CALPUFF-CALMET Modeling System

CALPUFF-CALMET Modeling System 1. Introduction Nowadays, due to the fast expansion of industrial development and population increase, air pollution has become one of the most serious problems in the world, especially in large cities and consequently, the problem of air pollution and its control has become increasingly. Fossil fuel combustion, especially which based on oil and coal is one of the major causes of the environmental problems affecting both local and global levels. However, several countries are still using fossil fuels as primary energy, especially in developing countries. Electricity consumption in Iran has experienced a considerable growth during recent years because of economical development, industrialization and population increase. In 1973, electric energy generation per capita was 310 kWh, which increased to 2935 kWh in 2008. Electricity generation using fossil fuels has destructive effects on environment. Due to Irans environmental conditions, electricity generation is mainly performed by thermal power plants, so that near 85% of the required electric energy is produced by thermal power plants. Gas-fired power plants are the dominant part which accounted up to 62% of total power generation. Oil-fired power plants generated 22.4% and 14.7% produced from hydroelectric plants. Although hydroelectric plants make 14.7% proportion of plants in Iran, these plants have generated only 5.1% of the power due to a fall in precipitation over the past few years. Natural gas (71.3%) is the largest source of fuel for electricity generation followed by heavy oil (15.8%) and gas oil (12.4%). Although, the main fuel of power plants is gas, the environmental problems are still concerned Air quality is a major determinant of human health. Meteorology plays a great role in determining air quality changes downwind of emission sources. Both the wind and atmospheric stability greatly affect dispersion conditions. Local influences due to terrain and land-cover factors can also be important. Air dispersion and deposition models are tools for estimating concentrations of air pollutants and deposition rates due to industrial or other emission sources (Prince Rupert Airshed Study). Air quality models are instrumental in providing valuable insights into the processes involved in the transport, dispersion and chemical transformation of pollutants in the atmosphere .These models use mathematical equations and numerical methods to describe the concepts involved in the atmosphere. In recent years, CALPUFF model has good performance in the simulation of many kinds of pollutants under complicated topography, especially in the area larger than 50 km. CALPUFF can be run in any specific location around the world, and for any modeling type period selected by the user. Due to its flexibility, CALPUFF has been used in several research studies. Over the past years, several CALPUFF-aided case studies have been published. Shiyao Li et al. (2016) used CALPUFF model to simulate the spatial distribution of sulfur dioxide in Urumqi and analyzes the source contribution to areas where the SO2 concentration is high. Prueksakorn et al. (2014) applied WRF/CALPUFF modeling system and multimonitoring methods to investigate the effect of seasonal variations on odor dispersion in Changwon City of South Korea. Abdul-Wahab et al. (2011) used CALPUFF software to measure and simulate the dispersion of sulfur dioxide (SO2) at the Mina Al-Fahal Refinery in the Sultanate of Oman. Abdul-Wahab et al. (2013) used CALPUFF to study the effect of meteorological conditions on the dispersion of an accidental release of hydrogen sulfide (H2S). Abdul-Wahab et al. (2015) applied CALPUFF to assess the quality of the proposed Miller Braeside quarry expansion in Canada. Hyung-Don Lee et al. (2014) used WRF-CALPUFF software to simulate concentration distributi ons of typical air pollutants (PM10 and SO2) in the Ulsan Petrochemical Industrial Complex (UPIC), and statistics are computed to determine the models ability to simulate observations. In this study, a CALMET diagnostic model nested to WRF model simulation is evaluated by comparison to surface air measurements, along specific periods. Then the CALPUFF dispersion model was used to simulate and predict the concentration of SO2, NOX, CO and PM10 that are emitted from the Shahid-Montazeri power plant (SMPP) of Esfahan, Iran.   