Initial dilution equations for wastewater discharge: Example of non-buoyant jet in wave-following-current environment

A new approach based on the multigene genetic-programming (MGGP) technique is proposed to predict initial dilution of vertical buoyant jets subjected to lateral confinement. The models are trained and tested using experimental data, and the good matches demonstrate the generalization and predictive capabilities of the evolved MGGP-based models. The best Pareto-optimal MGGP-based model is also compared with the model evolved using a single-gene genetic-programming (SGGP) algorithm and an existing regression-based empirical equation. The comparisons reveal the superiority of the MGGP-based model. This study confirms that the MGGP technique is promising in evolving an explicit, accurate, and compact model, and the developed models can be employed to estimate effectively and efficiently the dilution properties of a laterally confined vertical buoyant jet.

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The Effects of a Moving Stratified Fluid on Initial Dilution of a Single Buoyant Jet

Advanced Series on Ocean Engineering - Ocean Disposal of Wastewater ◽

10.1142/9789812796028_0012 ◽

1993 ◽

pp. 186-196

Keyword(s):

Stratified Fluid ◽

Buoyant Jet ◽

Initial Dilution

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Model and Numerical Studies on Buoyant Jets in Crossflows: Yantai Marine Outfall System

Water Science & Technology ◽

10.2166/wst.1991.0123 ◽

1991 ◽

Vol 24 (5) ◽

pp. 175-181

Author(s):

Guowei Gu ◽

Heping Wei ◽

Bute Cai

Keyword(s):

Near Field ◽

Model Tests ◽

Buoyant Jet ◽

Buoyant Jets ◽

Integral Control ◽

Initial Dilution ◽

Numerical Studies ◽

Model Research ◽

Marine Outfall ◽

Rise Height

The main object of this model research is to study the dilution and diffusion of buoyant jets in crossflows. Combining with a prototype project of municipal sewerage discharge for Yantai, the model tests were taken. Froude's law was used to design the model, and an undistorted model has been adopted. The length scale is taken as l:100. Six integral control equations were deduced, with which we can calculate initial dilution, rise height and spreading width of buoyant jet in the near field. According to model tests and calculated results of integral control equations, we suggest the essential parameters to be used in the diffuser project at Yantai.

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Modeling and Animation of Wastewater Disposal in the Ocean Environment

Water Science & Technology ◽

10.2166/wst.1991.0155 ◽

1991 ◽

Vol 24 (6) ◽

pp. 179-185 ◽

Cited By ~ 1

Author(s):

A. E. Bale ◽

G. T. Orlob

Keyword(s):

Wastewater Discharge ◽

Impact Zone ◽

Wastewater Disposal ◽

User Input ◽

Initial Dilution ◽

Interactive Computer Program ◽

Advection Dispersion ◽

Large Audience ◽

Ocean Environment ◽

Turbulent Velocity Field

DisPatch, a graphically oriented interactive computer program, has been designed to model the far-field transport of wastewater discharge in the ocean environment Implemented on a microcomputer, DisPatch features high-resolution graphics, menus, and dialog boxes to facilitate user input of boundary conditions in such a way as to be accessible to a large audience of potential users. The DisPatch model is developed from the application of the advection-dispersion equation to a horizontally homogeneous, vertically averaged, turbulent velocity field representing the ocean environment in which a “patch” of discharged wastewater is presumed to travel. Designed to accept either average values or a stochastically generated set of values for initial dilution and trapping height, DisPatch displays the path of each discharge event onscreen as an animation of calculated patch position and dimension. Results are presented in the form of an elevation view of contaminant impact at a user-defined impact zone.

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The Effect of Currents on the Initial Dilution of a Buoyant Jet Rising in an Unstratified Fluid

Advanced Series on Ocean Engineering - Ocean Disposal of Wastewater ◽

10.1142/9789812796028_0011 ◽

1993 ◽

pp. 137-185

Keyword(s):

Buoyant Jet ◽

Initial Dilution

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Initial dilution of a vertical round non-buoyant jet in wavy cross-flow environment

China Ocean Engineering ◽

10.1007/s13344-015-0071-6 ◽

2015 ◽

Vol 29 (6) ◽

pp. 847-858 ◽

Cited By ~ 1

Author(s):

Ya-na Wang ◽

Yong-ping Chen ◽

Zhen-shan Xu ◽

Yi Pan ◽

Chang-kuan Zhang ◽

...

Keyword(s):

Cross Flow ◽

Buoyant Jet ◽

Flow Environment ◽

Initial Dilution

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Uncertainty analysis of ocean outfalls

Canadian Journal of Civil Engineering ◽

10.1139/l99-005 ◽

1999 ◽

Vol 26 (4) ◽

pp. 434-444 ◽

Cited By ~ 4

Author(s):

Mukhtasor ◽

James J Sharp ◽

Leonard M Lye

Keyword(s):

Monte Carlo ◽

Uncertainty Analysis ◽

Quality Standard ◽

Design Parameters ◽

Buoyant Jet ◽

Bacterial Concentration ◽

Bacterial Pollution ◽

Initial Dilution ◽

Areas Of Interest ◽

Probabilistic Nature

Variability and uncertainty are inherent in an ocean outfall system and will cause variation in estimated initial dilution and bacterial concentration at areas of interest near the discharge. Uncertainty analysis is therefore useful in evaluating the likely performance of the outfall and in determining if it will comply with relevant government regulations. This paper identifies the uncertainty in outfall design parameters for an outfall involving a single, horizontal, round buoyant jet discharging into an unstratified seawater environment. A case study based on data from the Spaniard's Bay outfall in Newfoundland, and using a Monte Carlo simulation, is presented and compared with some, limited, site data that are available. It is shown that the analysis adequately describes the probabilistic nature of the initial dilution and bacterial concentration and that it would be useful for practical design purposes.Key words: bacterial pollution, buoyant jet, initial dilution, Monte Carlo simulations, probabilistic design, sewage discharge, ocean outfalls, uncertainty analysis, water quality standard.

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