Abstract
River channel migration and cutoff events within large river riparian corridors create heterogeneous and biologically diverse landscapes. However, channel stabilization (riprap and levees) impede the formation and maintenance of riparian areas. These impacts can be mitigated by setting channel constraints away from the channel. Using a meander migration model to measure land affected, we examined the relationship between setback distance and riparian and off-channel aquatic habitat formation on a 28-km reach of the Sacramento River, California, USA. We simulated 100 years of channel migration and cutoff events using 11 setback scenarios: 1 with existing riprap and 10 assuming setback constraints from about 0.5 to 4 bankfull channel widths (bankfull width: 235 m) from the channel. The percentage of land reworked by the river in 100 years relative to current (riprap) conditions ranged from 172% for the 100-m constraint setback scenario to 790% for the 800-m scenario. Three basic patterns occur as the setback distance increases due to different migration and cutoff dynamics: complete restriction of cutoffs, partial restriction of cutoffs, and no restriction of cutoffs. Complete cutoff restriction occurred at distances less than about one bankfull channel width (235 m), and no cutoff restriction occurred at distances greater than about three bankfull widths (∼700 m). Managing for point bars alone allows the setbacks to be narrower than managing for cutoffs and aquatic habitat. Results suggest that site-specific “restriction of cutoff” thresholds can be identified to optimize habitat benefits versus cost of acquired land along rivers affected by migration processes.
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Acknowledgments
This research was conducted under CALFED grant ERP 99-N18. Insightful review comments by P. Diplas, N. Allmendinger, and an anonymous reviewer improved the manuscript. We also gratefully acknowledge the review contributions of Daniel Efseaff, Steve Greco, Lisa Micheli, and Alex Young. We gratefully acknowledge Brian Morgan for help with the figures and Kathleen Wong for editorial assistance. We gratefully acknowledge the unfailing inspiration and continued support of Stacy Cepello, of the California Department of Water Resources, without whom this work would have been impossible. The first author acknowledges Harry K. Roberts.
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Larsen, E.W., Girvetz, E.H. & Fremier, A.K. Assessing the Effects of Alternative Setback Channel Constraint Scenarios Employing a River Meander Migration Model. Environmental Management 37, 880–897 (2006). https://doi.org/10.1007/s00267-004-0220-9
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DOI: https://doi.org/10.1007/s00267-004-0220-9