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Low-flow traveltime, longitudinal-dispersion, and reaeration characteristics of the Souris River from Lake Darling Dam to J Clark Salyer National Wildlife Refuge, North Dakota

Water-Resources Investigations Report 87-4241

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Abstract

As part of the Sour is River water-quality assessment, traveltime, longitudinal-dispersion, and reaeration measurements were made during September 1983 on segments of the 186-mile reach of the Sour is River from Lake Darling Dam to the J. Clark Salyer National Wildlife Refuge. The primary objective was to determine traveltime, longitudinal-dispersion, and reaeration coefficients during low flow. Streamflow in the reach ranged from 10.5 to 47.0 cubic feet per second during the measurement period.

On the basis of channel and hydraulic characteristics, the 186-mile reach was subdivided into five subreaches that ranged from 18 to 55 river miles in length. Within each subreach, representative test reaches that ranged from 5.0 to 9.1 river miles in length were selected for tracer injection and sample collection. Standard fluorometric techniques were used to measure traveltime and longitudinal dispersion, and a modified tracer technique that used ethylene and propane gas was used to measure reaeration. Mean test-reach velocities ranged from 0.05 to 0.30 foot per second, longitudinal-dispersion coefficients ranged from 4.2 to 61 square feet per second, and reaeration coefficients based on propane ranged from 0.39 to 1.66 per day.

Predictive reaeration coefficients obtained from 18 equations (8 semiempirical and 10 empirical) were compared with each measured reaeration coefficient by use of an error-of-estimate analysis. The predictive reaeration coefficients ranged from 0.0008 to 3.4 per day. A semiempirical equation that produced coefficients most similar to the measured coefficients had the smallest absolute error of estimate (0.35). The smallest absolute error of estimate for the empirical equations was 0.41.

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Low-flow traveltime, longitudinal-dispersion, and reaeration characteristics of the Souris River from Lake Darling Dam to J Clark Salyer National Wildlife Refuge, North Dakota
Series title:
Water-Resources Investigations Report
Series number:
87-4241
Year Published:
1987
Language:
English
Publisher:
U.S. Geological Survey
Contributing office(s):
North Dakota Water Science Center, Dakota Water Science Center
Description:
ix, 66 p.