Wind and tide effects on the Choctawhatchee Bay plume and implications for surface transport at Destin Inlet
KAUST Grant NumberOSR-CRG2018-3711
Embargo End Date2021-02-28
Permanent link to this recordhttp://hdl.handle.net/10754/667343
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AbstractMultiple river-dominated estuaries line the northern Gulf coast and introduce substantial density variations. Their plumes have been shown to be highly sensitive to wind and tide effects, but in studies with limited observations and idealized wind forcing. This study explores these effects with a dynamic model that can represent the full behavior from river through estuary to shelf, and for a period with extensive observations. The inner shelf adjacent to Choctawhatchee Bay, a micro tidal estuary situated along the Florida Panhandle, is subject to buoyant, brackish outflows during the ebb-phase of the tidal cycle. In December 2013, experiments were performed in this region to study mechanisms that influence near-shore surface transport. Satellite imagery showed a visible brackish surface plume at Destin during low tide. The goal of the present study is to quantify variability in the plume signature due to changes in tidal and wind forcing. Density-driven flows near Destin Inlet are modeled with the recently-enhanced, three-dimensional, baroclinic capabilities of the ADvanced CIRCulation (ADCIRC) model. Modeled tides, salinities and plume signature are validated against in-situ observations and satellite imagery. Model results reveal substantial changes in the length, width and orientation of the plume as the wind direction varied on consecutive days due to winter cold fronts. During a period of near-constant winds and variability in tidal amplitude, the model predicted a larger plume during spring tides than during neap conditions. Coriolis effects on the plume are minimized due to its small scale nature. Therefore, when the wind forcing is weak, the plume signature spreads radially from the inlet with slight preference to the down-shelf. The Choctawhatchee Bay plume is representative of other small-scale plumes formed in river-dominated and micro-tidal environments, and this work demonstrates the sensitivity of these plumes to changing environmental conditions.
CitationCyriac, R., Dietrich, J. C., Blain, C. A., Dawson, C. N., Dresback, K. M., Fathi, A., … Kolar, R. L. (2020). Wind and tide effects on the Choctawhatchee Bay plume and implications for surface transport at Destin Inlet. Regional Studies in Marine Science, 35, 101131. doi:10.1016/j.rsma.2020.101131
SponsorsThis work was made possible by grants from the Gulf of Mexico Research Initiative through the Consortium for Advanced Research on Transport of Hydrocarbon in the Environment. Data are publicly available through the Gulf of Mexico Research Initiative Information & Data Cooperative (GRIIDC) at (Cyriac and Dietrich, 2020). We thank the Choctawhatchee Basin Alliance for providing us with observed monthly salinity data in Choctawhatchee Bay. This work used the Extreme Science and Engineering Discovery Environment (Towns et al. 2014), which is supported by National Science Foundation grant number ACI-1548562, specifically the Stampede2 supercomputer at the Texas Advanced Computing Center via the allocation TG-DMS080016N. Co-author Dawson acknowledges the support of the King Abdullah University of Science and Technology, Saudi Arabia Office of Sponsored Research under award number OSR-CRG2018-3711.