A presente pesquisa trata da influência da verticalização na sensação térmica urbana, dentro de um contexto de diretrizes de compactação das cidades, aplicada à cidade de Maringá / PR, cujo clima é subtropical úmido. Pretende avaliar se o aumento do gabarito dos edifícios da região apontada, realizado de modo a respeitar o parcelamento e o uso e ocupação do solo, interfere no conforto térmico urbano, mediante a verificação do índice de temperatura fisiológica equivalente (PET). Seu desenvolvimento é realizado com base na análise de resultados obtidos por meio de ferramentas computacionais, especialmente o software ENVI-met, seguindo as seguintes etapas: 1. Histórico Urbanístico, em que se avalia o plano inicial da cidade e o seu perfil atual; 2. Caracterização Climática, na qual se elabora o arquivo climático do município, sua carta de ventos, bem como todos os tratamentos necessários para a aplicação do software; 3. Modelagem e Simulação, em que se define e constrói os cenários, para posterior simulação; 4. Avaliação Ambiental, em que se analisa a sensação térmica dos resultados da simulação. Por fim, mediante a avaliação dos resultados obtidos, demonstra-se que a verticalização, em climas subtropicais úmidos, pode ser utilizada como atenuação da sensação térmica. / This research deals with the influence of verticalization on urban thermal sensation, within a context of city compaction guidelines, applied to the city of Maringá / PR, whose climate is humid subtropical. The objective of this study is to evaluate whether the increase in the model of the buildings in the mentioned region, in order to respect the parceling and the use and occupation of the soil, interferes with the urban thermal comfort by checking the equivalent Physiological Temperature Index (PET). Its development will be carried out based on the analysis of results obtained through computational tools, especially the ENVI-met software, following the following steps: 1. Urban History, in which the initial plan of the city and its current profile will be evaluated; 2. Climatic Characterization, in which the climatic archive of the municipality, its chart of winds, as well as all the necessary treatments for the application of the software will be elaborated; 3. Modeling and Simulation, in which the scenarios will be defined and constructed, for later simulation; 4. Environmental Assessment, in which the thermal sensation of the results of the simulation will be analyzed. Finally, by means of the evaluation of the obtained results, it will be shown that the verticalization, in humid subtropical climates, can be used as attenuation of the thermal sensation.

Muitos são os benefícios provenientes da arborização de vias públicas, como aumento da vida útil do asfalto por meio do sombreamento, filtragem de poluentes, absorção de CO2, interceptação da água da chuva e da radiação solar e mitigação de ilhas de calor; porém, por questões culturais, é considerada muitas vezes pela população como algo negativo, cujas folhas entopem calhas, raízes destroem calçadas, troncos e folhas atrapalham fiação elétrica e, principalmente, elas estão susceptíveis às quedas. A pesquisa teve como objetivo estudar o comportamento das quedas de árvores no município de Piracicaba/SP, Brasil, com atenção especial ao regime de ventos na cidade, baseado em dados fornecidos pelo Corpo de Bombeiros de Piracicaba, Secretaria de Defesa do Meio Ambiente de Piracicaba (SEDEMA) e Estação Meteorológica da Escola Superior de Agricultura \"Luiz de Queiroz\" (ESALQ). De caráter inédito, o principal resultado foi a relação direta entre quedas e zonas urbanizadas, que, em constantes alterações no uso do solo, acabam por danificar a sustentação das árvores (raízes), fato justificado pela alta concentração de quedas na parte central (36,7%), com destaque para as estações da primavera e do verão, ou seja, ventos e chuvas, na qual, juntas, somaram 78,0% do total. O período de retorno esperado para ventos superiores a 75 km h-1, classificados como temporais na Escala de Vento de Beaufort, foi de 2,8 eventos por ano. Enquanto verificou-se o predomínio de ventos alísios de sudeste, pertencentes ao quarto quadrante, a direção das rajadas de vento teve maior variação e, assim, com predomínio daqueles ventos, é recomendável instalações de parques industriais nas zonas norte, noroeste e oeste, haja vista a importância de evitar que os poluentes adentrem a cidade. As espécies de maior vulnerabilidade foram: Pachira aquatica Aubl. (monguba), Handroanthus sp. (ipê roxo) e Tipuana tipu (Benth.) Kuntze (tipuana). Por meio de simulação microclimática computacional, utilizando o programa ENVI-met versão 3.1, em dois estudos de caso, sendo um em bairro residencial e outro na Praça José Bonifácio, foi possível identificar locais de maior atenção quanto às quedas de árvores, em função da rugosidade do local, capaz de alterar a velocidade e a direção do vento. / There are many benefits from public roads afforestation, such as longer pavement life through shading, filtering pollutants, CO2 absorption, intercepting rainfall and solar radiation and mitigating heat islands; however, due cultural issues, is often regarded by the population as something negative, whose leaves clog gutters, roots destroy sidewalks, stems and leaves disrupt electrical wiring and, mainly, they are susceptible to falls. The research aimed to study the behavior of falling trees in Piracicaba/SP, Brazil, with special attention to the wind regime in the city, based on data provided by the Piracicaba Fire Department, Secretariat of Defense of the Environment of Piracicaba (SEDEMA) and Meteorological Station Luiz de Queiroz College of Agriculture (ESALQ). From unedited character, the main result was the direct relationship between falls and urbanized areas, which, in constant changes in land use, end up damaging the support of trees (roots), a fact explained by the high concentration of falls in the central part (36.7%), highlighted to the spring and summer seasons, i.e., winds and rains, which, together, totaling 78.0% of the total cases. The payback period expected to winds who exceeding 75 km h-1, classified as storms in the Beaufort Wind Scale, was 2.8 events per year. While there was a predominance of trade winds from the Southeast, belonging to the fourth quadrant, the direction of the gusts of wind had greater variation and, thus, with those predominant winds, it recommend installation of industrial parks in North, Northwest and West areas, since the importance of avoiding that pollutants enter into the city. The most vulnerable species were: Pachira aquatica Aubl. (Guiana Chestnut), Handroanthus sp. (Purple Ipe) and Tipuana tipu (Benth.) Kuntze (Tipuana). Through computational microclimate simulation, using the software ENVI-met version 3.1, in two case studies, being one in a residential area and another in the José Bonifácio Square, it was possible to identify locals of more attention as the falling trees, based on the local roughness, able to change the speed and direction of the wind.

