Hydrobiologia

, Volume 719, Issue 1, pp 527–545 | Cite as

Restoring mediterranean-climate rivers

  • G. Mathias Kondolf
  • Kristen Podolak
  • Theodore E. Grantham
MEDITERRANEAN CLIMATE STREAMS Review paper

Abstract

Mediterranean-climate rivers (med-rivers) have highly variable flow regimes, with large, periodic floods shaping the (often-braided) channels, which is different from stable humid-climate rivers, whose form may be dominated by the 1.5-year flood. There is a fundamental challenge in attempting to “restore” such variable, ever-changing, dynamic river systems, and the most effective restoration strategy is to set aside a channel migration zone within which the river can flood, erode, deposit, and migrate, without conflicting with human uses. An apparent cultural preference for stable channels has resulted in attempts to build idealized meandering channels, but these are likely to wash out during large, episodic floods typical of med-rivers. Med-rivers are more extensively dammed than their humid-climate counterparts, so downstream reaches are commonly deprived of high flows, which carry sediments, modify channel morphology, and maintain habitat complexity. Restoration of the entire pre-dam hydrograph without losing the benefits of the dam is impossible, but restoration of specific components of the natural hydrograph (to which native species are adapted) can restore some ecosystem components (such as native fish species) in med-rivers.

Keywords

Episodic channels Mediterranean climate Variable flow regime River restoration Channel migration zone 

Notes

Acknowledgments

This manuscript was based on research supported by the Portuguese Studies Program and Beatrix Farrand Fund of the University of California, Berkeley. The manuscript was substantially improved in response to comments from two anonymous reviewers and editors of the special issue, thanks to improvements to the figures by Jen Natali, and suggested edits from Syd Brown and Patrick Vaughn of California State Parks.

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • G. Mathias Kondolf
    • 1
  • Kristen Podolak
    • 1
  • Theodore E. Grantham
    • 2
  1. 1.Department of Landscape Architecture & Environmental PlanningUniversity of CaliforniaBerkeleyUSA
  2. 2.Center for Watershed SciencesUniversity of CaliforniaDavisUSA

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