Abstract
Retrofitting a large flood control dam on the South Fork McKenzie River, Oregon, USA with a temperature control structure required drawdown of Cougar Reservoir. The drawdown initiated incision of the reservoir delta that had developed in the 40 years since Cougar Dam was constructed. Remobilization of deltaic sediments resulted in a sustained release of turbid water from Cougar Reservoir, prompting concern that sediment contained within the turbidity plume might intrude into river gravels, with potentially negative effects for fish and other aquatic biota. We sampled gravels both upstream and downstream of Cougar Dam and on the mainstem McKenzie River both above and below the confluence with the South Fork to compare affected gravels to unaffected gravels. The results suggest that intrusion of very fine clays into gravel substrate can occur even when the clay is carried as wash load.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Beschta RL, Jackson WL (1979) The intrusion of fine sediments into a stable gravel bed. J Fish Res Board Can 36(2):204–210
Carling PA (1984) Deposition of fine and coarse sand in an open–work gravel bed. Can J Fish Aquat Sci 41(3):263–270
Einstein HA (1968) Deposition of suspended particles in a gravel bed. J Hydraul Div ASCE 94(5):1197–1205
Koltermann CE, Gorelick SM (1995) Fractional packing model for hydraulic conductivity derived from sediment mixtures. Water Resour Res 31(12):3283–3297
Richards C, Bacon KL (1994) Influence of fine sediment on macroinvertebrate colonization of surface and hyporheic stream substrates. Great Basin Nat 54(2):106–113
Schalchli U (1995) Basic equations for siltation of riverbeds. J Hydraul Eng 121(3):274–287
Wu FC (2000) Modeling embryo survival affected by sediment deposition into salmonid spawning gravels: application to flushing flow prescriptions. Water Resour Res 36(6):1595–1603
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Grant, G.E., Lewis, S.L., Stewart, G., Reed Glasmann, J. (2015). Sediment Problems and Consequences During Temporary Drawdown of a Large Flood Control Reservoir for Environmental Retrofitting. In: Lollino, G., Arattano, M., Rinaldi, M., Giustolisi, O., Marechal, JC., Grant, G. (eds) Engineering Geology for Society and Territory - Volume 3. Springer, Cham. https://doi.org/10.1007/978-3-319-09054-2_6
Download citation
DOI: https://doi.org/10.1007/978-3-319-09054-2_6
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-09053-5
Online ISBN: 978-3-319-09054-2
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)