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COARSE WOODY DEBRIS AND CHANNEL MORPHOLOGY: A FLUME STUDY 1
Author(s) -
Cherry J.,
Beschta R.L.
Publication year - 1989
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1989.tb05417.x
Subject(s) - flume , large woody debris , streams , debris , channel (broadcasting) , hydrology (agriculture) , environmental science , debris flow , flow (mathematics) , geotechnical engineering , geology , river morphology , stream restoration , bank , riparian zone , sediment , geomorphology , habitat , geometry , ecology , engineering , computer network , oceanography , mathematics , computer science , electrical engineering , biology
In recent years, logs and other structures have been added to streams for the purposes of altering channel morphology to improve fish habitat. This flume study was conducted to evaluate the effects of coarse woody debris on local channel morphology. Wooden dowels were used to simulate the effects of individual logs in a stream, and scour depth and surface area were determined at the end of each test run. The maximum scour depth was significantly correlated (90 percent confidence level) with both the vertical orientation of the dowels and the channel opening ratio; the scour surface area was significantly correlated (90 percent confidence level) with both the flow depth and the vertical orientation. Upstream‐oriented dowels caused relatively large streambed scour and also deflected flows toward the streambank. Downstream‐oriented dowels generally caused less bed scour and appeared to provide better bank protection because flow was generally deflected from the bank. In conjunction with data from field studies, these results provide information on the effects of orientation, hydraulic function, and relative stability of coarse woody debris in streams.