Space Administration (NAG5-2774), and the Iowa Institute of Hydraulic Research. Numerical computations were performed under collaborative agreement between the Department of Geography, the Swiss Federal Institute of Technology (ETH), and the University of Iowa Institute of Hydraulic Research. We also thank Emad Habib for his help.
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