Keywords
submarine outfalls
pollution plume
advection–diffusion
coastal marine ecosystems
Python
How to Cite
Abstract
This article analyzes the environmental impact of submarine wastewater outfalls on coastal marine ecosystems through a computational simulation approach implemented in Python. A stationary analytical model of advection–diffusion–reaction is used to represent contaminant dispersion in the far-field region of the discharge plume. Two scenarios are compared: a base scenario representing current conditions, and a mitigation scenario involving reduced contaminant load, increased depth, and improved initial dilution. The results show significant differences in concentration levels, area exceeding an environmental threshold, and compliance distance. These findings support the use of simple and accessible numerical models as a decision-support tool for outfall design, environmental assessment, and coastal management in vulnerable areas.
References
C. Tuholske, L. Halpern, J. Blasco, B. Bartzanas, and A. C. Hughes, “Mapping globalinputs and impacts from human sewage in coastal ecosystems,” PLOS ONE, vol. 16, no. 5,p. e0251028, 2021. [Online]. Available: https://doi.org/10.1371/journal.pone.0251028
R. Bhikhoo, R. M. Jeffs, B. van Oudenhoven, and C. M. Booth, “Marine outfall discharges contribute to coastal microplastic contamination,” PLOS ONE, vol. 15, no. 8, p. e0237703, 2020. [Online]. Available: https://doi.org/10.1371/journal.pone.0237703.
M. Ho, T. Kimura, and Y. Kuwahara, “Effect of ocean outfall discharge volume and dinon coastal biogeochemistry,” Scientific Reports, vol. 11, p. 21084, 2021. [Online]. Available: https://doi.org/10.1038/s41598-021-00493-3.
M. Lecart, S. L. H. Pham, and C. M. Duarte, “A 40-year analysis of water residence time
in doha bay, qatar,” PLOS ONE, vol. 16, no. 9, p. e0257139, 2021. [Online]. Available: https://doi.org/10.1371/journal.pone.0257139.
A. Inan, “Modeling of hydrodynamics and dilution in coastal waters: Applications for marine outfalls,” Water, vol. 12, no. 9, p. 2438, 2020. [Online]. Available: https://doi.org/10.3390/w12092438.
A. Castro-Olivares, P. P´erez, and A. C. Torres, “Coupled hydrodynamic and biogeochemical modeling of nutrient dispersion from a submarine outfall,” Journal of Marine Science and Engineering, vol. 9, no. 5, p. 490, 2021. [Online]. Available: https://doi.org/10.3390/jmse9050490.
B. Faria, P. Santos, and R. Calado, “Insights for sea outfall turbid plume monitoring through sentinel-2 high-resolution imagery,” Remote Sensing, vol. 13, no. 22, p. 4482, 2021. [Online]. Available: https://doi.org/10.3390/rs13224482.
E. Hadjisolomou, C. Papadimitriou, and I. Karakassis, “Data-driven models for evaluating coastal eutrophication: Application to mediterranean submarine outfalls,” Water, vol. 13, no. 6, p. 813, 2021. [Online]. Available: https://doi.org/10.3390/w13060813.
J. Smith, R. F. Johnson, and K. M. Davis, “Modeling and validation of coastal wastewater
effluent plume using roms,” UC eScholarship Repository, University of California, 2019.
[Online]. Available: https://escholarship.org/uc/item/xyz123.
R. W. Smith, “Modeling submarine outfalls and ocean discharges,” Journal of Hydraulic Engineering, vol. 122, no. 6, pp. 293–301, 1996. [Online]. Available: https://doi.org/10.1061/(ASCE)0733-9429(1996)122:6(293).
D. Roberts, “Mixing in inland and coastal waters,” U.S. Environmental Protection Agency,
Tech. Rep. EPA/600/R-10/098, 2010. [Online]. Available: https://nepis.epa.gov/Exe/
ZyPDF.cgi/P100H3Z7.PDF.
D. R. F. Harleman, “Delft3d: A 3d flow model for shallow water,” Deltares Technical Reports, Tech. Rep., 2011. [Online]. Available: https://www.deltares.nl/en/software/delft3d-4-suite/
A. Shchepetkin and J. C. McWilliams, “The regional oceanic modeling system (roms): A split-explicit, free-surface, topography-following-coordinate oceanic model,”
Ocean Modelling, vol. 9, no. 4, pp. 347–404, 2005. [Online]. Available: https://doi.org/10.1016/j.ocemod.2004.08.002.
D. Group, “Mike 21 flow model fm: Hydrodynamic module scientific documentation,”Danish Hydraulic Institute, Tech. Rep., 2017. [Online]. Available: https://www.mikepoweredbydhi.com/products/mike-21
D. Jirka, “Cormix: A hydrodynamic mixing zone model and decision support system for surface waters,” U.S. EPA, Tech. Rep. EPA/600/R-01/103, 2001. [Online]. Available:https://www.epa.gov/water-research/cormix
U.S. Environmental Protection Agency (EPA), “Visual plumes modeling system,”
Office of Science and Technology, Tech. Rep., 2012. [Online]. Available: https://www.epa.gov/ceam/visual-plumes
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