7197

• UCREFRP Catalog Number: 7197
• Author: O'Brien, J. S.
• Title: 1983 Yampa River Cobble Reach Morphology Investigation Final Report.
• USFW Year: 1984.
• USFW - Doc Type: Fort Collins, Colorado.
• Copyright Material: NO

J

TABLE OF CONTENTS
Page
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . iii
List of Photos . . . . . . . . . . . . . . . . . . . . . . . . . iii
List of Figures. . . . . . . . . . . . . . . . . . . . . . . . . . iv
INTRODUCTION . . . . . . . . . . . . . .. . . . . . . . . . . . . 1
General . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Setting . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Background . . . . . . . . . . . . . . . . . . . . . . . . 1
Objectives . . . . . . . . . . . . . . . . . . . . . . . . 8
METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Field Data Collection Program . . . . . . . . . . . . . . 9
RESULTS AND DISCUSSION . . . . . . . . . . . . . . . . . . . . . 10
Yampa River Canyon Morphology . . . . . . . . . . . . . . . 10
Historical Flow and Flood Frequency Analysis . . . . . . . . 14
Effective Discharge and Bankfull Discharge . . . . . . . . . 21
Sediment Transport . . . . . . . . . . . . . . . . . . . . 26
Transported Sediment and Substrate Size Distributions . . . 32
Physical Model Study . . . . . . . . . . . . . . . . . . . . 42
Dynamic Processes of Sand Transport over Cobble Substrate . 48
Mathematical Model Study . . . . . . . . . . . . . . . . . . 51
Minimum Streamflow Hydrograph . . . . . . . . . . . . . 62
Probable Effects of Reduced Annual Flow . . . . . . . . . 64
CONCLUSIONS AND RECOMMENDATIONS . . . . . . . . . . . . . . . . . 67
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
APPENDICES
APPENDIX A - PHYSICAL MODEL STUDY . . . . . . . . . . . . . 71
Range of Simulated Conditions . . . . . . . 71
Laboratory Facilities . . . . . . . . . . . 71
Data Collection . . . . . . . . . . . . . . 72
Calibration of the Helley-Smith Sampler . . 73
APPENDIX B - MATHEMATICAL MODEL DESCRIPTION . . . .. . . 76
Sediment Transport Processes . . . . . . . 76
Model Assumptions . . . . . . . . . . . 76
Model Calibration . . . . . . . . . . . . . 78
ACKNOWLEDGEMENTS . . . . . . . . . . . . . . . . . . . . 79
ii