The main goal of this study is to evaluate the capability of the CALPUFF model to simulate the concentrations of SO2, NOX, CO and PM10 in the nearby of power plant for special topographical and climatological conditions of the study area. First, the amounts of pollution exhausted from the stacks and the ambient concentrations of pollution due to the emitted gases from the stacks of Shahid-Montazeri power plant have been monitored in four receptors (Figure 1). Then the ambient concentration levels of pollution have been simulated for the receptors, using CALPPUF Lagrangian Gaussian puff model. Finally, the comparison of model prediction results and the monitored concentrations have been done through statistical analysis. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 2. Model description Technical description of CALPUFF-CALMET modeling system CALPUFF is one of the US Environmental Protection Agencys (EPA) preferred models for assessing transport of pollutants and their effects, on a case-by-case basis, or for certain near-field applications involving complex meteorological conditions. The modeling system consists of three main components and a set of preprocessing and post processing programs. The main components of the modeling system are CALMET (a diagnostic 3-dimensional meteorological model), CALPUFF (an air quality dispersion model) and CALPOST (a post processing package). CALMET is a diagnostic meteorological model which can make use of topography, land type, meteorological observation data and meteorological simulation data to diagnosis of wind and temperature fields based on the mass conservation equation. Besides the wind and temperature fields, CALMET determines the 2D fields of micro meteorological variables needed to carry out dispersion simulations (mixing height, Monin Obukhov length, friction velocity, convective velocity and others). The quality of a meteorological preprocessor is one of the main determinants of the overall quality of the air dispersion model, and this is particularly true for the CALPUFF/CALMET modeling system in a wide range of conditions. The main purpose of CALMET is to obtain the best possible meteorological data based on the available information. In particular, CALMET can receive measured data, modeled data (i.e., generated by a meteorological model like MM5 or WRF), or both. When a high-resolution terrain data set is available, CALMET is capable of using this information to estimate local deviations from meteorological data measured or modeled at a coarser resolution (Scire J.S). CALPUFF is a multi-species non-steady-state puff dispersion model that simulates the effects of time and space varying meteorological conditions on pollutant transport, transformation, and removal. CALPUFF allows the use of on-site turbulence measurements of the horizontal and vertical Gaussian dispersion coefficients, but also allows for the use of similarity theory and micrometeorological variables, derived from meteorological observations and surface characteristics, to obtain these coefficients. CALPUFF utilizes a Gaussian puff formulation to calculate the concentration of a pollutant (or spores, in our application) at any given location downwind, and the deposition at users specified locations at ground level (Use of a complex air pollution model to estimate W. Pfender). CALPOST can extract CALPUFF simulation data according to customers demand (Spatial distribution and source analysis of SO2 concentration in Urumqi). 3. Methodology a. Description of study area and model domain Isfahan is located in the central Iran inside the plains stretching along the Zayandeh Rood River. The city is located in a relatively mountainous area in the center of the Iranian Plateau and stretches from the snowy Zagros Mountains in the West to the East and North-central deserts of Iran. There exist a variety of climatic conditions in the city thanks to regions with different altitudes. The outstanding features of Isfahan are little rainfall, average less than 125 mm. Isfahan is located in 32.67N, 51.83E, and elevation 1550-1650 m, with more than 1.7 million population (https://amar.sci.org.ir/index_e.aspx). There are more than a million automotive and heavy duty vehicles using diesels, gasoline, and natural gas in Isfahan. This city is known as the largest industrialized region in Iran, where there are many industrial states, steel companies, and etc. There is also one of the biggest electric power plant of Iran. Shahid-Montazeri steam power plant of Esfahan is located 15 km to the northwest of Isfahan along the Isfahan-Tehran highway next to Isfahan Refinery and Petrochemical Complex in a 2.2 million m2 land (Evaluation of synchronous execution of full repowering and solar assisting in a 200 MW steam power plant, a case study) (Figure 1). This power plant has 8 similar steam units each with a capacity of 200 MW. Montazeri plant is a steam power plant which is recently use natural gas. However, Montazeri uses heavy oil during the cold days due to increasing the domestic heating. The study area is located around as Montazeri power plant, with a total capacity of 1600 MW and two large smoke stacks (205 agl-m height, above ground level meters height and 1725 base elevetion) with four independent liners (one per boiler) in the same concrete shaft that are selected point sources (Figure 2).   