Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13

Schenk, Liam N.; Bragg, Heather M.

doi:10.3133/ofr20141114

Cited by 12 publications

(9 citation statements)

References 11 publications

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“…Where transport capacity is low relative to sediment supply, the deposition can be persistent. For example, in some low-velocity, off-channel areas of Fall Creek and Middle Fork Willamette River, fine sediments released from annual drawdowns at Fall Creek Reservoir have deposited and remained stable despite multiple high-flow events (Schenk and Bragg, 2014;Bangs and others, 2015;16;Keith and others, 2017). Evaluating current patterns of bedmaterial texture and monitoring future changes are critical for determining whether environmental flow releases could be implemented to minimize negative effects such as armoring in main channel habitats and excessive fine sediment aggradation in off-channel habitats.…”

Section: Approaches For Monitoring Bed-materials Texturementioning

confidence: 99%

Monitoring framework for evaluating hydrogeomorphic and vegetation responses to environmental flows in the Middle Fork Willamette, McKenzie, and Santiam River Basins, Oregon

Wallick¹,

Bach²,

Keith³

et al. 2018

Open-File Report

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For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.

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Section: Approaches For Monitoring Bed-materials Texturementioning

confidence: 99%

Monitoring framework for evaluating hydrogeomorphic and vegetation responses to environmental flows in the Middle Fork Willamette, McKenzie, and Santiam River Basins, Oregon

Wallick¹,

Bach²,

Keith³

et al. 2018

Open-File Report

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“…These averaged unit values were paired with either the individual samples or the averaged A and B sets (where applicable) to generate the calibration dataset. Methods for model selection follow those in Rasmussen and others (2009) and Schenk and Bragg (2014). Simple linear regressions (SLRs) and multiple linear regressions (MLRs) were evaluated to compute SSC, and log 10 transformation was applied to variables where appropriate to make model residuals more symmetric, linear, and homoscedastic.…”

Section: Surrogate Regression Methodsmentioning

confidence: 99%

“…However, turbidity is largely affected by particle density, size distribution, and composition, and experience has shown that it can be an excellent surrogate for suspended sediment, among other parameters (Lewis, 1996;others, 2008, 2009). Turbidity as a surrogate has been used to calculate suspended-sediment concentration (SSC) in the Wilson and Trask River Basins in northwestern Oregon (Sobieszczyk and others, 2015), in the Santiam River Basin (Bragg and others, 2007), in the Middle Fork Willamette River Basin (Schenk and Bragg, 2014), and in the McKenzie River (Anderson, 2007). Similar to the use of in-place turbidity measurement as a surrogate for SSC, acoustic backscatter data collected as ancillary data for the calculation of streamflow from acoustic Doppler velocity meters (ADVMs) also have been shown to be a useful surrogate for suspended sediment and P in some systems (Medalie and others, 2014).…”

Section: Introduction Backgroundmentioning

confidence: 99%

Evaluating external nutrient and suspended-sediment loads to Upper Klamath Lake, Oregon, using surrogate regressions with real-time turbidity and acoustic backscatter data

Schenk¹,

Anderson²,

Diaz³

et al. 2016

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov/.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Schenk, L.N., Anderson, C.W., Diaz, Paul, and Stewart, M.A., 2016, Evaluating external nutrient and suspendedsediment loads to Upper Klamath Lake, Oregon, using surrogate regressions with real-time turbidity and acoustic backscatter data: U.S. Geological Survey Scientific Investigations Report 2016-5167, 46 p., https://doi.org/10.3133/ sir20165167. DatumsVertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88) unless otherwise noted.Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).Elevation, as used in this report, refers to distance above the vertical datum. Executive SummarySuspended-sediment and total phosphorus loads were computed for two sites in the Upper Klamath Basin on the Wood and Williamson Rivers, the two main tributaries to Upper Klamath Lake. High temporal resolution turbidity and acoustic backscatter data were used to develop surrogate regression models to compute instantaneous concentrations and loads on these rivers. Regression models for the Williamson River site showed strong correlations of turbidity with total phosphorus and suspended-sediment concentrations (adjusted coefficients of determination [Adj R 2 ]=0.73 and 0.95, respectively). Regression models for the Wood River site had relatively poor, although statistically significant, relations of turbidity with total phosphorus, and turbidity and acoustic backscatter with suspended sediment concentration, with high prediction uncertainty. Total phosphorus loads for the partial 2014 water year (excluding October and November 2013) were 39 and 28 metric tons for the Williamson and Wood Rivers, respectively. These values are within the low range of phosphorus loads computed for these rivers from prior studies using water-quality data collected by the Klamath Tribes. The 2014 partial year total phosphorus loads on the Williamson and Wood Rivers are assumed to be biased low because of the absence of data from the first 2 months of water year 2014, and the drought conditions that were prevalent during that water year. Therefore, total phosphorus and suspended-sediment loads in this report should be considered as representative of a low-water year for the two study sites. Comparing loads from the Williamson and Wood River monitoring sites for November 2013-September 2014 show...

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“…By fully opening a dam outlet (e.g., gate valve), removing a physical barrier and temporarily converting the lentic reservoir into a lotic river, draining to streambed could improve the ability of juvenile salmon to locate the reservoir outlet and to pass downstream with minimal obstruction, high survival and without handling. This is effectively reservoir flushing, and may be accompanied by a washout of sediments (Schenk & Bragg, ) as well as other fish species. Although there is some history of draining for passage and dam maintenance (Anderson, ), this strategy has not previously been evaluated for short‐ and longer‐term impacts to the reservoir community.…”

Section: Introductionmentioning

confidence: 99%

Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

et al. 2019

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Fish passage out of reservoirs is a critical issue for downstream movement of juvenile salmonids and other migratory species. Reservoirs can delay downstream migrations by juvenile salmon for months or years. Here, we examine whether a novel management activity implementing annual short‐term draining of a reservoir to streambed improves timely downstream migration of juvenile salmonids. We analyse 12 years of fish capture data from a screw trap located downstream of Fall Creek Reservoir (Oregon, USA) to examine changes in timing of passage out of the reservoir and to compare fish species composition pre‐ and post‐draining. We observed a contraction in the timing of downstream migration for juvenile Chinook Salmon and reduction of yearlings in years following draining. We suggest that briefly draining the reservoir to streambed leads to reduced abundance of warm‐water invasive fishes in the reservoir after it refills. These changes could decrease predation and shift competition between invasive and resident riverine‐adapted native fishes in the reservoir. Collectively, our findings suggest that this low‐cost reservoir management option may improve passage and connectivity for juvenile Chinook Salmon while also decreasing the abundance of invasive fish species in the reservoir. This case study underscores the crucial need for further evaluations of reservoir draining in other systems and contexts.

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Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13

Abstract: rapid fouling of the probe by the large amount of sediment in transport. Dissolved oxygen returned to background levels downstream of Fall Creek Dam on December 18, 2012, approximately 1 day after the end of the drawdown operation.

Cited by 12 publications

References 11 publications

Monitoring framework for evaluating hydrogeomorphic and vegetation responses to environmental flows in the Middle Fork Willamette, McKenzie, and Santiam River Basins, Oregon

Monitoring framework for evaluating hydrogeomorphic and vegetation responses to environmental flows in the Middle Fork Willamette, McKenzie, and Santiam River Basins, Oregon

Evaluating external nutrient and suspended-sediment loads to Upper Klamath Lake, Oregon, using surrogate regressions with real-time turbidity and acoustic backscatter data

Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

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