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Open-File Report 2012–1240

Prepared in cooperation with Seattle Public Utilities

Geomorphic and Hydrologic Study of Peak-Flow Management of the Cedar River, Washington

By Christopher S. Magirl, Andrew S. Gendaszek, Christiana R. Czuba, Christopher P. Konrad, and Mathieu D. Marineau

Thumbnail of and link to report PDF (55 KB)Abstract

Assessing the linkages between high-flow events, geomorphic response, and effects on stream ecology is critical to river management. High flows on the gravel-bedded Cedar River in Washington are important to the geomorphic function of the river; however, high flows can deleteriously affect salmon embryos incubating in streambed gravels. A geomorphic analysis of the Cedar River showed evidence of historical changes in river form over time and quantified the effects of anthropogenic alterations to the river corridor. Field measurements with accelerometer scour monitors buried in the streambed provided insight into the depth and timing of streambed scour during high-flow events. Combined with a two-dimensional hydrodynamic model, the recorded accelerometer disturbances allowed the prediction of streambed disturbance at the burial depth of Chinook and sockeye salmon egg pockets for different peak discharges. Insight gained from these analyses led to the development of suggested monitoring metrics for an ongoing geomorphic monitoring program on the Cedar River.

First posted November 27, 2012

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey
934 Broadway, Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov/

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Suggested citation:

Magirl, C.S., Gendaszek, A.S., Czuba, C.R., Konrad, C.P., and Marineau, M.D., 2012, Geomorphic and hydrologic study of peak-flow management on the Cedar River, Washington: U.S. Geological Survey Open-File Report 2012-1240, 4 p., plus presentation.



Contents

Abstract

Introduction

Summary and Conclusions

References Cited


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