Therefore, it should be considered as eight different point sources practically located at the same point; alternatively, it can be considered as a two point sources, with an emission and stack section as the sum of the four liners (Validation of CALMET/CALPUFF model simulations around a large power plant stack). In this study, dispersion of SO2, Nox, and particulate matter (pm10) emitted from the Montazeri power plant over the Esfahan basin was evaluated for two periods of days (from 10 to 31 January 2000). A simulation domain of 100100 km2 was selected by the power plant positioned at the center, in order to cover any pollutant source local impact. This area is divided into 10000 grids, the size of which is 1 km 1 km. The southwest corner of the domain is located at longitude 50.96E, latitude 32.35N. The northeast corner is located at longitude 52.03E, latitude 33.24N and the elevation of the study area varies from 1500 to 2800 m. Table 1 represents the information model input which is used for defining the case study meteorological domain. b. Emission data The main sources of pollutants in Montazeri power plant are resulted from exhaust gases of the stacks which cause air pollution in the power plant area and its surrounding. The values of SO2, NO, NO2 and PM10 emissions from the stacks of Montazeri power plant have been measured by Testo 350-XL device for gases and ISOSTACK BASIC device for particulate maater, during the period of simulation. The data of stack characteristics and the emission rate of the pollutant have been presented in Tables 2. This release huge quantities of sulfur dioxide due to Steam power plants of Iran are not equipped with FGD systems to reduce SO2 emissions, and thereby, the emission factor of this pollutant is only influenced by electricity generation efficiency and sulfur percentage of the consumed heavy oil. In this study, we used data observed from four monitoring station to measure so2, nox and pm 10 (figure 1). Location of the monitoring stations (receptors) has been presented in Cartesian coordinate system in Table 2. Measurements at the monitoring station were done based on the average hour concentrations. c. Meteorological data Surface hourly observations in TD-3505 format were obtained from the Integrated Surface Hourly Database (ISHD) supported by the US National Climatic Data Center (NCDC) . Data was extracted hourly for the entire modeling period from March 10, 2012 at 00h00 UTC to March 12, 2012 at 23h00 LST. Due to the large number of missing data of the other surface meteorological parameters (such as: pressure, ceiling height and cloud cover) only temperature and wind speed were validated.   The purpose of extracting this data was only to evaluate the accuracy of the calmet model to simulate the vertical profiles of wind and temperature. Figure 3 shows the location of the meteorological station used in this study and a description of the surface stations is provided in table 3 d. Modeling approach The initial phase of CALPUFF modeling system involves the derivation of three dimensional meteorological wind fields for the study area using CALMET a diagnostic meteorological model (Estimated Public Health Exposure to H2S Emissions from a Sour Gas Well Blowout in Kaixian County, China). The input of CALMET model includes geophysical data (land use categories and terrain elevations), meteorological data (surface and upper air meteorological observations or meteorological fields generated by prognostic models) (A study of the effects of vehicle emissions on the atmosphere of Sultan Qaboos University in Oman). Due to lack of the surface and upper air meteorological data in the study area we used the Weather Research and Forecasting (WRF: version 3.5.1) model to simulate of meteorological conditions. The Weather Research and Forecasting (WRF), a prognostic meteorological model, was used to calculate the hourly three-dimensional meteorological fields For CALMET model (Applications of WR F/CALPUFF modeling system and multi-monitoring). The WRF model description presented in Table 2. Initial conditions and boundary conditions are provided by the 1.0 degree National Centers for Environmental Prediction (NCEP) Final Analysis (FNL) at 6-h intervals (Use of high-resolution MM5/CALMET/CALPUFF system: SO2 apportionment to air quality in Hong Kong). Data in WRF output files can be interpreted and converted to a format compatible with CALMET by CALWRF program (Scire