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Geophysical Monograph Series

 

Keywords

  • restoration
  • hydroecology
  • dams
  • management
  • dominant discharge
  • ecohydraulics

Index Terms

  • 1813 Hydrology: Eco-hydrology
  • 1821 Hydrology: Floods
  • 1625 Global Change: Geomorphology and weathering

Article

GEOPHYSICAL MONOGRAPH SERIES, VOL. 194, PP. 247-261, 2011

Quantitatively Evaluating Restoration Scenarios for Rivers With Recreational Flow Releases

Martin W. Doyle

Department of Geography, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA


Randall L. Fuller

Department of Biology, Colgate University, Hamilton, New York, USA


Rivers worldwide have been drastically altered in terms of hydrology and morphology. To date, restoration has focused heavily on channel design (i.e., channel morphology), despite the well-known importance of flow regime on controlling ecological processes. In addition, there are few quantitative tools with which to directly and quantitatively compare alternative restoration scenarios. Here we leverage the ecological dominant discharge approach to develop a simple method for quantitatively comparing the effect of different restoration strategies on an ecological metric, in-stream hydraulic habitat (i.e., limiting depths and velocities of flow for fish). We apply this approach to the case of a river ecosystem impacted by recreational flow releases. The analysis shows that enhancing channel morphology will result in limited ecological gains and that greater habitat could be gained through changes in the hydrologic regime. Greater quantitative tools are needed for directly comparing the potential ecological gains of different restoration approaches, and these tools should be usable during the initial evaluation stages of a restoration project; our approach provides a starting point in this direction.

Citation: Doyle, M. W., and R. L. Fuller (2011), Quantitatively evaluating restoration scenarios for rivers with recreational flow releases, in Stream Restoration in Dynamic Fluvial Systems: Scientific Approaches, Analyses, and Tools, Geophys. Monogr. Ser., vol. 194, edited by A. Simon, S. J. Bennett and J. M. Castro, pp. 247–261, AGU, Washington, D. C., doi:10.1029/2010GM000958.

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