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Ecological Issues in Floodplains and Riparian Corridors

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Ecological Issues in Floodplains and Riparian Corridors Final White Paper Research Project T1803 Task 29 Riparian Corridor ECOLOGICAL ISSUES IN FLOODPLAINS AND RIPARIAN CORRIDORS by Susan M. Bolton Jeff Shellberg Associate Professor and Director Research Assistant Center for Streamside Studies University of Washington, Bx 352100 Seattle, Washington 98195 Washington State Transportation Center (TRAC) University of Washington, Box 354802 University District Building 1107 NE 45th Street, Suite 535 Seattle, Washington 98105-4631 Washington State Department of Transportation Technical Monitor Patricia Lynch Environmental Affairs Prepared for Washington State Transportation Commission Department of Transportation and in cooperation with U.S. Department of Transportation Federal Highway Administration July 2001 TECHNICAL REPORT STANDARD TITLE PAGE 1. REPORT NO. 2. GOVERNMENT ACCESSION NO. 3. RECIPIENT'S CATALOG NO. WA-RD 524.1 4. TITLE AND SUBTITLE 5. REPORT DATE Ecological Issues in Floodplains and Riparian Corridors July 2001 6. PERFORMING ORGANIZATION CODE 7. AUTHOR(S) 8. PERFORMING ORGANIZATION REPORT NO. Susan M. Bolton and Jeff Shellberg 9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. Washington State Transportation Center (TRAC) University of Washington, Box 354802 11. CONTRACT OR GRANT NO. University District Building; 1107 NE 45th Street, Suite 535 Agreement T1803, Task 29 Seattle, Washington 98105-4631 12. SPONSORING AGENCY NAME AND ADDRESS 13. TYPE OF REPORT AND PERIOD COVERED Research Office Washington State Department of Transportation Final white paper Transportation Building, MS 47370 Olympia, Washington 98504-7370 14. SPONSORING AGENCY CODE James Toohey, Project Manager, 360-705-0885 15. SUPPLEMENTARY NOTES This study was conducted in cooperation with the U.S. Department of Transportation, Federal Highway Administration. 16. ABSTRACT This white paper examines and synthesizes the literature pertaining to the current state of knowledge on the physical and biological effects of alluvial river channelization, channel confinement, and various channel and floodplain modifications. It also examines and summarizes literature on the mitigation, rehabilitation and restoration of rivers affected by these human modifications. Data gaps in our current understanding of physical and biological process, the effects of human modifications, and appropriate rehabilitation or restoration techniques are also reviewed. The paper overviews ecological and habitat issues associated with streams and riparian zones in Washington State and the Pacific Northwest. The results of the literature review are documented in a synthesis of the ecological and habitat effects of channelization, channel confinement and construction. The physical and morphologic effects of channelization are first reviewed to highlight how habitat templates have been or potentially could be modified. Then, the responses of different groups of organisms (invertebrates, fish, plants, birds, mammals) that are dependent on functional riparian corridors are reviewed. Data gaps in our current knowledge in connecting cause and effects relationships in complex ecological systems are reviewed. The functional importance of hyporheic and perirheic zones in alluvial streams is also reviewed. The paper includes a section on habitat protection and mitigation techniques. Alternative management strategies such as passive (vs. active) restoration, streamside vegetation retention or promotion, and modified in-channel vegetation removal are reviewed. Recommendations by various authors on minimizing impacts during design and construction are also summarized. Preservation of channel morphology, incorporation of vegetation into embankments, and alternative bank protection techniques are also explored. In recent years there has been a societal push to rehabilitate and/or restore streams and rivers degraded by channel modifications. The paper ends with a review of large-scale rehabilitation and restoration projects and techniques in the literature. 17. KEY WORDS 18. DISTRIBUTION STATEMENT Floodplain, riparian, alluvial river channelization, No restrictions. This document is available to the channel confinement, restoration public through the National Technical Information Service, Springfield, VA 22616 19. SECURITY CLASSIF. (of this report) 20. SECURITY CLASSIF. (of this page) 21. NO. OF PAGES 22. PRICE None None WHITE PAPER Ecological Issues in Floodplains and Riparian Corridors Submitted to Washington Department of Fish and Wildlife Washington Department of Ecology Washington Department of Transportation Prepared by Susan Bolton and Jeff Shellberg University of Washington, Center for Streamside Studies July 11, 2001 DISCLAIMER The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Washington State Transportation Commission, Department of Transportation, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Ecological Issues in Floodplains and Riparian Corridors Contents Overview of Aquatic Habitat Guidelines Project .......................................................................... iii Assessment of the State of Knowledge............................................................................................1 Methods ....................................................................................................................................1 Overview of Ecological and Habitat Issues..............................................................................1 Basic Hydrology and Hydraulics ....................................................................................1 Basic Geomorphology.....................................................................................................2 Basic Riparian Ecology...................................................................................................3 Definitions of Stream Corridors and Channel Migration Zones.....................................4 Results of Literature Review on Ecological and Habitat Effects of Channelization................7 Channel Confinement and Construction.........................................................................7 Physical Effects of Channel Straightening......................................................................9 Physical Effects of Levees ............................................................................................10 Physical Effects of Clearing and Snagging including the Role of Large Woody Debris.....................................................................................................................10 Biological Effects of Channelization ............................................................................13 Requirements and Responses of Aquatic Invertebrates................................................14 Requirements and Response of Fish .............................................................................15 Requirements and Response of Plants ..........................................................................16 Requirements and Response of Birds ...........................................................................17 Requirements and Response of Mammals ....................................................................17 Off-site Consequences of Channelization.....................................................................18 Discussion/Data Gaps ...................................................................................................20 Hydrogeomorphic and Ecological Effects of Channel Confinement and Channelization on the Hyporheic and Perirheic Zones ...................................................20 Introduction to the Hyporheic and Perirheic Zones ......................................................20 Effects of Channel Confinement/Channelization on Hyporheic and Perirheic Zones......................................................................................................................27 Data Gaps......................................................................................................................31 Habitat Protection and Mitigation Techniques ..............................................................................33 Background.............................................................................................................................33 Streamside Vegetation Removal...................................................................................34 In-channel Vegetation Removal (Snagging).................................................................37 Natural Recovery/Passive Restoration..........................................................................39 Alternative Construction/Design Practices to Mitigate Impacts...................................41 Active Restoration and Rehabilitation Techniques.......................................................48 Data Gaps: Habitat Protection and Mitigation..............................................................58 References......................................................................................................................................59 Appendix A Complete Literature Database i Ecological Issues in Floodplains and Riparian Corridors Tables Table 1. Typical changes in channel attributes following shortening and straightening of the channel (after Brookes 1988) ....................................................................................9
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