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United States Department of Agriculture

Agricultural Research Service

Title: Discussion of Downstream Fining by Selective Deposition: Theory, Laboratoryand Field Observations

Author
item Kuhnle, Roger

Submitted to: Gravel-Bed Rivers in the Environment
Publication Type: Proceedings
Publication Acceptance Date: April 1, 1997
Publication Date: N/A

Interpretive Summary: A thorough knowledge of the movement of sand and gravel through the streams of a watershed is important for a variety of reasons. Movement and storage of the sand and gravel may fill reservoirs and reduce their capacity, may fill channels and cause flooding, may degrade water quality, and may cause instability of the channel banks which can cause the destruction of valuable land. In this paper the question is raised whether a recently proposed model can predict the change in sizes of sand and gravel that comprise the bottom of the streams in Goodwin Creek. This predictive capability is an integral part of being able to effectively manage the movement of sediment in mixed land-use watersheds.

Technical Abstract: The median size of the bed material on the Goodwin Creek Experimental Watershed varies from 0.5 mm in the upper reaches of the watershed, increases to a peak value of 7 mm in the central part of the watershed, and decreases to 1 mm towards the outlet. Recently Seal et al. have proposed a model to explain the downstream fining of bed material in gravel-bed streams. The model of Seal et al. was proposed only for aggrading systems. The question is raised here as to whether this model could be successfully used to predict the bed material size distribution on Goodwin Creek.

Last Modified: 9/23/2014
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