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Erosion Depth of Sand from an Immobile Gravel Bed : Volume 367, Issue 367 (03/03/2015)

By Kuhnle, R.

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Book Id: WPLBN0003989018
Format Type: PDF Article :
File Size: Pages 5
Reproduction Date: 2015

Title: Erosion Depth of Sand from an Immobile Gravel Bed : Volume 367, Issue 367 (03/03/2015)  
Author: Kuhnle, R.
Volume: Vol. 367, Issue 367
Language: English
Subject: Science, Proceedings, International
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Langendoen, E., Wren, D., & Kuhnle, R. (2015). Erosion Depth of Sand from an Immobile Gravel Bed : Volume 367, Issue 367 (03/03/2015). Retrieved from http://worldlibrary.in/


Description
Description: National Sedimentation Laboratory, USDA-Agricultural Research Service, 598 McElroy Drive, Oxford, Mississippi 38655, USA. This study was conducted to improve prediction of the depth of erosion of sand (D50 = 0.3–0.9 mm) from immobile gravel (D50 = 36.1 mm) under steady uniform flows with bed shear stresses from 0.1 to 0.9 of that required to entrain the gravel. This situation, often encountered downstream of dams, has important implications for habitat restoration. Steady uniform flows were imposed on a flume channel containing a mixture of sand and gravel until sediment concentrations in the flow exiting the channel became small. The elevation of sand relative to gravel was measured after each experiment and compared poorly to calculated depths from published relationships whose predictions were based in part on the equivalent grain roughness of the bed. An improved predictive relationship was developed by using the cumulative distribution function of the surface gravel elevations to scale the shear velocity available for transporting sand from the gravel substrate.

Summary
Erosion depth of sand from an immobile gravel bed

 

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