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Variation of alluvial-channel width with discharge and character of sediment

Water-Resources Investigations Report 79-15

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Abstract

Use of channel measurements to estimate discharge characteristics of ungaged streams has shown that little agreement exists for the slope of the width-discharge regression relation. Three groups of perennial stream channels with differing characteristics were selected for study using consistent procedures of width measurement. A common feature of the groups was general channel stability, that is, absence of excessive widening by recent extremely high discharges. The groups were: (1) 32 channels of gradient exceeding 0.0080, low suspended-sediment discharge, high channel roughness, and low discharge variability; (2) 13 streams of similar climatic conditions and having at least 70 percent silt and clay in the bed material; and (3) 18 spring-discharge channels with steady discharge and similar climate. Values for the exponent for the three groups are 1.98, 1.97, and 1.97, respectively; coefficient values are 0.017, 0.042, and 0.011 (when using metric units). Assuming a constant exponent of 2.0, equations were developed expressing the manner in which channel sediment affects the width-discharge relation. (Woodard-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Variation of alluvial-channel width with discharge and character of sediment
Series title:
Water-Resources Investigations Report
Series number:
79-15
Edition:
-
Year Published:
1979
Language:
ENGLISH
Publisher:
U.S. Geological Survey, Water Resources Division,
Description:
iv, 11 p. :ill. ;26 cm.