8252

• UCREFRP Catalog Number: 8252
• Author: Allred, T. M. and J. C. Schmidt.
• Title: Channel Narrowing of the Green River Near Green River, Utah
• USFW Year: 1999.
• USFW - Doc Type: History, Rates, and Processes of Narrowing.
• Copyright Material: NO

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roughly 50 percent betWeen 1938 and 1993 (Fig. 10b). Loss of isla rid

complexes and the accompanying secondary channels represent an overall

simplification of the channel form and could have implications for the availability

of aquatic habitat.

The GIS analysis also indicated that both erosion and deposition

occurred even during periods of relative stability. The maps also showed some

overall patterns in the style of erosion and deposition that occurred during the

period of photographic record. The following patterns generally were identified

for all time periods: (1) margins of persistent islands tended to be quite dynamic

with erosion on the main-channel side and deposition on the near-shore side,

(2) river meanders in the wide portion of the valley were active, experiencing

. slight erosion on the outside of the bends and considerable deposition on the

point bars, and (3) straight reaches generally were less active but did show the

formation of inset lateral dep'osits or benches.

Stratigraphy and Dendrochronology
The accreted deposit on the right bank at the present cableway was
excavated and its stratigraphy analyzed (Fig. 14). Several of the saltcedar
emerging at ground level have multiple buried root crowns located primarily on
and below two organic layers located approximately 1 m below the present
surface. The organic layers are distinct and well-developed, and have high
levels of organic carbon (Boettinger, pers. comm.), which indicates that each