et. al.2000b). CALMET requires geophysical data to characterize the terrain and land use parameters that potentially affect dispersion. Terrain features affect flows, create turbulence in the atmosphere, and are potentially subjected to higher concentrations of elevated puffs. Different land use types exhibit variable characteristics such as surface roughness, albedo, Bowen ratio, and leafarea index that also affect turbulence and dispersion (The use of an atmospheric dispersion model to determine influence regions in the Prince George, B.C.). Terrain elevation for the CALMET was obtained using the TERREL processor. The model was executed with terrain maps provided by Consultative Group on International Agricultural Research (CGIAR) and the Consortium for Spatial Information (CSI) website (http://www.cgiar-csi.org/data/srtm-90m-digital-elevation-database-v4-1), Data were collected as part of the Shuttle Radar Topographic Mission (SRTM) and processed by CSI into 5 x 5 degree tiles at 90-metre resolution. Land characteristics in the domain were extracted using the CALMET pre-processor CTGPROC. The input land use maps were obtained from the United States Geological Survey (USGS) websites in GeoTIFF format. Terrain characteristics map in the study area has been displayed in Fig. 3. To provide meteorological input to the CALPUFF model, the CALMET diagnostic model and WRF mesoscale prognostic model were coupled. The CALPUFF model uses the output file from CALMET together with source, receptor, and chemical reaction information to predict hourly concentrations. e. Statistical Data Analysis To determine the reliability of the simulation data, verification of simulated values using the WRF and CALMET models was conducted for surface temperature and wind speed at surface monitoring station using several statistical indicators. The statistical verification of model performance in this study was performed using four statistical indicators namely the Bias Error (B), Gross Error (E), Fractional Bias (FB), Normalized Mean Square Error (NMSE), Root Mean Square Error (RMSE) and Index of Agreement (IOA). The formulas used to derive these four indicators are given in Equations

Animals In Our Society Essay -- Marketing Animals

â€Å"Much as we might want to understand animals at a level deeper than pop culture, we can only understand them in terms of our own experiences, language and emotions, and interpreted within our social, historical and cultural contexts. The only way we have of understanding animals is to recognize that ‘when we gaze at animals we hold up a mirror to ourselves’ (Corbett, 176). Animal messages are brought to us by the pop culture industry, whose job it is to create, disseminate, and sell meaning. In most cases, they aren’t selling you a moose, but what a moose means to you for example – the characteristics and qualities that you and most people associate with the species. Based on common meanings presented to us from an early age, animals are the perfect shorthand communication symbol. We use animals as devices, metaphors and symbols for a great deal of our expressions and ideas† (Corbett, 179). For years, animals have been at the center of our world; â€Å"the lives of animals and humans have been inextricably intertwined† (Corbett, 178). Thus, based on the close relationship between animals and humans throughout history, in my opinion animals have been used in all cultures to reflect the nature of humanity, symbolizing societal and individual characteristics. The traits of animals are very simple to observe and recognize, whereas human behavior is more intricate and difficult to describe. Animals are familiar creatures to us, which mutely encourage projection of people’s emotions and attitudes onto them. Animals can be used and as we have learned most recently, they are used to convey deep dimensions of human feelings and ideas. When I think of animals, their representation and their symbolism in our society, I immediately think of ani... ...in this piece, would be to dive into researching the answer to this: the fact that there I think there is something very clever to be said about a corporation that uses an animal to talk to its prospects, but are we really sure what that is? Are we sure what to say about a society that listens, and responds to spokescreatures? Perhaps we find them more credible than spokespersons. Do we? Works Cited Corbett, Julia B. Communicating Nature: How We Create and Understand Environmental Messages. Washington, DC: Island, 2006. Print. 2. "Seven Top Animal Symbols Used By Company Name Generators." EzineArticles Submission - Submit Your Best Quality Original Articles For Massive Exposure, Ezine Publishers Get 25 Free Article Reprints. Web. 05 Dec. 2010. .

