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Channel Routing Implementation and Output

Channel Routing Implementation and Output. Colleen O. Doten August 5, 2004. www.eas.purdue.edu/geomorph/envben.html. Sediment Module Implementation. Spatially constant parameters debris flow d 50 (set to 2 mm) and d 90 (set to 17 mm) Spatially variable parameters Soil Parameters

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Channel Routing Implementation and Output

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  1. Channel RoutingImplementation and Output Colleen O. Doten August 5, 2004 www.eas.purdue.edu/geomorph/envben.html

  2. Sediment Module Implementation • Spatially constant parameters • debris flow d50 (set to 2 mm) and d90 (set to 17 mm) • Spatially variable parameters • Soil Parameters • d50: 0.1 – 2.0 mm • Road Parameters • d50: 0.1 – 10 mm (All based on particle sizes for soil classes in basin (Dietrich et al. 1982))

  3. Sediment Module Implementation • Run for a six year period: 10/1/1991 to 9/30/1997 • Mass wasting algorithm was run for six events: • 05/08/1992 • 05/18/1993 • 05/30/1995 • 06/08/1996 • 05/17/1997 • 06/15/1997 • Hillslope erosion algorithm was run during eight periods of high modeled runoff: • 05/05 - 05/12/1992 • 05/18 - 05/31/1993 • 05/08 - 05/15/1994 • 05/21 - 06/06/1995 • 06/04 - 06/18/1996 • 05/16 - 05/21/1997 • 06/14 - 06/20/1997 • 07/06 - 07/12/1997 • Road erosion run for entire simulation period

  4. Default/Optional Output • Sed.Stream.Flow • total mass (kg) in the segment • total outflow concentration (ppm) from the segment • Sed.Stream.FlowOnly: total outflow concentration (ppm) from the segment • MassSediment.Balance • Total debris inflow (kg) • Total overland inflow (kg) • Total overroad inflow (kg) • Total amount of sediment stored in channels (kg)

  5. Default Output Final Mass Balance Inflow, 10825.05: Precip (mm): 10825.046539 Outflow 10848.39: ET (mm): 2228.923082 SnowVaporFlux (mm): 324.933797 CulvertToChannel (mm): 97.345524 ChannelInt (mm): 8172.765732 Storage: Initial Storage (mm): 313.569337 End of Run Storage (mm): 289.922714 Final SWQ (mm): 0.005673 Final Soil Moisture (mm): 289.269335 Final Surface (mm): 0.647699 Final Road Surface (mm): 0.003366 Other: RoadInt (mm): 284.574509 CulvertReturnFlow (mm): 162.807047 Mass Error (mm): -0.303537 Mass added to glacier (mm) 0.000000

  6. Final Sediment Mass Balance Total Mass Wasting MassWasted (m3): 1.05e+05 SedimentToChannel (m3): 4.03e+04 MassDepostion (m3): 6.49e+04 Mass Error (m3): -2.250000e+00 Average Surface Erosion Surface Erosion (mm): -1.42e-01 Surface Erosion (kg/hectare): -3.81e+03 Basin Average Road Surface Erosion Road Surface Erosion (mm): -3.82e-03 Road Surface Erosion (kg/hectare): -1.03e+02 Road Sediment to Hillslope (mm): 1.09e-03 Average Road Surface Erosion Road Surface Erosion (mm): -7.26e-01 Road Surface Erosion (kg/hectare): -1.95e+04 Road Sediment to Hillslope (mm): 2.08e-01 Channel Routing Inflow 9.99e+07: DebrisInflow (kg): 9.960434e+07 OverlandInflow (kg): 5.199485e+02 OverroadInflow (kg): 3.235117e+05 Outflow 2.66e+07: SedimentOutflow (kg): 2.656807e+07 CulvertReturnSedFlow (kg): 1.144171e+03 CulvertSedToChannel (kg): 2.931137e+01 Storage: Initial Storage (kg): 3.601377e+06 End of Run Storage (kg): 7.711814e+07 Final Bed Storage (kg): 7.709642e+07 Final Suspended Sediment (kg): 2.172592e+04 Mass Error (kg): 1.553289e+05 Default Output

  7. Modeled Channel Routing Simulated Rates, kg/ha/yr Hillslope erosion: 634 Road surface erosion: 17 – 41 (164 – 394 kg/km road) (3,247–7,842 kg/ha of road) Sediment Yield: 1,000 – 1,020 Published Rates, kg/ha/yr Hillslope erosion: 8 – 100 (north central WA) Road surface erosion: • 3,800 to 500,000 kg/km of road (Olympic Peninsula, WA) • 12,000 to 55,000 kg/ha of road (central ID) Sediment Yield: 813 – 13,500 (coastal OR and CA, western WA)

  8. Reported Sediment Yield • NOTES: • 1. All from Larson and Sidle (1980), except where noted. • 2. From Nelson (1971)

  9. Reported Channel Concentrations

  10. References Larson, K. R., and R.C. Sidle, 1980: Erosion and sedimentation data catalog of the Pacific Northwest. U.S. Department of Agriculture Forest Service, Pacific Northwest Region, R6-WM-050-1981, Portland, Oregon. Nelson, L.M., 1971, Sediment Transport by Stream in the Snohomish River Basin, Washington October 1967 – June 1969, United States Department of the Interior Geological Survey Open File Report .

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