Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon

G. E. Grant, J. D.G. Marr, C. Hill, S. Johnson, K. Campbell, O. Mohseni, J. R. Wallick, S. L. Lewis, J. E. O'Connor, J. J. Major, B. K. Burkholder

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

A key issue faced in dam removal is the rate and timing of remobilization and discharge of stored reservoir sediments following the removal. Different removal strategies can result in different trajectories of upstream sediment transport and knickpoint migration. We examine this issue of for the Marmot Dam removal in Sandy River, Oregon, USA using both physical experiments and field studies accompanying removal of the dam in October 2007. The physical experiment was designed to provide insights on how and if the position of a cofferdam notch will affect how reservoir sediments are remobilized, with the goal of minimizing the volume of sediment stranded in terraces. Data and observations indicate that at lower failure discharges, notch position impacts the location of cofferdam failure as well as the location of the first major knickpoint and its trajectory. In particular, notch positions that force the river to migrate laterally in order to adjust to natural valley orientation and morphology were most effective in removing larger volumes of sediment and reducing terrace heights. Actual cofferdam notching to maximize erosion produced extremely rapid and significant erosion of reservoir sediments. Comparison of model results with field observations suggests that the physical experiments provided solid predictions of rates of erosion and overall knickpoint trajectory.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2008
Subtitle of host publicationAhupua'a - Proceedings of the World Environmental and Water Resources Congress 2008
DOIs
StatePublished - Dec 1 2008
EventWorld Environmental and Water Resources Congress 2008: Ahupua'a - Honolulu, HI, United States
Duration: May 12 2008May 16 2008

Publication series

NameWorld Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008
Volume316

Other

OtherWorld Environmental and Water Resources Congress 2008: Ahupua'a
CountryUnited States
CityHonolulu, HI
Period5/12/085/16/08

Fingerprint

Cofferdams
cofferdam
Erosion
Sediments
Rivers
erosion
dam removal
Dams
river
sediment
trajectory
Trajectories
terrace
experiment
Sediment transport
Experiments
remobilization
sediment transport
dam
valley

Keywords

  • Cofferdams
  • Erosion
  • Oregon
  • Sediment

Cite this

Grant, G. E., Marr, J. D. G., Hill, C., Johnson, S., Campbell, K., Mohseni, O., ... Burkholder, B. K. (2008). Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon. In World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008 (World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008; Vol. 316). https://doi.org/10.1061/40976(316)350

Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon. / Grant, G. E.; Marr, J. D.G.; Hill, C.; Johnson, S.; Campbell, K.; Mohseni, O.; Wallick, J. R.; Lewis, S. L.; O'Connor, J. E.; Major, J. J.; Burkholder, B. K.

World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008. 2008. (World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008; Vol. 316).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Grant, GE, Marr, JDG, Hill, C, Johnson, S, Campbell, K, Mohseni, O, Wallick, JR, Lewis, SL, O'Connor, JE, Major, JJ & Burkholder, BK 2008, Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon. in World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008. World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008, vol. 316, World Environmental and Water Resources Congress 2008: Ahupua'a, Honolulu, HI, United States, 5/12/08. https://doi.org/10.1061/40976(316)350
Grant GE, Marr JDG, Hill C, Johnson S, Campbell K, Mohseni O et al. Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon. In World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008. 2008. (World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008). https://doi.org/10.1061/40976(316)350
Grant, G. E. ; Marr, J. D.G. ; Hill, C. ; Johnson, S. ; Campbell, K. ; Mohseni, O. ; Wallick, J. R. ; Lewis, S. L. ; O'Connor, J. E. ; Major, J. J. ; Burkholder, B. K. / Experimental and field observations of breach dynamics accompanying erosion of Marmot cofferdam, Sandy River, Oregon. World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008. 2008. (World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008).
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