WIND EFFECTS ON CHEMICAL SPILL IN ST ANDREW BAY SYSTEM
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1 WIND EFFECTS ON CHEMICAL SPILL IN ST ANDREW BAY SYSTEM PETER C. CHU, PATRICE PAULY Naval Postgraduate School, Monterey, CA93943 STEVEN D. HAEGER Naval Oceanographic Office, Stennis Space Center MATHEW WARD Applied Science Associates, Inc.Narragansett, RI
2 Outlines Geographic Environment Hydrodynamic model Forcing mechanisms Hydrochemical model Conclusions
3 Geographic location - overview Northeastern Gulf of Mexico Part of the Intracoastal highway Fed by Deer Point Lake dam Deer Point Lake dam
4 Geographic location - bathymetry Panama City Beach Panama City West boundary East boundary West Pass East Pass
5 Geographic location - bathymetry Panama City Beach Panama City Beach City West boundary East boundary West Pass East Pass
6 Geographic location - bathymetry West boundary Panama City Beach Panama City East boundary West boundary East boundary West Pass East Pass
7 Geographic location - bathymetry Panama City Beach Panama City West Pass West boundary East boundary West Pass East Pass East Pass
8 Seasonal variability of tidal constituents at Panama City Beach.
9 Tides from NOAA NOAA website provides: Tidal gauge time series Tidal constituents Panama City Beach station: amplitude in cm phase in deg. K1: (0.3) (1) O1: (0.3) (1) Q1: 3.4 (0.3) (5.5) M2: 3.4 (0.1) (1.5) S2: 2 (0.1) (2.5)
10 Watershed (Fresh-water influx)
11 Bay county sub-basins flow number flow [m 3 /s]
12 Low Monthly mean winds Jan. Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec dir. N N SSE S S WSW WSW E ENE N N N speed Wind values (m/s) averaged over the past 60 years average: 0.12m/s northwesterlies May through September average: 4m/s.
13 High Synoptic Winds Can easily reach 20 m/s and more during hurricane events
14 Water Quality Management and Analysis Package (WQMAP) WQMAP is an integrated modeling system designed to study surface water quality issues. The system allows the engineer or scientist to develop numerical grids, perform hydrodynamic simulations, conduct single constituent pollutant transport and multiple constituent eutrophication studies in a geographic context all from one application.
15 Features of WQMAP Integrated Geographic Information System Grid Generation Hydrodynamic Model Pollutant Transport Model Eutrophication Model All models use same computational grid Applicable within regions such as rivers, lakes, estuaries, bays and coastal seas.
16 Hydrodynamic Model
17 Hydrodynamic model grid generation
18 Wind impacts 25m/s 20m/s 09/16 at 05:00 AM 09/16 at 01:20 PM
19 Errors overview cor ecv rmse rme West Bay cor ecv rmse rme East Bay cor ecv rmse rme West Pass bottom surface bottom surface bottom surface salinity v u Runoff fluctuation
20 Chemical Spill (Ethylene Glycol ) 10 tons of the aforementioned chemical constituent is released at depth of 0.5 m. The release locations are selected in order to identify the tidal pumping effect and the vertical mixing process.
21 Chemical Discharge Model System (CHEMMAP) CHEMMAP is a chemical discharge model designed to predict the trajectory, fate, impacts and biological effects of a wide variety of chemical substances threedimensionally.
22 Features of CHEMMAP Contains ASA's own GIS or can be used in other GIS software such as ArcView. Location specific environmental/ biological data applied to any fresh or salt aquatic environment in the world. Can utilize a variety of hydrodynamic file formats. Easily interpreted visual displays of concentrations over time. 3D Viewer capabilities. Biological exposure model to predict exposed fish and wildlife impacts. MSDS database linked to the physical-chemical database. Extensive chemical database providing physical-chemical data.
23 Chemical Fates Model Initial plume dynamics. Slick spreading, transport, and entrainment of floating materials. Evaporation and volatilization (to atmosphere). Transport and dispersion of dissolved and particulate materials in the water column and in the atmosphere. Dissolution and adsorption to suspended sediments. Sedimentation and resuspension. Natural degradation. Shoreline entrainment. Boom effectiveness.
24 Control Case (Chemical Release on June ) Mass Balance for ethylene glycol Surface Water Column Ashore Evaporated 100 Decay Sediment Cleaned % Time (days) Spill dispersion after 3 weeks
25 Wind Vectors
26 Wind effects on spill propagation No wind simulation Reversed wind simulation
27 Release time influence stochastic model 50 cases from 1 st of June to 31 st of August Run number for worst case scenario
28 Release the 1 st of June 12:00am Concentration (mg/m3) (mg/m3) Maximum Dissolved Concentrations Maximum Concentration at any Location (Horizontally and Vertically) for Dissolved W, W, W, W, W, W, N N N N N N for ethylene glycol Time Time (days) (days)
29 Release location influence
30 Time response delay Minimum time to exceed a threshold
31 Conclusions Importance of the wind in the pollution drift,. particularly in St Andrew Bay system. East-west bay bias of the chemical spill pattern is not crucial because it is largely affected by the winds. The tides impact on the estuarine circulation with imbalanced ebb and flood periods.
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