A presente pesquisa trata da influência da verticalização na sensação térmica urbana, dentro de um contexto de diretrizes de compactação das cidades, aplicada à cidade de Maringá / PR, cujo clima é subtropical úmido. Pretende avaliar se o aumento do gabarito dos edifícios da região apontada, realizado de modo a respeitar o parcelamento e o uso e ocupação do solo, interfere no conforto térmico urbano, mediante a verificação do índice de temperatura fisiológica equivalente (PET). Seu desenvolvimento é realizado com base na análise de resultados obtidos por meio de ferramentas computacionais, especialmente o software ENVI-met, seguindo as seguintes etapas: 1. Histórico Urbanístico, em que se avalia o plano inicial da cidade e o seu perfil atual; 2. Caracterização Climática, na qual se elabora o arquivo climático do município, sua carta de ventos, bem como todos os tratamentos necessários para a aplicação do software; 3. Modelagem e Simulação, em que se define e constrói os cenários, para posterior simulação; 4. Avaliação Ambiental, em que se analisa a sensação térmica dos resultados da simulação. Por fim, mediante a avaliação dos resultados obtidos, demonstra-se que a verticalização, em climas subtropicais úmidos, pode ser utilizada como atenuação da sensação térmica. / This research deals with the influence of verticalization on urban thermal sensation, within a context of city compaction guidelines, applied to the city of Maringá / PR, whose climate is humid subtropical. The objective of this study is to evaluate whether the increase in the model of the buildings in the mentioned region, in order to respect the parceling and the use and occupation of the soil, interferes with the urban thermal comfort by checking the equivalent Physiological Temperature Index (PET). Its development will be carried out based on the analysis of results obtained through computational tools, especially the ENVI-met software, following the following steps: 1. Urban History, in which the initial plan of the city and its current profile will be evaluated; 2. Climatic Characterization, in which the climatic archive of the municipality, its chart of winds, as well as all the necessary treatments for the application of the software will be elaborated; 3. Modeling and Simulation, in which the scenarios will be defined and constructed, for later simulation; 4. Environmental Assessment, in which the thermal sensation of the results of the simulation will be analyzed. Finally, by means of the evaluation of the obtained results, it will be shown that the verticalization, in humid subtropical climates, can be used as attenuation of the thermal sensation.