Feminism in the Handmaid’s Tale Essay

Some would argue that Margaret Atwood’s The Handmaid’s Tale is a book that pulls its ideas and beliefs about women and their place in society from the Bible. But based upon the novel, the Bible, and some writings by Christian writers, that is true, but highly skewed. Let’s begin by taking a look at how society is setup in The Handmaid’s Tale so we can have a clear understanding where the author is coming from. The whole premise is that women have lost all power, freedom, choice, and equality and are instead deemed either suitable for slave/maid type work or bearing children. Girls are taken to Rachel and Leah Re-education center, or the red center, as the girls living there knew it, and â€Å"indoctrinated† or brainwashed into the ideologies of the government and taught that their only role is to conceive children. They are also told that the structure of this society (Gilead) is better for women, more respectful and safe. Offred, the main character in the novel has a very monotonous and strict routine everyday that consists of shopping for the commander, the man of the house, and visiting the doctor frequently to be checked, and then undergo the ceremony. This ceremony is the emotionless, speechless sex that she has with commander in order to bear children because of the sudden drop in reproduction in the past society. Now that we have the groundwork laid, lets look at a couple ways they skew the role of women from what it is meant to be according to the Bible. The ceremony that they participate in includes reading from the Bible before engaging in sex. The only problem with that whole idea, is that they only read a small passage of one book every time, that speaks about a barren women urging her husband to lie with her servant so they may have a child. The problem with this is that it’s taken completely out of context. The backstory to Rachel, the barren woman, is that Jacob was supposed to be married to her after working for her father for seven years, but instead Laban, the father, gives his older daughter Leah to lie with Jacob. When he discovers he was tricked he tells Laban he will work another seven years if he can have Rachel as his wife. Because God saw that Rachel was much more loved than Leah, he made Rachel barren and blessed Leah with four children. This is why Rachel asked Jacob to lie with a servant girl; she was envious of her sister Leah (The Holy Bible ESV, Gen. 29-30). The way it is portrayed in the novel is just as a source of reason. The commander and the government need a way to convince women of society that what they are doing is good and it is what they are designed to do. The Bible also speaks in Genesis how man and woman were created in God’s image and how both are equally valuable. Women in Atwood’s The Handmaid’s Tale are not at all treated equal. Wayne Grudem says it well in his book Bible Doctrine, †¦and Paul emphasizes, â€Å"In the Lord, woman is not independent of man nor man of woman; for woman was made from man, so now man is born of woman† Both men and women are equally important; both depend on each; both are worthy of honor† (201). This quote really shows how incorrect the society of Gilead has interpreted the Bible and also how poorly they have viewed women. They claim the safest way to protect the women is to restrict all their rights and give them the opportunity of one of three positions in society, which of those three, they do not even get to select. There are few instances in the novel that represent love, affection, or care; and this would be in the previous world and then between Offred and Nick and even that is a lot of physical affection more than true love. The Bible clearly states in Ephesians 5, â€Å"Husbands, love your wives, as Christ loved the church and gave himself up for her†¦ In the same way husbands should love their wives as their own bodies. He who loves his wife loves himself. For no one ever hated his own flesh, but nourishes and cherishes it, just as Christ does the church† (Eph. 5). This whole idea is nowhere near represented in The Handmaid’s Tale. The commander is married to the wife almost as a status. He has total authority over her and because she is barren they do not even sleep together. To bare child, he lies with the Handmaid, and to have pleasure, he visits Jezebels, which is a strip club. Which brings up another point in which prostitution and pornography were two of the major staples in the State’s philosophy of keeping women protected, yet they still have clubs that the men visit to enjoy themselves. Some may argue that there is biblical text to support everything that was done, such as Titus 2:5, which states â€Å"†¦women are to be submissive to their own husbands† (Titus. 