Modeling changes in rill erodibility and critical shear stress on native surface roads
Foltz, R.B.; Rhee, H.; Elliot, W.J. 2008.
Modeling changes in rill erodibility and critical shear stress on native surface roads.
Hydrological Processes. 22:4783-4788.
Keywords: soil erosion, forestry, sediment depletion, overland flow, simulation, Idaho, shear stress, road
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This study investigated the effect of cumulative overland flow on rill erodibility and
critical shear stress on native surface roads in central Idaho. Rill erodibility decreased exponentially
with increasing cumulative overland flow depth; however, critical shear stress did not change.
The study demonstrated that road erodibility on the studied road changes over the course of one or more
consecutive overland flow events. Therefore, model simulations that fail to take into consideration this
change will probably over-estimate sediment yields. An exponential function describing the relationship
between rill erodibility and cumulative overland flow depth is presented as a basis for future model
development for simulating erosion on native surface roads.
Moscow FSL publication no. 2008k