Characterizing a December 2005 Density Current Event in the Chicago River, Chicago, Illinois

García, Carlos M.; Jackson, P. Ryan; Oberg, Kevin A.; Johnson, Kevin K.; García, Marcelo H.

doi:doi:10.1061/40856(200)155

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Proceedings / Volume 200 / Issue 40856 / ACOUSTIC DOPPLER PROFILING APPLICATIONS

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Characterizing a December 2005 Density Current Event in the Chicago River, Chicago, Illinois

ASCE Conf. Proc. doi:10.1061/40856(200)155

Examining the Confluence of Environmental and Water Concerns

Proceedings of the World Environmental and Water Resources Congress 2006

Carlos M. García¹, P. Ryan Jackson¹, Kevin A. Oberg², Kevin K. Johnson³, and Marcelo H. García¹

¹Ven Te Chow Hydrosystems Laboratory, Dept. of Civil and Environmental Engineering, University of Illinois at Urbana‐Champaign, 205 North Mathews Ave., Urbana, IL 61801
²U.S. Geological Survey, Office of Surface Water, 1201 W. University Ave., Urbana, IL 61801
³U.S. Geological Survey, Illinois Water Science Center, 1201 W. University Ave., Urbana, IL 61801

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Abstract

During the winter months, the Chicago River in Chicago, Illinois is subject to bi‐directional flows, and density currents are thought to be responsible for these flow variations. This paper presents detailed field measurements using three acoustic Doppler current profiler instruments and simultaneous water‐quality measurements made during December 2005. Observations indicate that the formation of density currents within the Chicago River and density differences are mostly due to salinity differences between the North Branch and the main stem of the Chicago River, whereas temperature difference does not appreciably affect the creation of density currents. Sources of higher water temperature, conductivity, and salinity values should be addressed in future studies.