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Slope-area thresholds of road-induced gully erosion and consequent hillslope-channel interactions


Katz, Harry Alexander; Daniels, J. Michael; Ryan, Sandra. 2013. Slope-area thresholds of road-induced gully erosion and consequent hillslope-channel interactions. Earth Surface Processes and Landforms. doi: 10.1002/esp.3443.

Pikes Peak Highway is a partially paved road between Cascade, Colorado and the summit of Pikes Peak. Significant gully erosion is occurring on the hillslopes due to the concentration of surface runoff, the rearrangement of drainage pathways along the road surface and adjacent drainage ditches, and the high erodibility of weathered Pikes Peak granite that underlies the area. As a result, large quantities of sediment are transported to surrounding valley networks causing significant damage to water quality and aquatic, wetland, and riparian ecosystems. This study establishes the slope/drainage area threshold for gullying along Pikes Peak Highway and a cesium-137 based sediment budget highlighting rates of gully erosion and subsequent valley deposition for a small headwater basin.

Keywords: gully erosion; hillslope-channel coupling; sediment budgets; roads; cesium-137


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http://www.fs.fed.us/rm/pubs_other/rmrs_2013_katz_h001.pdf

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Title: RMRS Other Publications: Slope-area thresholds of road-induced gully erosion and consequent hillslope-channel interactions
Electronic Publish Date: October 24, 2013
Last Update:
October 24, 2013

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