scholarly journals Using dispersion modeling for ground level concentration

MAUSAM ◽  
2021 ◽  
Vol 62 (2) ◽  
pp. 239-244
Author(s):  
KHALEDS.M. ESSA ◽  
FAWZIA MUBARAK
Keyword(s):  
Exact Solution ◽  
Short Range ◽  
Meteorological Data ◽  
Ground Level ◽  
Eddy Diffusivity ◽  
Dispersion Modeling ◽  
Mixing Height ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Ground Level Concentration

A short range model calculating ground-level concentration from elevated sources is estimated, which realized a Fickian-type formula. Taking the source and mixing height are functions of the wind velocity and eddy diffusivity profiles. The model estimated with an exact solution of the advection diffusion equation is compared with experimental ground level concentrations using meteorological data collected near the ground.

scholarly journals Maximum crosswind integrated ground level concentration in two stability classes

MAUSAM ◽  
2021 ◽  
Vol 64 (4) ◽  
pp. 655-662
Author(s):  
M.ABDEL WAHAB ◽  
KHALED SMESSA ◽  
M. EMBABY ◽  
SAWSAN EMELSAID
Keyword(s):  
Wind Speed ◽  
Laplace Transformation ◽  
Ground Level ◽  
Eddy Diffusivity ◽  
Concentration Data ◽  
Transformation Technique ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Ground Level Concentration ◽  
Vertical Height

bl 'kks/k i= esa fu"izHkkoh vkSj vfLFkj fLFkfr;ksa esa ØkWliou lekdfyr lkanz.k ysus ds fy, nks fn’kkvksa esa vfHkogu folj.k lehdj.k ¼ADE½ dks gy fd;k x;k gSA ykIykl :ikarj.k rduhd dk mi;ksx rFkk m/okZ/kj Å¡pkbZ ij vk/kkfjr iou xfr vkSj Hkaoj folj.k’khyrk dh leh{kk djrs gq, ;g gy fudkyk x;k gSA blds lkFk gh Hkw&Lrj  vkSj vf/kdre lkanz.kksa dk Hkh vkdyu fd;k x;k gSA geus bl ekWMy esa iwokZuqekfur vkSj izsf{kr lkanz.k vk¡dM+ksa ds e/; rqyuk djus ds fy, dksiugsxu ¼MsuekdZ½ ls fy, x, vkuqHkfod vk¡dM+ksa dk mi;ksx fd;k gSA  The advection diffusion equation (ADE) is solved in two directions to obtain the crosswind integrated concentration in neutral and unstable conditions. The solution is solved using Laplace transformation technique and considering the wind speed and eddy diffusivity depending on the vertical height. Also the ground level and maximum concentrations are estimated. We use in this model empirical data from Copenhagen (Denmark) to compare between predicted and observed concentration data.

scholarly journals INFLUENCE OF SETTLING VELOCITY OF PARTICULATE MATTER ON GROUND LEVEL CONCENTRATIONS

2016 ◽  
Vol 38 ◽  
pp. 560 ◽  
Author(s):  
Tiziano Tirabassi ◽  
Davidson Martin Moreira
Keyword(s):  
Particulate Matter ◽  
Analytical Solution ◽  
Diffusion Equation ◽  
Concentration Distribution ◽  
Settling Velocity ◽  
Atmospheric Stability ◽  
Ground Level ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Ground Level Concentration

The settling velocity and deposition of particulate matter on the earth's surface has been introduced in an analytical solution of advection-diffusion equation. The influence of particle diameters in ground level concentration distribution was investigated in function of different atmospheric stability condiyions 

scholarly journals A simple formula for the evaluation of value and position of ground level concentration from a point source

2018 ◽  
Vol 40 ◽  
pp. 69
Author(s):  
Tiziano Tirabassi ◽  
Daniela Buske
Keyword(s):  
Analytical Solution ◽  
Diffusion Equation ◽  
Point Source ◽  
Simple Formula ◽  
Ground Level ◽  
Approximate Expression ◽  
Simple Expression ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Ground Level Concentration

After setting realistic scenarios of the wind and diffusivity parameterizations the Ground Level Concentration is worked out by an analytical solution of the advection-diffusion equation, then an explicit approximate expression is provided for it allowing a simple expression for the position and value of the maximum.

Calculated Ground Level Concentration of Pollutants From Gas Turbine Using an Air Quality Display Model Computer Program

1974 ◽  
Author(s):  
N. R. Dibelius ◽  
George Touchton ◽  
Thomas Kane
Keyword(s):  
Air Quality ◽  
Computer Program ◽  
Gas Turbine ◽  
Meteorological Data ◽  
Ground Level ◽  
The United States ◽  
Combined Cycle ◽  
Ground Level Concentration ◽  
Model Computer ◽  
Two Machines

This paper contains the calculated ground level concentrations of air pollutants from 11 gas turbine models. These calculations were made using Charlotte, N.C. meteorological data. Four of these are simple cycle machines covering a range of size from 5050 hp to 65 MW and four are regenerative machines. Another three are combined cycle (STAG) machines, two machines having unfired and one having a fired heat recovery steam generator. The calculations were made using a slightly modified version of the United States Environmental Protection Agencies Air Quality Display Model Computer Program.

scholarly journals Studying the variation of eddy diffusivity on the behavior of advection-diffusion equation

2018 ◽  
Vol 7 (1) ◽  
pp. 10-14
Author(s):  
Khaled Sadek Mohamed Essa ◽  
Aziz Nazer Mina ◽  
Hany Saleh Hamdy ◽  
Fawzia Mubarak ◽  
Ayman Ali khalifa
Keyword(s):  
Diffusion Equation ◽  
Eddy Diffusivity ◽  
Advection Diffusion Equation ◽  
Advection Diffusion
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