Results From a Channel Restoration Project: Hydraulic Design Considerations
By: K.F. Karle and R.V. Densmore
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.
Suggested Citation
Karle, K., Densmore, R., 2001, Results From a Channel Restoration Project: Hydraulic Design Considerations, in Proceedings of the 2001 Wetlands Engineering and River Restoration Conference, Reno, NV, 27 August 2001 through 31 August 2001, p. 1127-1138.
| 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 |
| 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 |