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Article
Linking geomorphic changes to salmonid habitat at a scale relevant to fish
River Research and Applications (2010)
  • Joseph M. Wheaton, Utah State University
  • James Brasington
  • Stephen E. Darby
  • Joseph E. Merz
  • Gregory B. Pasternack
  • David A. Sear
  • Damia Vericat
Abstract

The influence of geomorphic change on ecohydraulics has traditionally been difficult to quantify. With recent improvements in surveying technology, high-resolution, repeat and topographic surveys have become a common tool for estimating fluvial sediment budgets and documenting spatial patterns of net erosion and net deposition. Using a case study from a spawning habitat rehabilitation (SHR) project on California's Mokelumne River, some new DEM-differencing analytical tools and ecohydraulic models were used to test whether hypotheses about pool-riffle maintenance mechanisms used in designing SHR projects were producing self-sustaining spawning habitat when subjected to competent flows. Following peak flows associated with the spring snow-melt, a total of 999.6 m3 of erosion and 810.1 m3 of deposition were recorded throughout the study area, with a net loss of 196.2 m3. Using an ecohydraulic spawning habitat suitability model to segregate the sediment budget, over 53% of the area in which gravel was placed in a 2005 SHR retained the same habitat quality characteristics, and 22% improved...

Keywords
  • DEM of difference (DoD);ecohydraulics;fluvial geomorphology;morphological method;Mokelumne River;CA
Publication Date
May, 2010
Citation Information
2010. Wheaton JM, Brasington J, Darby SE†, Merz JE, Pasternack GB†, Sear DA† and Vericat D‡. Linking Geomorphic Changes to Salmonid Habitat at a Scale Relevant to Fish. River Research and Applications. 25: 469-­‐486. DOI: 10.1002/rra.1305.