IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 2: Coastal Hydraulics: Form and Function : Lagrangian simulation of sewage effluent dispersion in a density - stratified tidal channel
Lagrangian simulation of sewage effluent dispersion in a density - stratified tidal channel
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This paper describes the development of a particle-tracking model which predicts the trajectories of particles that apportion waste effluents discharged into coastal waters. The subsequent spreading of the effluents is simulated by a large number of particles evolving as clouds. The evolving cloud patterns are predicted for given time-dependent ambient currents and stratification. The model allows for advection, Fickian horizontal diffusion and Richardson number-dependent vertical diffusion. The model is applied to a discharge of waste effluents into the Burrard Inlet in British Columbia, Canada, where the ambient currents are tidally-driven and the ambient stratification results from river freshwater inflows. This application uses field measurements of ambient conditions as model input. Vertical profiles of effluent concentration derived from simulated particle distributions compare well with field measurements of effluent concentration. The model has shown advantages in handling large spatial gradients of the concentration field, and serves as a useful water-quality modelling tool.
File Size : 799,426 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 2: Coastal Hydraulics: Form and Function
Date Published : 10/07/2011
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