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ADCP measurements of gravity currents in the Chicago River, Illinois

Journal of Hydraulic Engineering

By:
, ,
DOI: 10.1061/(ASCE)0733-9429(2007)133:12(1356)

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Abstract

A unique set of observations of stratified flow phenomena in the Chicago River was made using an upward-looking acoustic Doppler current profiler (ADCP) during the period November 20, 2003 to February 1, 2004. Water density differences between the Chicago River and its North Branch (NB) seem to be responsible for the development of gravity currents. With the objective of characterizing the occurrence, frequency, and evolution of such currents, the ADCP was configured to continuously collect high-resolution water velocity and echo intensity profiles in the Chicago River at Columbus Drive. During the observation period, 28 gravity current events were identified, lasting a total of 77% of the time. Sixteen of these events were generated by underflows from the NB and 12 of these events were generated by overflows from the NB. On average, the duration of the underflow and overflow events was 52.3 and 42.1 h, respectively. A detailed analysis of one underflow event, which started on January 7, 2004, and lasted about 65h, was performed. This is the first time that ADCP technology has been used to continuously monitor gravity currents in a river. ?? 2007 ASCE.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
ADCP measurements of gravity currents in the Chicago River, Illinois
Series title:
Journal of Hydraulic Engineering
DOI:
10.1061/(ASCE)0733-9429(2007)133:12(1356)
Volume
133
Issue:
12
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Hydraulic Engineering
First page:
1356
Last page:
1366
Number of Pages:
11