Patino, Eduardo; Zucker, Mark
Zucker, Mark A.
Joe Bay 2E has 15-minute water level and discharge data by year for WY 2001-2004, hourly salinity and temperature data in one file for WY 1999-2004, and 15-minute water level, discharge, salinity, and temperature data by year for WY 2005 and 2006
Joe Bay 5C has 15-minute water level and discharge data by year for WY 2001-2003, hourly salinity and temperature data in one file for WY 1999-2004, and 15-minute water level, salinity, and temperature data by year for WY 2005 and 2006
Joe Bay 8W has 15-minute water level and discharge data by year for WY 2001-2005, hourly salinity and temperature data in one file for WY 1999-2005, and hourly salinity and temperature data for WY 2006.
Water level data is collected using an acoustic Doppler velocity meter (ADVM). An upward looking acoustic sensor provides depth data which is converted to water level using the relation of ADVM measured depth to observed water level. Site elevations in NAVD '88 were determined by the USGS Geography Discipline in 2002
Salinity and Temperature Analysis: Salinity and temperature data are currently collected using a Yellow Springs Incorp. (YSI) Optical Monitoring System (OMS) sensor. Sensors are deployed and housed in an open-ended, PVC mount to reduce bio-fouling. Hourly data is stored internally and downloaded using a YSI 650 hand-held monitoring unit. Sensors are evaluated monthly for bio-fouling and electronic drift and corrected accordingly. All YSI sensors are calibrated to laboratory determined specific conductance standards provided by the USGS Ocala Water Quality and Research Laboratory (OWQRL). Temperature sensors are verified by performing in-situ profiles and bucket comparisons against a reference sensor.
Discharge computations: Discharge in bi-directional estuarine rivers is determined by developing a velocity index rating. Velocity index ratings use the combination of in-situ velocity measurements collected every fifteen minutes by the ADVM while the cross-sectional area is determined using water level data. The cross-sectional area rating is created using an Acoustic Doppler Current Profiler (ADCP) to define the cross-sectional characteristics of the estuarine stream (width and depths) for a given water level. Changes in the cross-sectional area are directly related to changes in water level over time. The ADVM provides an average horizontal velocity measurement at a fixed depth. The ADVM is then calibrated to represent the mean channel velocity by first determining the channel discharge and dividing by the cross-sectional area. A simple linear regression between the ADVM velocity and the ADCP mean measured velocity over a range of conditions is performed to develop an equation to relate the ADVM velocity to the mean channel velocity. More detailed index velocity rating techniques are available in Hittle and others (2003). Field data is acquired during field trips and is uploaded from field computers to personal computers upon arrival to the office. All data files are quality assured prior to uploading to the USGS database.
The Joe Bay network is visited on a monthly basis and is dependent on weather conditions and access as deemed by ENP. Sites may be visited more frequently in the event of a station problem or a planned synoptic survey.
U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather
Henkel - Webmaster
Generated by mp version 2.8.18 on Wed Sep 19 18:13:46 2007