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Algorithms II

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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+ U_a² 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(ρ_a- ρ₀)/ ρ₀

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

ρ_a=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: K_y(m²/s)=3x10^-5 B^4/3.

B=initial plume width(m)

Vertical dispersion: K_z(m²/s)=4x10^-3 U_a e

e= thickness of the mixing layer

U_a=horizontal ambient velocity (m/s)

ALGORITHMS: Algorithms I - Algorithms II - Algorithms III - Algorithms IV - Algorithms V - Algorithms VI

Canarina Algoritmos Numéricos, S.L.

Environmental software solutions

Software para contaminación del medio ambiente

Canary Islands, Spain

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European network on pollution · European Union

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funded by the European Commission through the

6th Framework Programme for Research and Development

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DESCAR: DESCAR: water pollution - Data I - Algorithms I - Pollutants I

SOLUTIONS: DESCAR: water pollution - Advantages - Price

INPUT DATA: Data I - Data II - Data III - Import - Commands - Graphs I - Graphs II

ALGORITHMS: Algorithms I - Algorithms II - Algorithms III - Algorithms IV - Algorithms V - Algorithms VI

POLLUTANTS: Pollutants I - Pollutants II - The sea I - The sea II - Pycnocline

DESCAR software solutions: This application has been used in great number of environmental reports, courses and water pollution studies in the last years. We currently have users in more than 10 countries.

Devon - environmental company - environmental engineers -

Lincolnshire - groundwater environmental services - enviro consultant - environmental management systems -

Cumbria - environmental planning consulting - environmental research software

Suffolk - water contamination - water conservation - environmental research software

Aberdeen - water quality - contaminated water supply - contaminated ground water -

Lincolnshire - contaminated water disposal - cheam water contamination - water contamination map

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Bath - water contamination cases - water contamination reports - water contamination in Sutton -

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Cornualles - environmental audit - environmental auditing - environmental audit guide -

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Bath - objectives of environmental audit - environmental auditing software - environmental compliance auditing -

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Belfast - environmental risk management - environmental risk assessment - environmental insurance -

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Devon - environmental compliance limited - environmental compliance associates -

Lincolnshire - environmental management software - environmental auditing -

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Aberdeen - environmental training and compliance - environmental compliance certificate - consultant

Cumbria - environmental healthcare - environmental compliance audit checklist - environmental non compliance -

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Armagh - group - corporate environmental compliance - environmental compliance specialists

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Belfast - environmental compliance insider - environmental compliance alert - cost of environmental compliance

Suffolk - environmental forestry - environmental indicators -

Somerset - environmental experts - pollution experts - pollution expert -

Aberdeen - environmental deforestation - air pollution experts - biodiversity experts -

Armagh - sustainability experts - sustainable development experts - environmental sustainable development -

Belfast - environmental government - environmental eu - community experts -

Birmingham - environmental project - environmental report - environmental land use -

Bangor - enviro expert - ecology experts - ecology expert -

Bath - environmental research - environmental safety - environmental infrastructure -

Bradford - environmental planning - environmental natural resources - environmental community -

Brighton & Hove - environmental economic development - environmental strategy - land experts -

Nottingham - environmental conservation - land use experts - environmental health -

Oxford - environmental economics - environmental population - environmental acid rain -

Bristol - environmental climate change - conservation experts - infrastructure experts -

Cambridge - environmental policies - environmental industry - environmental management -

Peterborough - environmental activities - environmental water pollution - environmental economy -

Plymouth - agriculture experts - environmental air pollution - forestry experts -

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.