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Seasonality of Selected Surface Water Constituents in the Indian River Lagoon, Florida

^a Univ. of Florida, Tropical Research & Education Center, Soil and Water Science Dep. and Biological and Agricultural Engineering Dep., IFAS, Univ. of Florida, 18905 SW 280th St., Homestead, FL 33031
^b South Florida Water Management District, 3301 Gun Club Rd., West Palm Beach, FL 33406
^c Univ. of Miami, Dep. of Civil, Architectural, and Environmental Engineering, Coral Gables, FL 33124

View larger version (35K): [in this window] [in a new window]   Fig. 1. Location of the South Indian River Lagoon/St. Lucie Estuary (IRL/SLE) watershed and primary canals, the South Florida Water Management District (SFWMD) structures in this area.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Flow chart for evaluating seasonal influences in time series water quality data (LOESS refers to locally weighted scatter plot smoother, and ESTREND to Estimation TREND).

View larger version (15K): [in this window] [in a new window]   Fig. 3. Total phosphorus concentration representing wet season from 1979 through 2004 at Station C25S50 and flow (in log scale) plot with the LOESS (locally weighted scatter plot smoother) smooth line, x and y axis are in log scales.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Locally weighted scatter plot smoother (LOESS) residuals for total phosphorus and flow (in log scale) plot, including a dotted line at the zero value of the residuals and a LOESS smooth line through the data.

View larger version (13K): [in this window] [in a new window]   Fig. 5. Locally weighted scatter plot smoother (LOESS) residuals for total phosphorus against the quantiles of the standard normal distribution. Residuals should follow a straight line if they were normally distributed.

View larger version (16K): [in this window] [in a new window]   Fig. 6. Time series of mean monthly precipitation at Canals C-24, C-25, and C-44.

View larger version (18K): [in this window] [in a new window]   Fig. 7. Time series of mean 5-d precipitation averaging on three stations. Rainy season was defined based on this figure from 27 May to 7 November.

View larger version (25K): [in this window] [in a new window]   Fig. 8. Seasonal patterns of major water quality indicators at Stations (a) C24S49, (b) C25S50, and (c) C44S80. The y axis represents log-transformed flow-adjusted concentration (FAC) of constituents (specific conductivity in dS m–1, turbidity in NTU, color in PCU, and chloride in mg L–1).

View larger version (25K): [in this window] [in a new window]   Fig. 9. Seasonal patterns of nutrient species at Stations (a) C24S49, (b) C25S50, and (c) C44S80. The y axis represents log-transformed flow-adjusted concentration (FAC) of constituent (mg L–1).