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Title:Secondary circulation in natural streams
Author(s):Demissie, M.; Soong, T.W.; Bhowmik, N.G.; Fitzpatrick, W.P.; Maxwell, W. Hall C.
Contributor(s):Illinois State Water Survey; University of Illinois at Urbana-Champaign
Subject(s):Water resources center
Water resources center--Illinois
Hydrology and hydraulics
Computer
Data acquisition
Model
Secondary circulation
Secondary current
Streams
Transverse current
Velocity
Geographic Coverage:Illinois (state)
Abstract:Secondary circulation which is sometimes referred to as secondary flow, secondary current or transverse current is an important phenomenon in natural streams and plays an important role in many natural processes in streams such as stream channel meander, bank erosion, bed scour, resuspension, and movement of sediment. Secondary circulation is that component of flow which is not in the main flow direction and is small as compared to the main flow velocity. A computerized data collection system for secondary circulation data acquisition in natural streams was developed and utilized in the field. The system includes an electromagnetic current meter, a micro-computer, an interface between the computer and the current meter, and a specially designed supporting structure. Secondary circulation data was collected in the Sangamon River near Mahomet, Illinois, utilizing the data collection system. A mathematical model for secondary circulation based on an existing model has been developed and tested against the data collected in the field. Model results generally reproduce similar secondary circulation patterns as observed from the field data but over-estimate the magnitudes of the velocities.
Issue Date:1986-07
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Type:Text
Language:English
URI:http://hdl.handle.net/2142/90125
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1986 held by the authors
Date Available in IDEALS:2016-05-18


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