0.08921599388123112335RMRSRMRSPublished to Web1Publication1Formally Refereed1Scientific Journal (JRNL)<![CDATA[Friction angle measurements on a naturally formed gravel streambed: Implications for critical boundary shear stress]]> 1992-1We report the first measurements of friction angles for a naturally formed gravel streambed. For a given test grain size placed on a bed surface, friction angles varied from 10º to over 100º; friction angle distributions can be expressed as a function of test grain size, median bed grain size, and bed sorting parameter. Friction angles decrease with increasing grain size relative to the median bed grain size, and are a systematic function of sorting, with lower friction angles associated with poorer sorting. The probability distributions of critical shear stress for different grain sizes on a given bed surface, as calculated from our friction angle data, show a common origin, but otherwise diverge with larger grains having narrower and lower ranges of critical shear stresses. The potential mobility of a grain, as defined by its probability distribution of critical shear stress, may be overestimated for larger grains in this analysis, because our calculations do not take into account the effects of grain burial and altered near-bed flow fields.Buffington, John M.; Dietrich, William E.; Kirchner, James W. 1992. Friction angle measurements on a naturally formed gravel streambed: Implications for critical boundary shear stress. Water Resources Research. 28(2): 411-425.]]>https://www.fs.fed.us/rm/pubs_journals/1992/rmrs_1992_buffington_j001.pdf1.0 MBhttps://www.fs.usda.gov/treesearch/pubs/23974239740Water Resources Research. 28(2): 411-425.0282411425T0Buffington, John M.; Dietrich, William E.; Kirchner, James W.; 25-JUL-2006 12:00:2320-AUG-2016 10:30:10AY16-JAN-2015 11:50:1332Hydrology, watersheds, sedimentation63WaterBuffington, John M.RMRS4354jbuffington2104111Dietrich, William E.002Kirchner, James W.003Buffington, John M.RMRS4354jbuffington2104111Dietrich, William E.002Kirchner, James W.003This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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