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Last modified
7/14/2009 5:02:29 PM
Creation date
5/22/2009 12:30:53 PM
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UCREFRP
UCREFRP Catalog Number
7104
Author
Green, B. and M. Butler.
Title
Analysis of Channel Maintenance and Flushing Flows in the Colorado River at the Palisade Habitat Site (Appendix B).
USFW Year
1987.
USFW - Doc Type
\
Copyright Material
NO
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<br />)(vf")( --\\~J ~,,~~' <br />~\. \ <br /> <br />~ <br /> <br />Method <br /> <br />Milhous (1986) evaluates three method: shing flow <br />requirements (Tennant, Hoppe and effe( finds <br />them unsatisfactory because they do no cal <br />processes that affect the condition of suggests <br />an alternate method based upon the dimt__..,u~ess Shields parameter <br />and the d50 material size. Milhous uses the term Beta movement <br />parameter to distinguish it from the Shields parameter. The <br />Shields parameter describes forces sufficient to move the bed as <br />opposed to smaller forces required to flush fines from the bed <br />material. The Beta movement parameter is defined as <br /> <br />Beta = RS <br />(Gs-l)d50 <br /> <br />Where: R - hydraulic radiu~ ~ e v~} <br />w s E. + \f / _ W ~ +:;:-. <br />S energy slope ~ ~ <br />I ~-+-:cl <br />G - specific gravity of bed mater1al <br />s <br />d50 - median size of bed surface material <br /> <br />(armor layer) <br /> <br />A Beta movement parameter of 0.021 is required to flush fine <br />sediment from an armored stream and a value of 0.035 is needed if <br />the streambed is paved. The absolute minimum value for an armored <br />\ stream is 0.017 (Personal Communication, R. Milhous, July 7, 1987). <br />A movement parameter of 0.021 was selected as being necessary to <br />. <br />flush fines from the surface to the one-half diameter of the cobble <br />substrate at the Palisades site. ,Field studies at Oak Creek, <br />Oregon, which has substrate characteristics similar to the <br />Palisades site, support selection of a movement parameter of 0.021 <br />(Milhous, 1973). <br /> <br />5 <br />
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