A hydrodynamic model is applied to a domain encompassing Mosquito Lagoon and a segment of north Indian River Lagoon on the east coast of Florida with the goals of (1) describing the hydrodynamic regime of the area according to existing conditions and (2) to determine the flushing rates of the system after introducing a hypothetical pollutant (numerical dye tracer). Results from the 1-year simulation agree with observations and show that the Mosquito Lagoon (ML) and North Indian River Lagoon (NIRL) are dominated by the nontidal (low frequency) water level oscillations except at the northernmost part of the ML where the influence of tidal renewal dominates. The global tracer application results reveal that only the two northernmost segments of Mosquito Lagoon (ML-ac and ML-df) reach 50% of tracer concentrations (R50) within the year of simulation (day 19 and day 176 respectively). The five (discrete) segments tracer study resulted in lower R50 values and the hypothetical pollutant is removed (flushed) from each of the segments within the year and with an averaged renewal time value for the Mosquito Lagoon basin of 98 days. Observed throughout the simulation period is the interaction across the different segments and a predominantly two-layered water mass exchange through the Haulover Canal. Most significant is that the resulting renewal times (R50) indicate the existence of three dynamically distinct sections within Mosquito Lagoon. These findings aid in the identification of poorly flushed zones and serve as a baseline for the duration and possible propagation of detrimental conditions such as a harmful algal bloom (HAB) event or a contaminant spill.
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The data sets used and analyzed during this study are available from the corresponding author on reasonable request.
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We would want to extend our gratitude to Dr. John Trefry, Dr. Steven Lazarus, and Mr. Michael Splitt for their availability to discuss data, methods, and relevant scientific literature.
Jo-Ann Rosario-Llantín: conceptualization, investigation, methodology, formal analysis, and writing-original draft preparation. Gary A. Zarillo: funding acquisition, initial data acquisition, methodology review, writing-review, and editing.
This study was possible due to the interest and support from the National Park Service and Scientific and Environmental Applications, Inc. (Contract Number N5180070017, from 2006 to 2009).
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Map progression of Salinity Field (Top and Bottom Layers). (AVI 79561 kb)
Map progression of Water Temperature Field (Top and Bottom Layers). (AVI 91224 kb)
Close-up map progression of Salinity Field around Haulover Canal (Top and Bottom Layers) (AVI 500033 kb)
Global Tracer (Baseline Case study). Map progression of Tracer Field (Top and Bottom Layers) (AVI 62123 kb)
Segment C (third segment of ML basin). Map progression of Tracer Field (Top and Bottom Layers) (AVI 62411 kb)
Map Segment D (fourth segment of ML basin). Map progression of Tracer Field (Top and Bottom Layers) (AVI 61313 kb)
Segment E (NIRL basin). Map progression of Tracer Field (Top and Bottom Layers) (AVI 59239 kb)
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Rosario-Llantín, JA., Zarillo, G.A. Flushing rates and hydrodynamical characteristics of Mosquito Lagoon (Florida, USA). Environ Sci Pollut Res (2021). https://doi.org/10.1007/s11356-021-12367-1
- Indian River Lagoon
- Renewal times
- Water quality
- Hydrodynamical modeling
- Numerical tracer study
- Environmental Fluid Dynamics Code