Scientific Investigations Report 2008–5093
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5093
Simulation of Flow, Sediment Transport, and Sediment Mobility of the Lower Coeur d’Alene River, Idaho
Prepared in cooperation with the Idaho Department of Environmental Quality, Basin Environmental Improvement Commission, and the U.S. Environmental Protection Agency
By Charles Berenbrock and Andrew W. Tranmer
Table of Contents
Conversion Factors, Datums, and Abbreviations and Acronyms
Abstract
Introduction
Previous Investigations
Reach Characterization
Sediment-Transport Characteristics
Numerical Modeling
Summary
Acknowledgments
References Cited
Glossary
Appendix A. Locations of Cross Sections on the Coeur d’ Alene River, Idaho (PDF, 776 KB)
Appendix B. Particle-Size Analysis of Streambed Samples in the Dudley Reach, Coeur d’Alene River, Idaho (PDF, 392 KB)
Appendix C. Listing of HEC-6 Model Input File for 1999 (PDF, 445 KB)
Appendix D. Grain Shear Stress, Largest Mobilized Particle, and Particle Classification for FASTMECH simulations 1 through 5, Coeur d'Alene River, Idaho (PDF, 112 KB)
Figures
Figure 1. Location of study area and U.S. Geological Survey gaging stations, Coeur d’Alene River basin, Idaho.
Figure 2. Location of study area, U.S. Geological Survey gaging stations, river miles, and lateral lakes, Coeur d’Alene River basin, Idaho.
Figure 3. Water-surface curves along a constant, uniform, mild-sloped channel.
Figure 4. Simulated water-surface curves for a discharge of 25,000 cubic feet per second in the lower Coeur d’Alene River, Idaho.
Figure 5. Daily water levels on Coeur d’Alene Lake at Coeur d’Alene (12415500), Idaho.
Figure 6. Water-surface elevations and discharge at selected gaging stations on the Coeur d’Alene River and Coeur d’Alene Lake, 1994–2000.
Figure 7. Relation between water-surface elevation for Coeur d’Alene Lake, and the Harrison and Rose Lake gaging stations in the study reach, Coeur d’Alene River, Idaho.
Figure 8. Discharge at selected gaging stations on the Coeur d’Alene River, Idaho.
Figure 9. Comparison of selected cross sections in the braided reach on the Coeur d’Alene River, Idaho.
Figure 10. Sediment-transport curves for suspended sand discharges at selected sites in the study area, Coeur d’Alene River, Idaho.
Figure 11. Sediment-transport curves for suspended silt and clay (fines) discharges at selected sites in the study area, Coeur d’Alene River, Idaho.
Figure 12. Total sediment discharge (QT) and suspended-sand discharge (Qsand) curves at selected sites in the study area, Coeur d’Alene River, Idaho.
Figure 13. Calibrated Manning’s n values (roughness coefficients) of the streambed for modeled reaches, Coeur d’Alene River, Idaho.
Figure 14. HEC-6 simulated and measured sediment sand discharge and daily mean discharge for calendar year 1999 at the Coeur d’Alene River at Rose Lake gaging station (12413810) and Coeur d’Alene River near Harrison gaging station (12413860), Coeur d’Alene River, Idaho.
Figure 15. Simulated sediment discharge of sand and daily mean discharge at cross section 156.504 dredged reach for calendar years 2000 and 1997, Coeur d’Alene River near Dudley, Idaho.
Figure 16. Simulated streambed elevations before and after streambed dredging and at the end of simulation for calendar years 2000 and 1997, Coeur d’Alene River near Dudley, Idaho.
Figure 17. Model grid of the multi-dimensional flow model, Coeur d’Alene River near Dudley, Idaho.
Figure 18. Simulated water-surface elevations from FASTMECH and HEC-6 models and mean absolute difference error, Coeur d’Alene River near Dudley, Idaho.
Figure 19. Simulated depths from FASTMECH for five calibration simulations, Coeur d’Alene River near Dudley, Idaho.
Figure 20. Simulated velocities from FASTMECH for five calibration simulations, Coeur d’Alene River near Dudley, Idaho.
Figure 21. Velocity vectors and average and maximum velocities at cross sections for a river discharge of 28,900 cubic feet per second in the dredged reach, Coeur d’Alene River near Dudley, Idaho.
Figure 22. Velocity vectors for a river discharge of 28,900 cubic feet per second in a river bend near cross section 158.259, Coeur d’Alene River near Dudley, Idaho.
Figure 23. Simulated bed shear stresses from FASTMECH for five calibration simulations, Coeur d’Alene River near Dudley, Idaho.
Tables
Table 1. Elevation of river and lake stage datums at U.S. Geological Survey gaging stations on the Coeur d’Alene River and
Coeur d’Alene Lake, Idaho.
Table 2. Median diameter and particle-size classification of streambed samples, Coeur d’Alene River, Idaho.
Table 3. Particle-size classification.
Table 4. Measured and HEC-6 simulated water-surface elevations and differences in four model calibrations for five gaging stations in the modeled reach, Coeur d’Alene River, Idaho.
Table 5. Boundary conditions for FASTMECH model calibrations, Coeur d’Alene River near Dudley, Idaho.
Table 6. Calibrated drag coefficient and lateral-eddy viscosity and differences between model simulated and observed HEC-6 water-surface elevations for five calibrations, Coeur d’Alene River near Dudley, Idaho.
Table 7. Critical shear stress by particle-size classification for determining approximate condition for sediment mobility at 20 degrees Celsius.
Table 8. Grain shear stress, largest mobilized particle, and particle classification for a factor of 0.5, 1.0, and 1.5 times the dune height and (or) dune length for simulation 5 (river discharge, 28,900 cubic feet per second), Coeur d’Alene River near Dudley, Idaho.
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Send questions or comments about this report to the author, Charles Berenbrock, (703) 648-6876.
U.S. Department of the Interior | U.S. Geological Survey