A comparison of past small dam removals in highly sediment-impacted systems in the U.S.

Sawaske, Spencer R.; Freyberg, David L.

doi:10.1016/j.geomorph.2012.01.013

Cited by 69 publications

(89 citation statements)

References 24 publications

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“…Our data provide valuable insight on how a river evolves when nearly a century of a mixed grain size sediment deposit is exposed in two concurrent, phased dam removals in the same watershed. While published channel evolution models (Morris and Fan, 1998;Doyle et al, 2002;Pizzuto, 2002;Cannatelli and Curran, 2012) and empirical relationships (Sawaske and Freyberg, 2012) have already identified key physical processes and variables important in a dam removal, they were based on experience from small, mostly instantaneous dam removals that respond over short time frames. Previous studies highlight the need for incorporation of more quantitative data and large-scale dam removal cases to extend our understanding and help improve predictive capabilities and sediment management decisions for future dam removal cases.…”

Section: Discussionmentioning

confidence: 99%

Large-scale dam removal on the Elwha River, Washington, USA: Erosion of reservoir sediment

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Large-scale dam removal on the Elwha River, Washington, USA: Erosion of reservoir sediment

et al. 2015

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“…Despite the number of dams being removed nationwide, few studies have systematically evaluated the effects of dam removal on rivers and their ecosystems. The few existing geomorphic studies of dam removals mainly report on removals of small dams and do not span a wide range of river types, sediment releases, or sediment compositions (Doyle and others, 2003a;Ahearn and Dahlgren, 2005;MacBroom, 2005;Cheng and Granata, 2007;Evans, 2007;Rumschlag and Peck, 2007;Straub, 2007;Walter and Tullos, 2010;Pearson and others, 2011;Sawaske and Freyberg, 2012). …”

Section: ; Us Army Corps Of Engineers 2009)mentioning

confidence: 99%

Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam

Major¹,

O'Connor²,

Podolak³

et al. 2012

Professional Paper

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This report and any updates to it are available online at: http://pubs.usgs.gov/pp/1792/ 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://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Suggested citation: Major, J.J., O'Connor, J.E., Podolak, C.J., Keith, M.K., Grant, G.E., Spicer, K.R., Pittman, S., Bragg, H.M., Wallick, J.R., Tanner, D.Q., Rhode, A., and Wilcock, P.R., 2012, Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam: U.S. Geological Survey Professional Paper 1792, 64 p.Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. Altitude, as used in this report, refers to distance above the vertical datum.Concentrations of suspended sediment in water are given in milligrams per liter (mg/L). MultiplyBy To obtain Mass AbstractThe October 2007 breaching of a temporary cofferdam constructed during removal of the 15-meter (m)-tall Marmot Dam on the Sandy River, Oregon, triggered a rapid sequence of fluvial responses as ~730,000 cubic meters (m 3 ) of sand and gravel filling the former reservoir became available to a high-gradient river. Using direct measurements of sediment transport, photogrammetry, airborne light detection and ranging (lidar) surveys, and, between transport events, repeat ground surveys of the reservoir reach and channel downstream, we monitored the erosion, transport, and deposition of this sediment in the hours, days, and months following breaching of the cofferdam.Rapid erosion of reservoir sediment led to exceptional suspended-sediment and bedload-sediment transport rates near the dam site, as well as to elevated transport rates at downstream measurement sites in the weeks and months after breaching. Measurements of sediment transport 0.4 kilometers (km) downstream of the dam site during and following breaching show a spike in the transport of fine suspended sediment within minutes after breaching, followed by high rates of suspended-load and bedload transport of sand. Significant transport of gravel bedload past the measurement site did not begin until 18 to 20 hours after breaching. For at least 7 months after breaching, bedload transport rates just below the dam site during high flows remained as much as 10 times above rates measured upstream of the dam site and farther downstream.

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“…Most of the N1100 dams removed in the United States thus far (American Rivers, 2014) have been b10 m high and impounded modest volumes (b1 million m 3 ) of reservoir sediment (e.g., Cheng and Granata, 2007;Burroughs et al, 2009;Pearson et al, 2011;Sawaske and Freyberg, 2012). Within the past decade, several larger dam removals have provided substantially more information to scientists and managers concerning the physical and biological responses to such events.…”

Section: Introductionmentioning

confidence: 99%

Large-scale dam removal on the Elwha River, Washington, USA: River channel and floodplain geomorphic change

et al. 2015

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A comparison of past small dam removals in highly sediment-impacted systems in the U.S.

Cited by 69 publications

References 24 publications

Large-scale dam removal on the Elwha River, Washington, USA: Erosion of reservoir sediment

Large-scale dam removal on the Elwha River, Washington, USA: Erosion of reservoir sediment

Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam

Large-scale dam removal on the Elwha River, Washington, USA: River channel and floodplain geomorphic change

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