Assessment of Methods for Monitoring Responses to River Restoration: Riverbed and Channel Form Changes

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Title: Assessment of Methods for Monitoring Responses to River Restoration: Riverbed and Channel Form Changes
Author: Tu, Denise Shao-Wai
Abstract: On the Middle Fork John Day River (MFJD), a low gradient, meandering river in eastern Oregon, restoration includes engineered log structures intended to increase in-stream complexity and habitat diversity. Effects of log structures on riverbed topography can be captured through repeat topographic surveys, digital elevation model (DEM) of differencing (DoD), and aerial imagery. This study evaluates the (1) potential for remote sensing analysis, (2) effect of survey point density on DEMs, and (3) application of DoDs, in monitoring riverbed changes in the MFJD. An average point spacing and density finer than 0.50m and 1.25pts/m<super>2</super> captures riverbed complexities. Although elevation changes were expected to be minimal, DoDs revealed -0.9 to 0.5m elevation changes associated with log structure designs. Incorporating numerical thresholds into future monitoring survey methods will improve the modeling of MFJD riverbed surfaces. Monitoring riverbed changes through DoDs can inform improvements to future restoration design and the effectiveness of log structures.
Description: xi, 54 p. : ill. (some col.)
URI: http://hdl.handle.net/1794/11505
Date: 2011-06


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