Channel Routing Implementation and Output

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Channel RoutingImplementation and Output

• Colleen O. Doten
• August 5, 2004

www.eas.purdue.edu/geomorph/envben.html
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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))

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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

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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)

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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

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Default Output

• Final Sediment Mass Balance
• Total Mass Wasting
• MassWasted (m3) 1.05e05
• SedimentToChannel (m3) 4.03e04
• MassDepostion (m3) 6.49e04
• Mass Error (m3) -2.250000e00
• Average Surface Erosion
• Surface Erosion (mm) -1.42e-01
• Surface Erosion (kg/hectare) -3.81e03
• Basin Average Road Surface Erosion
• Road Surface Erosion (mm) -3.82e-03
• Road Surface Erosion (kg/hectare) -1.03e02
• Road Sediment to Hillslope (mm) 1.09e-03
• Average Road Surface Erosion
• Road Surface Erosion (mm) -7.26e-01

• Channel Routing
• Inflow 9.99e07
• DebrisInflow (kg) 9.960434e07
• OverlandInflow (kg) 5.199485e02
• OverroadInflow (kg) 3.235117e05
• Outflow 2.66e07
• SedimentOutflow (kg) 2.656807e07
• CulvertReturnSedFlow (kg) 1.144171e03
• CulvertSedToChannel (kg) 2.931137e01
• Storage
• Initial Storage (kg) 3.601377e06
• End of Run Storage (kg) 7.711814e07
• Final Bed Storage (kg) 7.709642e07
• Final Suspended Sediment (kg)
  2.172592e04

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Modeled Channel Routing

• Simulated Rates, kg/ha/yr
• Hillslope erosion 634
• Road surface erosion 17 41 (164 394 kg/km
  road) (3,2477,842 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)

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