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TABLE OF CONTENTS <br />ACKNOWLEDGMENTS ................................................ ii <br />LIST OF TABLES .......................................................v <br />LIST OF FIGURES ..................................................... vi <br />LIST OF KEY WORDS ................................................. ix <br />EXECUTIVE SUMMARY ............................................... x <br />1 INTRODUCTION .....................................................1 <br />1.1 RIVER ICE FORMATION ...................................... 2 <br />2 METHODS ..........................................................6 <br />2.1 THE STUDY REACH .......................................... 6 <br />2.2 HISTORICAL CONDITIONS AND OBSERVATIONS ............... 6 <br />2.2.1 Flow Rates ..........................................:. 6 <br />2.2.2 Water and Air Temperature Measurements ................... 7 <br />2.2.3 Historical Ice Observations ............................... 7 <br />2.3 19961997 FIELD MEASUREMENTS .............................. S <br />2.4 ICE PROCESS MODELING ..................................... 9 <br />2.4.1 Unsteady Flow Sub-Model .............................. 10 <br />2.4.1.1 Channel Geometry Data .......................... 11 <br />2.4.1.2 Calibration of UNET Unsteady Flow Model ......... 11 <br />2.4.2 Transport Sub-Model ................................... 13 <br />2.4.3 Ice Cover Progression Sub-Model ......................... 13 <br />3 RESULTS ..........................................................14 <br />3.1 HISTORICAL CONDITIONS AND OBSERVATIONS .............. 14 <br />3. 1.1 Winter Flows ......................................... 14 <br />3.1.2 Water and Air Temperatures ............................. 15 <br />3.1.3 Ice Formation on the Green River ......................... 16 <br />3.1.3.1 USGS Observations ............................ 16 <br />3.1.3.2 BIO/WEST Reports ............................ 16 <br />-iii-