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Scientific Investigations Report 2013–5016


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Prepared in cooperation with the Bureau of Reclamation


Macrophyte and pH Buffering Updates to the Klamath River Water-Quality Model Upstream of Keno Dam, Oregon


By Annett B. Sullivan, Stewart A. Rounds, Jessica R. Asbill-Case, and Michael L. Deas

Figures

Figure 1. Location of the study reach and sampling locations in Link River to Keno Dam reach of the Klamath River, Oregon. WWTP, wastewater treatment plant.

Figure 2. Mid-channel Secchi depth for the June (June 27–July 7), August (August 15–19), and October (October 11–13) 2011 macrophyte sampling events in the Link River to Keno Dam reach of the Klamath River, Oregon.

Figure 3. Estimated dry weight biomass for the most commonly identified macrophytes at June (June 27–July 7), August (August 15–19), and October (October 11–13) 2011 sampling events in the Link River to Keno Dam reach of the Klamath River, Oregon.

Figure 4. Summation of site densities for two hypothetical Gaussian distributions of pKa values.

Figure 5. Example titration curves of four theoretical titration curves and measured data from the Link River to Keno Dam reach of the Klamath River, Oregon.

Figure 6. Modeled macrophyte biomass along the Link River to Keno Dam reach of the Klamath River, Oregon, on two selected dates.

Figure 7. Modeled daily average dissolved-oxygen production sources and consumption sinks in the Link River to Keno Dam reach of the Klamath River, Oregon, in 2008.

Figure 8. Modeled and measured pH at the Klamath River, Oregon, Railroad Bridge site in summer and fall 2007, without and with the new enhanced CE-QUAL-W2 pH buffering.

Figure 9. Modeled and measured pH at the Klamath River, Oregon, Keno site in summer and fall 2007, without macrophytes and with macrophytes.

Figure 10. Measured and modeled hourly pH during calendar years 2006, 2007, 2008, and 2009 for sites in the Link River to Keno Dam reach of the Klamath River, Oregon.

Figure 11. Measured and modeled hourly dissolved-oxygen concentrations during calendar years 2006, 2007, 2008, and 2009 for sites in the Link River to Keno Dam reach of the Klamath River, Oregon.

Figure 12. Measured and modeled algae, nutrients, organic matter, and bottom sediment during calendar years 2006, 2007, 2008, and 2009 for sites in the Link River to Keno Dam reach of the Klamath River, Oregon.

First posted March 1, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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