2. ). This verse is said amongst many other actions women should portray towards their husbands, but it is originally meant, all out of love for their husband and ultimately for their love of Christ. Gilead believes having authority over everyone’s lives and particularly complete control of women. This just one more example of the misconstrued biblical reference portrayed how they see fit. This whole concept of people pulling verses out of context and twisting them to what they want is why so many people have a hard time believing in the truth. It has been so misinterpreted to what people want to believe or how people want others to believe. Gilead’s focus is on reproduction, order, control, and power. They have just found a way to use religion as a tool for their own plans, and in doing so have butchered the entire meaning of the device they are using. One more example of this is through other biblical references in the language. The entire book uses a variety of religious or Biblical language which includes but is not limited to: soldiers being called angels, the domestic servants are called Marthas, the store Milk and Honey, and even vehicles carry religious terms such as behemoth or chariot. These terms are used to help solidify the State’s justification for their actions. Using Biblical terms allows them to continue to preach that everything they do is to protect and serve according to the Bible. Again the problem is that they pull what they want from context and don’t use it according to how the original author intended it for the original audience, or how God meant for us to live. Margaret Atwood wrote a great novel describing what life could be like; if suddenly all women were subject to men’s rule and forced to live under such rigid conditions due to society’s prior downturn. Although the basis of Gilead, and it’s ideas and beliefs were high misinterpreted passages and references of biblical text. As previously stated, if someone is going to use biblical and historical references to support a cause or form a governing society, they must have the facts straight. This means using them in context, and for the original intended purpose. Not changing them or falsifying them to fit your ideas and beliefs.

Comparison of the key management and leadership aspects of organisations in the private sector, public sector and not for profit sector Free Essay Example, 2000 words

Managers should also consider various needs of individuals when influencing people because employees are different. In organizational conflict and change, behavioral approach remains to be practical. It addresses the inevitability of conflict and proposes that conflicting individuals should be understood. Furthermore, it acknowledges that individual often resist change on social aspects. Workers are often organised into teams in the behavioural approach. This is because managers in most organisations are biased to a flatter organisational structure. Application of behavioural approach to management began in 1930’s as a reflection of Hawthorne’s expression of human relation movement and organisational behaviour development. The field of organisational behavior was developed to fill the gap left by early human relation experts who concentrated on inter-personal relations and gave little attention to the patterns of group behavior. As compared to human relations approach management, behavioral approach concentrates it efforts in the study of human behavior. Douglas, McGregor, Chester Barnard, Rensis Likert, Chris Argyris, Fredrick Hersberg, Warren G. Bennis, Mary Parker Follet, Abraham Maslow, and Robert Tannenbaum are some of the most distinguished human behaviour experts (scientists) who have contributed immensely to development of behavioral approach to management (Drucker, 1947). We will write a custom essay sample on Comparison of the key management and leadership aspects of organisations in the private sector, public sector and not for profit sector or any topic specifically for you Only $17.96 $11.86/pageorder now Human behaviour experts focused mainly on leadership, communication, motivation, organisational change and organisational conflicts. The research findings obtained by the human behaviour gurus have boosted the understanding of the organizational behavior. Human behaviour experts do not subscribe to the classical organizational structures. This is because the classical organizational structure applies traditional concept considered inappropriate at this age. The traditional concepts include narrow hierarchical authority, unity of command, relationships between line and staff, and narrow span of control. This hampers effective management. The classical organizational structures give managers room to dominate the work place unnecessarily. Consequently, subordinates become inactive and dependant on the managers. Behaviorists suggested that organizations should have flexible structures and that employee’s aptitude and potentials should determine t he jobs. Behavioral approach suggests that to measure and evaluate the performance standards of employees, relevant employees should be involved.