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DESCAR:

DESCAR Solutions Advantages Price

Data I

Data II Advantages Average

Import Commands Graphs I

Graphs II Algorithms I Algorithms II Algorithms III Algorithms IV Algorithms V Algorithms VI Algorithms VII Pollutants I Pollutants II

The sea I

The sea II

Google maps

GIS

 

 

 

  

DESCAR software: algorithms III

                               

 

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)

 

 

Algorithms I -  Algorithms II - Algorithms III - Algorithms IV - Algorithms V - Algorithms VI - Algorithms VII

 

                                                                               

Canarina Algoritmos Numéricos, S.L.

Environmental software · environmental software solutions

Canary Islands, Spain

e-mail: Contact us

 

 

  

European Union · network on Pollution

Member of MAPO: European network on Marine Pollution.

Project funded by the European Commission

through the 6th Framework Programme for Research and Development

 

 

                               

 

DESCAR: water pollution - Solutions - Advantages - Price - Data I - Data II - Advantages - Temporal average - Import - Commands - Graphs I - Graphs II - Algorithms I -  Algorithms II - Algorithms III - Algorithms IV - Algorithms V - Algorithms VI - Algorithms VII - Pollutants I - Pollutants II - The sea I - The sea II - Google maps - GIS

 

Copyright © 2005 Canarina Algoritmos Numéricos, Sociedad Limitada Unipersonal CIF-B38803110 registered for electronic commerce in sheet TF-35526, sheet 1 of the volume 2.671 of the General Section, First Registration, Registro de la Propiedad Número 2 y Marcantil of , Spain. All rights reserved.