Channel RoutingImplementation and Output

Colleen O. Doten

August 5, 2004

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

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))

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

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)

Default OutputFinal 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

Default OutputFinal 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+02Road 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+04Road Sediment to Hillslope (mm): 2.08e-01

Channel RoutingInflow 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

Modeled Channel RoutingSimulated Rates, kg/ha/yrHillslope 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/yrHillslope 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)

NOTES:

1. All from Larson and Sidle (1980), except where noted.

2. From Nelson (1971)

Basin Location BasinArea,km2

Mean AnnualPrecipitation,

cm

ElevationRange, m

Mean AnnualSuspendedSediment

Yield, kg/ha

WaterYears

DeschutesRiver

WesternWashington

410 100-380 0-910 409 1971-73

Eel River NorthernCaliforniaCoast Range

750 120 560-2,130

3,420 1920-59

Flynn Creek Oregon CoastRange

2 250 N/A 984 1959-73

N. ForkCache Creek

NorthernCaliforniaCoast Range

510 80-130 400-1,480

2,110 1960-63

NisquallyRiver

WesternWashington

1,120 100-510 0-4,390 813 1971-73

SkykomishRiver2

WesternWashington

2,160 130-260 180-2,440

13,500 1967-69

SnoqualmieRiver2

WesternWashington

1,561 130-260 180-2,440

3,350 1967-69

Reported Sediment Yield

Station Name/ID Latitude/Longitude

BasinArea,km2

Days ofRecord

DaysMissing

Max,ppm

Mean,ppm

North River AboveJoe Cr, NrRaymond, WA12016600

46º51’40”123º44’00”

490 365(10/1/1964–9/30/1965)

0 210 17

SkookumchuckRiver NearBucoda, WA12026400

46º46’20”122º55’23”

290 1,095(10/1/1968–9/30/1971)

16 376 13

Wynoochee RiverNr Grisdale, WA12035400

47º22’50”123º36’31”

107 485(2/1/66–5/31/67)

21 1500 25

Clearwater CreekNear Mouth NearCougar, WA14216300

46º12’07”122º00’54”

85 2,358(1/1/82–9/30/88)

107 14,200 -

Muddy River AbClear Cr NrCougar, WA14216350

46º07’03”122º00’24”

218 7,30(10/1/81–9/30/83)

120 52,600 -

Reported Channel Concentrations

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 .