Quantifying the benthic source of nutrients to the water column of Upper Klamath Lake, Oregon

James S. Kuwabara; Dennis D. Lynch; Brent R. Topping; Fred Murphy; James L. Carter; Nancy S. Simon; Francis Parcheso; Tamara M. Wood; Mary K. Lindenberg; Katryn Wiese; Ronald J. Avanzino

doi:10.3133/ofr20071276

Quantifying the Benthic Source of Nutrients to the Water Column of Upper Klamath Lake, Oregon

Open-File Report 2007-1276

Prepared in cooperation with the U.S. Bureau of Reclamation

By: James S. Kuwabara, Dennis D. Lynch, Brent R. Topping, Fred Murphy, James L. Carter, Nancy S. Simon, Francis Parcheso, Tamara M. Wood, Mary K. Lindenberg, Katryn Wiese, and Ronald J. Avanzino

https://doi.org/10.3133/ofr20071276

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Abstract

Executive Summary Five sampling trips were coordinated in April, May and August 2006, and May and July 2007 to sample the water column and benthos of Upper Klamath Lake, OR (Fig. 1; Table 1), before, during and after the annual cyanophyte bloom of Aphanizomenon flos-aquae (AFA). A pore-water profiler was designed and fabricated to obtain the first high-resolution (centimeter-scale) estimates of the vertical concentration gradients for diffusive-flux determinations. Estimates based on molecular diffusion may underestimate benthic flux because solute transport across the sediment-water interface can be enhanced by processes including bioturbation, bioirrigation and ground-water advection. Water-column and benthic samples were also collected to help interpret spatial and temporal trends in diffusive-flux estimates. Data from these samples complement geochemical analyses of bottom-sediments taken from Upper Klamath Lake (UKL) in 2005. This ongoing study provides information necessary for developing process-interdependent solute-transport models for the watershed (that is, models integrating physical, geochemical and biological processes), and supports efforts to evaluate remediation or load-allocation strategies. To augment studies funded by the U.S. Bureau of Reclamation (USBR), the Department of Interior supported an additional full deployment of pore-water profilers in July 2007, during the summer AFA bloom. Results from this recent field trip are not fully completed. Data not presented herein will be included in a subsequent publication, scheduled for March 2009.

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Additional publication details
Publication type	Report
Publication Subtype	USGS Numbered Series
Title	Quantifying the benthic source of nutrients to the water column of Upper Klamath Lake, Oregon
Series title	Open-File Report
Series number	2007-1276
DOI	10.3133/ofr20071276
Year Published	2007
Language	English
Publisher	U.S. Geological Survey
Publisher location	Reston, VA
Contributing office(s)	Toxic Substances Hydrology Program, U.S. Geological Survey
Description	39 p.
Country	United States
State	Oregon
Other Geospatial	Upper Klamath Lake
Google Analytic Metrics	Metrics page