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Determining the Critical Discharge for Sediment Transport in Beds of Different Grain Sizes

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Title: Determining the Critical Discharge for Sediment Transport in Beds of Different Grain Sizes
Creator: Ramsey Coronado, Peter Wilcock, Chuck Podolak, Jeff Marr, Karen Campbell, Diana Dalbotten
Date Created and/or Issued: 2008
Contributing Institution: UC Riverside, Library, Water Resources Collections and Archives
Collection: Clearinghouse for Dam Removal Information (CDRI)
Rights Information: Copyrighted
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Description: Scope/Content: Abstract: The Marmot Dam in Sandy, Oregon, located on the Sandy River, is a dam that is being removed, and was the setting for a quantitative and qualitative analysis of the preconditions of a river system prior to dam removal. The area of focus was determining the critical shear stress required to cause sediment along a riverbed and the surface of a river bar with materials of different grain sizes to move. The method for evaluating the different grain sizes was with the use of the pebble count technique as described by Wolman. Then with the software WinXSPRO and several sediment transport equations, the critical discharge was determined. The results obtained were different critical flow rates at different cross-sections that will cause the sediment to move. Identifying these values will help to better determine how an increased flow after the dam removal will affect the sediment transfer rates and deposition.
Scope/Content: Height: 30 feet. Length: 4690 feet.
Scope/Content: Date constructed: 1913. Date removed: 2007.
Type: text
Identifier: ark:/86086/n2348k0b
1219
Language: English
eng
Subject: Pre- and post-project monitoring
Sediment and channel dynamics
Dams
Dam retirement
Place: Sandy River, OR
Marmot Dam

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