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    Author(s): Robert H. Hilderbrand; A. Dennis Lemly; C. Andrew Dolloff; Kelly L. Harpster
    Date: 1998
    Source: North American Journal of Fisheries Management. 18: 161-167.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (225 B)


    Log length exerted a critical influence in stabilizing large woody debris (LWD) pieces added as an experimental stream restoration technique. Logs longer than the average bank-full channel width (5.5 m) were significantly less likely to be displaced than logs shorter than this width. The longest log in stable log groups was significantly longer than the longest log in unstable groups. The distances moved by displaced logs demonstrated a quadratic relationship associated with log length; longer logs moved less often, but they moved farther when entrained in the current than the majority of mobile smaller logs. Log stability did not differ between a treatment section with randomized placement of LWD and a section in which LWD was placed systematically to best modify channel habitats. Channel scouring typically occurred around LWD oriented as ramps and as dams perpendicular to stream flow; aggradation occurred above and below pieces oriented as dams angled to the current. Microscale channel responses to LWD additions varied

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    Hilderbrand, Robert H.; Lemly, A. Dennis; Dolloff, C. Andrew; Harpster, Kelly L. 1998. Design considerations for large woody debris placement in stream enhancement projects. North American Journal of Fisheries Management. North American Journal of Fisheries Management. 18: 161-167.

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