Hillslope Erosion Implementation and Output

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Presentation transcript:

Hillslope Erosion Implementation and Output Colleen O. Doten August 18, 2004 http:www.geo.uni-bonn.de/cgi-bin/geodynamik_main?Rubrik=research&Punkt=geomorphology

Sediment Module Implementation Spatially variable soil parameters Manning’s roughness coefficient, n: 0.01 – 0.02 (KINEROS2 model documentation) Kindex: 30 – 62 1/Joule (Wicks and Bathurst,1996) d50: 0.1 – 2.0 mm (Dietrich et al.,1982) Run for a six year period: 10/1/1991 to 9/30/1997 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

Default Output AggregatedSediment.Values MassSediment.Balance Hillslope erosion (basin average in mm) Sediment flux out (basin average in m3) Total overland inflow (kg) MassSediment.Balance Final Sediment Mass Balance Average Surface Erosion Surface Erosion (mm): -1.42e-01 Surface Erosion (kg/hectare): -3.81e+03

Optional Output Model Map (binary file) and Graphic Image (real-time): Hillslope erosion (basin average in mm) Sediment flux out (basin average in m3)

Model Results Simulated Rates, kg/ha/yr Published 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)

Sensitivity Analysis Infiltration six-year run, maximum difference in the average (daily and over the basin) runoff depth of less than 0.4 mm

References Dietrich, R.V., J.J.T. Dutro, and R.M. Foose, 1982: AGI Data Sheets for geology in the field, laboratory, and office, 2nd ed., American Geological Institute, Falls Church, VA. Engman, E.T., 1986: Roughness coefficients for routing surface runoff, Journal of Irrigation and Drainage Engineering, ASCE,112, 39-53. Helvey, J.P., 1980, Effects of a North Central Washington Wildfire on Runoff and Sediment Production, Water Resources Bulletin, l6, 627-634. Wicks, J.M. and J.C. Bathurst, 1996: SHESED: a physically based, distributed erosion and sediment yield component for the SHE hydrological modeling system, Journal of Hydrology, 175, 213-238. Woolhiser, D.A., 1975: Simulation of unsteady overland flow, Mahmood, K. and V. Yevjevich (eds), Unsteady Flow in Open Channels, V.II, Water Resources Publications, Fort Collins, CO., p. 502.