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Evaluation of Atmospheric Condition of Ahmedabad, Gujarat, India

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  By Niki Gopani¹* and Dr. Akshey Bhargav² May 2011  Asst. Professor at Kalol Institute of Technology & Research Centre, Kalol,Gujarat, India1. Principal of Engineering, Kalol Institute of Technology & Research Centre,Kalol, Gujarat, India2.  AbstractUnderstanding of the atmospheric conditions of a particular area is veryimportant to assess the dispersion ability of pollutants from any source of air pollution. The wind rose diagrams are the important tools to representgraphically the percentage frequency distribution of wind speed and directionfor a given period & location. Similarly, the atmospheric stability is animportant parameter which determines the ability of pollutants to disperse inthe atmosphere. The analysis of atmospheric conditions reveals that Ahmedabad region falls under highly unstable atmospheric stability classwhich may be considered good for dispersion of air pollutants. More ever, theplume rise from any elevated source would be relatively higher for effectivedispersion of air pollutants resulting into less ground level concentration of air pollutants over a period of time and space. Keywords : Wind rose, pollutants, air pollution, Atmospheric stability, plume rise Present Study  An effort has been made in the present research work to prepare monthly, seasonal andannual wind roses and stability roses with a view to analyze the atmospheric conditions of  Ahmedabad, Gujarat.The wind roses are the important tools for overall spatial planning and environmental policyparameter. It provides the overall scenario of sectoral winds along with their speeds tofacilitate the planners to identify the locations or areas for residential colonies, commercialactivities, and industrial areas & so on so forth.These wind roses are prepared with the help of “wind rose plot view” software developed byLakes Environmental by making use of 3 hourly wind speed and wind direction data in theprescribed format. The wind speed and wind direction dataIn the present study has been obtained from the Indian Meteorological Department, Ahmedabad.These roses have the following applications:Urban Planning Evaluation of Atmospheric Condition of Ahmedabad, Gujarat, India - N...http://www.eco-web.com/edi/110531.html1 of 510/21/2014 12:54 PM   Annual Wind RoseWinter Wind RoseSummer Wind Rose Siting of industrial locations including chimney & other air polluting sourceIndustrial zoning & industrial estate planning Air pollution modeling.Disaster ManagementStreet layoutVentilation of urban, industrial and housingEnvironmental Impact Assessment study.OceanographyWind Energy Agriculture Engineering Ambient Air Monitoring Noise Impact ModelingSimilarly, the atmospheric stability roses represent graphically the % frequency distribution of different stability classes in different directions for a specified period and location. Theapplication of stability roses are mainly in the air dispersion modeling which predict groundlevel air pollutant concentrations for a given air polluting source under different stabilityconditions.  Annual Wind Rose The annual average wind rose tends to indicate predominantwind direction as SW with predominant south-westerly windsector, followed by NW, NE & SE wind sectors.The pre-dominant wind speed is in the range of 0.5 to 2.0m/s followed by wind range of 2.0 to 3.0 m/s & 3.0 to 5.0m/s. Majority of the winds have been observed below 5 m/s.The percentage of calm winds is also significant with 21.40% Winter Wind Rose Similarly, winter wind rose tends to indicate predominantwind direction blowing as NE along with predominant north-easterly wind sector followed by NW.The pre-dominant wind speed is in the range of 0.5 to 2.0m/s followed by wind range of 2.0 to 3.0 m/s & 3.0 to 5.0 m/sand > 6 m/s. Majority of the winds have been observedbelow 5 m/s. The percentage of calm winds is alsosignificant with 29.38% Summer Wind Rose Moreover, summer wind rose tends to indicate predominantwind direction as SW along with predominant south-westerlywind sector followed by NW.The pre-dominant wind speed is in the range of 0.5 to 2.0m/s followed by wind range of 2.0 to 3.0 m/s & 3.0 to 5.0 m/s Evaluation of Atmospheric Condition of Ahmedabad, Gujarat, India - N...http://www.eco-web.com/edi/110531.html2 of 510/21/2014 12:54 PM  Monsoon Wind RosePost Monsoon Wind Rose and > 6 m/s. Majority of the winds have been observedbelow 5 m/s. The percentage of calm winds is 11.1 Monsoon Wind Rose Monsoon wind rose tends to indicate majority of predominantwind direction as SW along with predominant south westerlywind sector followed by NW.The pre-dominant