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Title:Hydraulic geometry and low streamflow regimen
Author(s):Stall, John B.; Yang, Chih Ted
Contributor(s):Illinois State Water Survey
Subject(s):Water resources center
Water resources center--Illinois
Hydrology and hydraulics
Hydraulic geometry
Stream systems
Unit stream power
Geographic Coverage:Illinois (state)
Abstract:Unit stream power defined as the time rate of potential energy expenditure per unit weight of water of a natural stream has been studied intensively in this report. It is shown that the distribution and variation of unit stream power have a determinate effect on the behavior of a natural stream. The unit stream power can be regulated by a stream through the combined process of meandering, forming pools and riffles, and carving a concave longitudinal stream bed profile. A study of the Kaskaskia River basin shows that sinuosity increases in the downstream direction by meandering. Field measurements made along the Middle Fork Vermilion River indicate that unit stream power can be minimized by the formation of pools and riffles. The hydraulic geometry--unit stream power equations developed for 9 river basins in the United States show that un-it stream power in a river basin decreases with increasing frequency of flow and drainage area. These results are evidence of different levels of self adjustment made by a natural stream to minimize its unit stream power in accordance with the law of least time rate of energy expenditure. The calculated dimensionless dispersion coefficients--at 11 gaging stations in the Kaskaskia River Basin show that the coefficients increase with increasing width-depth ratio.
Issue Date:1972-07
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1972 held by John B. Stall, Chih Ted Yang
Date Available in IDEALS:2016-05-23

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