2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/05/2017  |   11:45 AM - 12:00 PM   |  SMALL FLOW OBSTRUCTIONS IMPLICATED IN ACCELERATING WHOLE-FLOODPLAIN SIDE-CHANNEL LOSS   |  302B

SMALL FLOW OBSTRUCTIONS IMPLICATED IN ACCELERATING WHOLE-FLOODPLAIN SIDE-CHANNEL LOSS

Side-channel extents influence the diversity and structure of riverine communities. Side channels are dynamic geomorphic features that persist in floodplain landscapes when gross rates of side-channel creation and loss are balanced. Although riprap and other linear structures are well-recognized impediments to side-channel creation, we hypothesized that other types of “anthropogenic plugs” (flow obstructions such as dikes or berms) built across side channels facilitate side-channel loss at a whole-river scale. We quantified longitudinal patterns of gross creation and loss of side-channel areas between the 1950s and 2001 using digitized aerial photographs along >500 km of the Yellowstone River. We then related these patterns to the longitudinal variation in the frequency of anthropogenic side-channel plugs. Consistent with our hypothesis, the frequency of anthropogenic plugs was positively correlated with gross side-channel loss, but not with gross side-channel creation. Because they are relatively inconspicuous, anthropogenic plugs may be a largely overlooked but important management concern for the evolution and maintenance of channel habitats.

  • C27 Landuse and Non-Point source Impacts
  • C06 Large River Ecology
  • C14 Hydroecology & C33 Remote Sensing

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Presenters/Authors

Ann Marie Reinhold (), Montana State University, Montana Institute on Ecosystems, reinhold@montana.edu;


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Geoffrey Poole (), Montana State University, Montana Institute on Ecosystems, gpoole@montana.edu ;


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Robert Bramblett (), Montana State University, bbram@montana.edu;


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Alexander Zale (), U.S. Geological Survey, Montana Cooperative Fishery Research Unit, zale@montana.edu;


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David Roberts (), Montana State University, droberts@montana.edu;


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