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<br />FINAL REPORT, November 2003 <br />High-jlow Requirements for the Duchesne River <br /> <br />Sediment Delivery to the Study Reach from Upstream.................................................. 47 <br />Local Sources of Fine-grained Sediment. ..... ..................................................................48 <br />Uncertainty in Estimated Suspended Sediment Loads ................................................... 49 <br />Longitudinal Classification of the River System.............................................................. 52 <br /> <br /> <br />Longitudinal Profile........................................................................................................ 52 <br /> <br />Characteristics of the Alluvial Valley ............................................................................. 52 <br />Characteristics of the Channel......... ....... ....... ........................... ................... ................... 54 <br />Discharges Necessary to Access High Bars and Secondary Channels ........................... 55 <br /> <br /> <br />24-hour Camp................................................................................................................. 56 <br /> <br /> <br />Above Pipeline................................,............................................................................... 58 <br /> <br /> <br />Wissiup. Return....................................................................................... ......................... 59 <br /> <br />Integration of Reach Results ............. ....... ........... ............ ............ ....... ............... .............. 60 <br />Discharges Necessary to Entrain Gravel.......................................................................... 60 <br /> <br /> <br />Green River Backwater Analysis ...................................................................................... 61 <br /> <br />Historic Changes of the Duchesne River Channel and Alluvial Surfaces .....................62 <br />Qualitative Summary of Historic Channel Changes....................................................... 62 <br />Changes in Channel Widths through Time ..................................................................... 65 <br />Changes in channel sinuosity through time .................................................................... 67 <br />Areas of Erosion and Deposition as an Index of River Activity ..................................... 68 <br />Gravel Erosion and Deposition as an Index of River Activity........................................ 70 <br />Changes in Sediment Storage between Photo Intervals .................................................. 73 <br />Reach-scale Changes in Gravel Storage ......................................................................... 73 <br />Longitudinal Changes in Subreach Gravel Storage ........................................................ 76 <br /> <br /> <br />Dendrochro n ology and Stratigrap hy ................................................................................ 78 <br /> <br /> <br />Synthesis of Historic Data ..................... ...... ........... ............................................................ 79 <br /> <br />Channel Narrowing and Simplification in Zones 3 and 4............................................... 79 <br />Bed Aggradation and Avulsion in Zones 1b and 2.........................................................80 <br />Channel Transformation in Zone 2 ................................................................................. 80 <br />Changes in Channel Responses after 1969.....................................................................82 <br />The Question of Equilibrium ................... ..... .......................... ....... .............. ................... 83 <br />Relationship between Duchesne River Changes and the Hydrologic Record ...............84 <br /> <br />III <br />