wind speed is in the range of 2.0 to 3.0m/s followed by wind range of 0.5 to 2.0 m/s & 3.0 to 5.0 m/sand > 6 m/s. Majority of the winds have been observedbelow 5 m/s. The percentage of calm winds is 18.89. Post Monsoon Windrose Finally, post monsoon average wind rose tends to indicatepredominant wind direction as NW along with predominantnorth-westerly wind sector followed by NE, SW & SE.The pre-dominant wind speed is in the range of 0.5 to 2.0m/s followed by wind range of 2.0 to 3.0 m/s & 3.0 to 5.0m/s. Majority of the winds have been observed below 5 m/s.The percentage of calm winds are quite significant of theorder of 38.31.The analysis of seasonal wind roses would show that thepredominant wind direction is SW during summer &monsoon where as NE during winter and NW in postmonsoon. The pre-dominant wind speed is in the range of 0.5 to 2.0 m/s during summer, winter and post monsoonseason for monsoon season pre-dominant wind speed is inthe range of 2.0 to 3.0 m/s.The analysis of Annual wind rose reveals the fact thepredominant wind direction is SW with predominant south-westerly wind sector, followed by NW, NE & SE wind sectorsand in all the cases the average wind speeds are less than1m/s which can be classified as low wind speeds during2009 for Ahmedabad city. The calm conditions during 2009 are of the order of around 21.40%.The atmospheric stability is defined as the ability of the atmosphere for the dispersion of air pollutants released from various air polluting sources.The atmospheric stability is further classified under six categories starting from category A tocategory F. The atmospheric category A represents highly unstable atmosphere followed by Bas unstable, C as slightly unstable, D as neutral, E as stable and F as highly stable. Highlyunstable atmosphere is good for dispersion of air pollutants where as highly stable is knownto have poor dispersion ability.  Atmospheric stability roses and their analysis The atmospheric stability roses are defined as the graphical representation of the percentage Evaluation of Atmospheric Condition of Ahmedabad, Gujarat, India - N...http://www.eco-web.com/edi/110531.html3 of 510/21/2014 12:54 PM   Annual Stability RosesWinter Stability RosesSummer Stability RosesMonsoon Stability Roses frequency of different stability classes in different directions. These stability roses are primarilyused in the air dispersion modeling for the prediction of air pollutant concentration over aperiod of time and space under different atmospheric stabilities.The frequency distributions of different stability classes are done with the help of PasquillStability Classes table and the stability roses are prepared with the help of WRPROVIEW Software. An effort has also been made to prepare Atmospheric stability roses with a view to assess thedispersion ability of the air pollutants in the atmosphere.The seasonal & annual stability roses had been prepared and shown in figures, the details of which are given here under.The Annual stability rose for 2009 as per figure above showsatmospheric stability “A”  as predominant with 33.91% of occurrence with predominant wind direction SW followed byNW, NE & SE.Similarly, the stability rose for the Season winter of 2009 asper above figure shows atmospheric stability “A”  aspredominant with 67.84% of occurrence with predominantwind direction NE which is followed by NW and N.The stability rose for the Season Summer of 2009 as per figure above again shows atmospheric stability “A”  aspredominant with 30.12% of occurrence with predominantwind direction SW along with predominant south-westerlywind sector followed by NWSimilarly, the stability rose for the Season Monsoon of 2009as per above figure shows atmospheric stability “B”  aspredominant with 31.9 % of occurrence with predominantwind direction SW along with predominant south westerlywind sector. Post Monsoon Stability Roses The stability rose for the Season Post Monsoon of 2009 asper figure above again shows atmospheric stability “A” aspredominant with 38.3% of occurrence with predominantwind direction NW along with predominant north-westerlywind sector followed by NE, SW & SE.The analysis of monthly stability roses reveals the fact thatthe atmospheric condition falls under category A which isclassified as highly unstable. The % of occurrence under this category ranges from a minimum of 27.8% in the monthof November 2009 whereas maximum of 48.66% in February2009. The other atmospheric class “B” occurs in May, June,July and august month. The stability class B ranges from33.46 to 37.90 %. Evaluation of Atmospheric Condition of Ahmedabad, Gujarat, India - N...http://www.eco-web.com/edi/110531.html4 of 510/21/2014 12:54 PM
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