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Results From a Channel Restoration Project: Hydraulic Design Considerations

By:
,
Edited by:
Hayes D.F.Hayes D.F.

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Abstract

Techniques for the hydraulic restoration of placer-mined streams and floodplains were developed in Denali National Park and Preserve, Alaska. The two-year study at Glen Creek focused on a design of stream and floodplain geometry using hydraulic capacity and shear stress equations. Slope and sinuosity values were based on regional relationships. Design requirements included a channel capacity for a bankfull discharge and a floodplain capacity for a 1.5- to 100-year discharge. Several bio-engineering techniques using alder and willow, including anchored brush bars, streambank hedge layering, seedlings, and cuttings, were tested to dissipate floodwater energy and encourage sediment deposition until natural revegetation stabilized the new floodplains. Permanently monumented cross-sections installed throughout the project site were surveyed every one to three years. Nine years after the project began, a summer flood caused substantial damage to the channel form, including a change in width/depth ratio, slope, and thalweg location. Many of the alder brush bars were heavily damaged or destroyed, resulting in significant bank erosion. This paper reviews the original hydraulic design process, and describes changes to the channel and floodplain geometry over time, based on nine years of cross-section surveys.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Results From a Channel Restoration Project: Hydraulic Design Considerations
ISBN:
0784405816
Year Published:
2001
Language:
English
Larger Work Title:
Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
First page:
1127
Last page:
1138
Number of Pages:
12
Conference Title:
Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
Conference Location:
Reno, NV
Conference Date:
27 August 2001 through 31 August 2001