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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

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2.3 Near mixing zone and distant mixing zone

We need to know the place where the plume centerline crosses the water surface or picnocline layer. To calculate this point we will use U_a and the vertical velocity 

Multiport diffuser.- W=1,66(g’q)^1/3 being W the vertical velocity of the effluent (m/s).

Separated ports.- W=6,3(g’Q_b/H)^1/3 .

Single port.- W=6,3(g’Q/H)^1/3.

In the last two cases, H will be replaced by ymax when the water is stratified. The point localization with regard to the place where the plume centerline crosses the surface, gives us the near and distant mixing zone definitions.

2.4 Concentration calculation

The concentration value in a plume point is determined by the X,Y,Z coordinates and is given by the equation:

C(X,Y,Z)=(C₀/S) F₀(t)F₁(t)F₂(Y,t)F₃(Z,t)

C₀=pollutant concentration in the effluent

S=initial dilution

being t=X/U_a. F₀(t) takes into account non-conservative pollutants and is equal to:

F₀(t)=10^-t/T90

The F₀, F₁, F₂ and F₃ functions depend on being in near or distant mixing zone.

(a) Near mixing zone:

In such a case, the equations are

F₁(t)=1

F₂(Y,t)=(1/2)[erf[(B/2+Y)/(σ_y2^1/2)]+ erf[(B/2-Y)/(σ_y2^1/2)]]

F₃(Z,t)=(1/2)[erf[(e+Z)/(σ_z2^1/2)]+ erf[(e-Z)/(σ_z2^1/2)]]

being σ_y=(2K_yt)^1/2 and σ_z=(2K_zt)^1/2. The program calculats erf function by numerical integration. The the precision of integration method depends on the parameter N_int. Increasing N_int value, we increase the numeric convergence but we will need more time of calculation. We should look for an optimized value of N_int.

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

Canarina Algoritmos Numéricos, S.L.

Environmental software solutions

Software para impacto del medio ambiente  

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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.

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.