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<br />CONTENTS <br /> <br /> <br />CONTENTS............................................................. ................. ................... ......... .............. 2 <br /> <br />AB STRA CT..................................................................... ................................................... 4 <br /> <br />INTRO D U CTI ON .............................................................................................................. 6 <br /> <br />STUD Y AREA................................... ................................................................................ 7 <br /> <br />Physiographic Setting....................................................................................... .............. 7 <br /> <br />Streamflow Regulation................................................................................................... 9 <br /> <br />Sediment Supply............................................................................................................. 9 <br /> <br />Previous Geomorphic Investigations in Glen Canyon.................................................. 11 <br /> <br />METHODS.................................................................................. ..................................... 14 <br /> <br />Measurements of the Bed. .......................... ................... ............................... .......... ....... 14 <br /> <br />Bureau of Reclamation Cross-sections .......................... ....................................... .... 14 <br />Lees Ferry Gaging Station........................................................................................ 15 <br />Mapping of Alluvial Deposits....................................................................................... 17 <br />Mapping From Aerial Photographs .......................................................................... 17 <br />Characterization of Eddy Deposits ........ ................................................................... 20 <br />Accuracy of the Surficial Geologic Maps................................................................. 21 <br /> <br />RESULTS.......................................... ............... ................................................................ 23 <br /> <br />Rate and Magnitude of Bed Degradation...................................................................... 23 <br />The onset of degradation and the channel cleaning flows ........................................ 23 <br />Continued degradation and the magnitude of sediment evacuation ......................... 24 <br />Spatial pattern of bed adjustment and development of the post-dam longitudinal <br /> <br />profile................................................... .......................................... ........................... 25 <br /> <br />Magnitude of bed degradation relative to pre-dam scour-and-fiIL.......................... 27 <br /> <br />Upper Lees Ferry Cableway ................................................................................. 27 <br /> <br />Lower Lees Ferry Cableway .................................................................................28 <br /> <br />Channel-width changes at the Lower Lees Ferry Gableway ........................................29 <br />Alluvial Deposits in Glen Canyon ................................................................................ 31 <br />Glen Canyon in 1952.................. ........ ...................... ...................... .......................... 31 <br />Glen Canyon in 1984-2000............ ............................. ................... ........................... 32 <br />Erosion and Deposition of Alluvial Deposits ............................................................... 33 <br />Erosion and Deposition: 1950s to 1984.................................................................... 33 <br />Erosion and Deposition: 1984 to 1996...................................................................... 35 <br />Erosion and Deposition in Eddies ............................................................................. 36 <br /> <br />DISCUS SI ON ................................................... ................................................................ 37 <br /> <br />Adjustment of the Bed .. ........................................................................... ..................... 37 <br /> <br />Adjustment of Alluvial Deposits .................................................................................. 40 <br /> <br />CON CL USI ONS.......................................... ..................................................................... 41 <br /> <br />REFERENCES ..................................................................................................... ............ 43 <br /> <br />TABLES ................................................................ .................. ......................................... 46 <br /> <br />FIGURE CAPTIONS........ ............................. ............................. ...................................... 53 <br /> <br />FIGURES ........................................................................................ .................................. 56 <br /> <br />APPENDICES...................................................... ............................................................ 83 <br /> <br />Appendix A: Pre-dam Sediment Transport and Storage in Glen Canyon ................... 83 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />2 <br />