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Algorithms III · software · marine pollution

                                 

Applications 1: outfall modeling · discharge simulation and sewage · effluent modeling and wastewater · outfall and plume simulation · pycnocline · thermocline · ouftfall simulation and water quality · water contamination · effluent and water discharge ·  fluid flow modeling · flow analysis · environmental protection · environmental analysis

 

2. Stratified model

 

This model is official in Spain and it follows Orden del 13 de Julio de 1993 del Ministerio de Obras Públicas y Transportes del Reino de ESPAÑA, B.O.E. Martes 27 de Julio de 1993, página 22861, I. Disposiciones generales. Proyecto de conducciones de vertidos desde tierra al mar.

 

The stratification phenomena is the existence of two homogeneous water layers and separated by a thin thermocline layer. In such a case, we can say that the water is stratified. There is no exchange of pollutants through this picnocline layer. In case we suppose that a picnocline layer exists, we will be able to check the stability by means of the application of the following equation:

 

[u02 B+ Ua2 H]/[(u0 B g’)2/3 H] <0.54

u0=effluent velocity (m/s)

H=water depth at discharge position (m)

g’=reduced gravity acceleration (m/s2), g’=g(ρa- ρ0)/ ρ0

g=9,81m/s^2 (gravity acceleration)

ρa=water density (Kg/m3)

ρ0=effluent density (Kg/m3)

Typical values (pollutants):

Organic matter as DBO5 - 350g/m3

Suspended matter - 600g/m3

E. Coli - 1012 /m3

N2 (total) - 30 gN/m3

Effluent velocity - entre 0.6 y 0.8 m/s

Port diameter - 6cm

 

Dispersion coefficients:

Horizontal dispersion: Ky(m2/s)=3x10-5 B4/3.

B=initial plume width(m)

 

Vertical dispersion: Kz(m2/s)=4x10-3 Ua e

e= thickness of the mixing layer

Ua=horizontal ambient velocity (m/s)

 

 

 

         (air)           (noise)              (electrosmog)    

 

 

marine pollution

                                                                               

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Member of MAPO: European network on Marine Pollution.

 

 

 

 

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