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Behavior of effluents discharged into shallow coastal waters under the influence of spring-neap tidal currents

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Abstract

The oscillatory nature of the coastal longshore currents is one of the major factors that play a significant role in the spreading of discharged effluents in marine environments. Most previous investigations of the dispersion of discharged effluents through an outfall into the sea have been based on a simple sinusoidal tidal. In reality, tidal currents are more complicated and often contain oscillations of two different frequencies. An analytical solution of a two-dimensional advection-diffusion equation containing a developed spring-neap tidal current has been applied in the present paper. A parametric examination has been performed to study the effects of the spring-neap tidal currents on the concentration at the shoreline and along the centerline of discharge effluent plume from a single outfall. A comparison study of a constant discharge and a time-varying discharge strategy which depends on the spring-neap tidal current is also conducted. Finally, the interaction and merging of effluent discharge plumes from a system of two outfalls, including a single outfall installed with two-port diffuser, are investigated.

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  1. Department of Mathematics, College of Science, Sultan Qaboos University, Al-Khod PC123, P.O. Box 36, Muscat, Sultanate of Oman

    Ahmed Al-Kasbi & Anton Purnama

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  1. Ahmed Al-Kasbi
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  2. Anton Purnama
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Correspondence to Ahmed Al-Kasbi.

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Al-Kasbi, A., Purnama, A. Behavior of effluents discharged into shallow coastal waters under the influence of spring-neap tidal currents. Environ Fluid Mech 22, 5–32 (2022). https://doi.org/10.1007/s10652-021-09826-1

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  • DOI: https://doi.org/10.1007/s10652-021-09826-1

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