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Near-Surface Water-Quality Surveys of the Caloosahatchee River and Downstream Estuaries, Florida, USA


Methodology

Moving-boat surveys are used to produce water-quality maps at least four times per year. The boat surveys typically began at the boat ramp near Punta Rassa, enter San Carlos Bay, extend around Pine Island, continue upstream along the Caloosahatchee River, and end at the W. P. Franklin Lock and Dam (S-79). Sensor and coordinate data are recorded as the boat travels throughout the study area making measurements using a flow-through onboard pump system. Salinity, temperature, dissolved oxygen, pH, and turbidity data are recorded at 5-second intervals. Sensors are calibrated prior to each survey following procedures described in Wagner and others (2006). Data is processed and reviewed using procedures outlined in Soderqvist and Patino (2010). Water quality maps are created using the ESRI Arc Map GIS program. Maps and data in table format can be retrieved by date of survey and parameter.

Fluorescence of chromophoric dissolved organic matter (FDOM) data are recorded at 15-second intervals. FDOM is recorded as relative fluorescence units, corrected for temperature and turbidity with equations from Downing and others (2012), and converted to parts per billion (ppb) quinine sulfate equivalents units (QSE). After conversion, a correction is applied to account for inner filter effects using absorbance at 254 nanometers (A254) (Downing and others, 2012). Additional information on the processing of FDOM data can be found in Booth and others (2016).


References cited:

Booth, A. C., Soderqvist, L. E., and Knight, T.M. 2016, Effects of variations in flow characteristics through W.P. Franklin Lock and Dam on downstream water quality in the Caloosahatchee River Estuary and in McIntyre Creek in the J.N. "Ding" Darling National Wildlife Refuge, southern Florida, 2010-13: U.S. Geological Survey Scientific Investigations Report 2016-5033.

Downing, B.D., Pellerin, B.A., Bergamaschi, B.A., Saraceno, J.F., and Kraus, T.E.C., 2012, Seeing the light - The effects of particles, dissolved materials, and temperature on in situ measurements of DOM fluorescence in rivers and streams: Limnology and Oceanography: Methods, v. 10, no. 10, p. 767-775. http://dx.doi.org/10.4319/lom.2012.10.767.

Soderqvist, L.E., and Patino, Eduardo, 2010, Seasonal and spatial distribution of freshwater flow and salinity in the Ten Thousand Islands Estuary, Florida, 2007-2009: U.S. Geological Survey Data Series 501, 24 p. http://pubs.usgs.gov/ds/501/.

Wagner, R.J., Boulger, Jr., R.W., Oblinger, C.J., and Smith, B.A. 2006, Guidelines and standard procedures for continuous water-quality monitors: Station operation, record computation, and data reporting: U.S. Geological Survey Techniques and Methods 1-D3, 51 p. http://pubs.usgs.gov/tm/2006/tm1D3/.



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