A critical component of the Lake Michigan Diversion Accounting (LMDA) program, which oversees the diversion of Great Lakes water by the State of Illinois, is the U.S. Geological Survey (USGS) streamflow gaging station on the Chicago Sanitary and Ship Canal (CSSC) near Lemont, Illinois (05536890). The long-term application of an up-looking acoustic Doppler current profiler (ADCP) at this gaging station allows the flows at this site to be examined from a new perspective; one that is not possible with the horizontally-oriented instruments typically used at the site. This data release includes continuous 1-minute and 15-minute time-averaged velocity data from an up-looking ADCP deployed on the bed of the CSSC approximately 170 feet upstream of the streamgage (Latitude: 41.691151 degrees North, Longitude: -87.963081 degrees West; World Geodetic System 1984). The 1,200 kHz Teledyne RDI Rio Grande ADCP was mounted in a custom-built aluminum mount and fixed (bolted) to the bedrock bottom of the canal by divers on June 18, 2013. A direct connection between the gage house and the instrument was possible using a 300 foot (ft) armored power and communication cable. The trawl-resistant mount was designed to shed debris and places the ADCP transducers 2.0 ft above the bed of the canal. The bed elevation at the deployment location at the time of deployment was measured to be 550.61 ft above the North American Vertical Datum of 1988 (NAVD88). The ADCP was configured with thirty 0.98 ft bins and a 0.82 ft blanking distance. The center of the first bin was located 4.3 ft above the channel bed. The instrument was configured to use water mode 12 with 100 subpings per 1-minute ensemble and a time between subpings of 0.55 seconds. Therefore, each 1-minute ensemble represents an average over approximately 57 seconds of each minute. This configuration produces 1-minute time-averaged velocity profiles with an estimated standard deviation of horizontal velocity of approximately 0.04 feet per second. The 1-minute time-averaged data are used by the Campbell Scientific CR1000 data logger to compute the 15-minute time-averaged data. Time stamps (in Central Standard Time) are recorded at the end of the 1-minute and 15-minute averaging intervals. Data from the instrument including streamwise, transverse, and vertical velocity components, return signal strength indicator (RSSI), correlation, pitch, roll, water temperature at the transducer head, and battery voltage are included in the datasets.
|Title||Up-looking acoustic Doppler current profiler data in the Chicago Sanitary and Ship Canal near Lemont, Illinois, January 2014 to January 2018|
|Authors||Patrick (Ryan) R Jackson, Kevin K. Johnson|
|Product Type||Data Release|
|Record Source||USGS Digital Object Identifier Catalog|
|USGS Organization||Central Midwest Water Science Center|