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Discharge of sediment in channelized alluvial streams

Water Resources Bulletin

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DOI: 10.1111/j.1752-1688.1989.tb01330.x

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Abstract

Approximately 400 million cubic feet of channel sediments have been delivered to the Mississippi River from the Obion-Forked Deer River system in the last 20 years. The discharge of sediment from these channelized networks in West Tennessee varies systematically with the stage of channel evolution. Maximum bed-material discharges occur during the initial phases of degradation (Stage III). In contrast, yields of suspended-sediment peak during the threshold stage (Stage IV: large-scale mass wasting) as sediments are delivered from main-channel banks and tributary beds. Suspended-sediment yields then decrease as aggradation (Stage V) becomes the dominant trend in the main channels, but remains relatively high through restabilization (Stage VI) because of continued degradation and widening in the tributaries. Bed-material discharges decrease from the degradation stage (III) to Stage V, and increase again during restabilization (Stage VI) because secondary aggradation increases gradients and incipient meandering serves to rework bed sediments. Additional aspects of the subject are discussed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Discharge of sediment in channelized alluvial streams
Series title:
Water Resources Bulletin
DOI:
10.1111/j.1752-1688.1989.tb01330.x
Volume
25
Issue:
6
Year Published:
1989
Language:
English
Publisher:
American Water Resources Association
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Bulletin
First page:
1177
Last page:
1188
Number of Pages:
12