The urban near surface atmosphere is of great concern since it affects the climate to which an increasing amount of people are immediately exposed. This study investigated the microclimate in central Stockholm in terms of the thermal conditions in the 0-2.5 m air layer and the water and heat exchange processes at different types of surfaces found within the urban environment. The main objective was to improve our understanding of the urban small-scale climate system. The urban microclimate was measured in terms of vertical air temperature profiles along a horizontal transect running through a vegetated park and its built-up surroundings during three clear and relatively calm summer days. The results showed that the air temperature at 1.2 m height within the park was 0.5 to 1.5 K lower than in the surrounding city blocks, and that the thermal stratification was generally stable (increasing temperature with height) in the park and unstable (decreasing temperature with height) in the built-up areas. In addition, there were a few examples of temperature gradients orientated in different directions within the lowest 2.5 m air layer, indicating horizontal advection between the park and the built-up areas. Climate conditions simulated with a three-dimensional microclimate model agreed well with observations and the model was therefore assumed to provide reasonable representations of important climate processes such as surface-air energy exchange processes. However, there were some discrepancies between observations and simulations that are discussed in terms of differences in real and modelled heat storage processes and wind conditions. Processes that need to be included for a more precise model description of areas such as the Stockholm environment include dynamic heat storage in buildings and dynamic wind forcing during the course of the simulation. A soil-vegetation-atmosphere transfer model was used to study soil water transport, the surface energy balance of an asphalt surface, and the impact of urban climate on evapotranspiration. Based on model calibration to field measurements of soil water content in a till catchment outside Stockholm, new parameter values were estimated that can be used for water flow modelling of till soils. The heat fluxes of an asphalt surface were reliably simulated without knowledge of site-specific calibration and the model was useful in identifying problems with energy balance closure based on measurements only. Simulations of ‘urban’ modifications to the forcing climate conditions demonstrated that increased air temperature, and thereby increased vapour pressure deficit, had most effect on evapotranspiration from tall vegetation, while increased long-wave radiation raised grass evapotranspiration the most. / QC 20100901

Submitted by WILTON DIAS DA SILVA null (wilton_ds@hotmail.com) on 2016-04-14T21:38:11Z No. of bitstreams: 1 Arborização de vias urbanas_potencial de sobreamento das espécies.pdf: 4722505 bytes, checksum: 75274908a80326de917b8364e0f7f834 (MD5) / Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-04-18T17:37:12Z (GMT) No. of bitstreams: 1 silva_wd_me_bauru.pdf: 4722505 bytes, checksum: 75274908a80326de917b8364e0f7f834 (MD5) / Made available in DSpace on 2016-04-18T17:37:12Z (GMT). No. of bitstreams: 1 silva_wd_me_bauru.pdf: 4722505 bytes, checksum: 75274908a80326de917b8364e0f7f834 (MD5) Previous issue date: 2016-02-19 / A arborização de vias urbanas pode se constituir num elemento bastante eficaz na amenização de altas temperaturas na camada intraurbana, através de mecanismos de sombreamento e evapotranspiração. Entretanto, entre os variados tipos de espécies arbóreas, quais seriam as mais indicadas para utilização na arborização das vias, a fim de mitigar a temperatura do ar no ambiente urbano? A utilização de ferramentas computacionais é uma alternativa para análise desta questão, tendo em vista que, o uso destes programas auxilia as pesquisas na área de planejamento e avaliação do ambiente construído, por meio da simulação de variados cenários. Um programa bastante utilizado para estudos de interação entre a vegetação e microclimas urbanos é o ENVI-Met, o qual, no entanto, não contém em seu banco de dados, parâmetros relativos a espécies brasileiras, em particular as de cerrado, o que pode gerar cenários microclimáticos incorretos. O objetivo desta pesquisa é propor um método para avaliação do potencial de sombreamento de espécies usadas em arborização de vias urbanas. Para tanto, foram realizados medições de radiação solar incidente sob copas de algumas espécies, usadas no sombreamento de vias urbanas da cidade de Bauru (SP), cujos resultados foram comparados com os parâmetros das mesmas espécies simulados pelo ENVI-Met. A partir do tratamento dos dados foi gerada uma ferramenta, através da qual é possível extrapolar os resultados para escolha de outras espécies. Assim, espera-se que este método contribua para a indicação de espécies que contenham potencial para mitigação da temperatura do ar nos ambientes construídos. / The afforestation of the urban streets can be a very effective element in the mitigation of high temperatures in urban layer through shading mechanisms and evapotranspiration. However, among the various types of tree species, which are the best indicated for use in street afforestation, to mitigate the air temperature in the urban environment? The use of computational tools would be an alternative to analyze this question, given that the use of these programs help in the research on planning and evaluation of the built environment through the simulation of various scenarios. A program widely used to study the interaction between urban vegetation and microclimates is the ENVI-Met, which, however, does not contain parameters in your database relating to brazilians species, particularly the cerrado species, which can create incorrect microclimatic scenarios. The aims of this research is to propose a method to evaluation of potencial shading of species used in afforestation of urban streets. For that, radiation measurements were performed in incident solar canopies of some species used in shading urban streets of the city of Bauru (SP), whose results were compared with the parameters of the same species simulated by ENVI-Met. From the processing, a tool was generated through which it is possible to extrapolate the results to select other species. Thus, it is expected that this method contributes to the indication of species that contain potential for mitigating the air temperature in the built environment

abstract: Rapid urbanization in Phoenix, Arizona has increased the nighttime temperature by 5°C (9 °F), and the average daily temperatures by 3.1°C (5.6 °F) (Baker et al 2002). On the macro scale, the energy balance of urban surface paving materials is the main contributor to the phenomenon of the Urban Heat Island effect (UHI). On the micro scale, it results in a negative effect on the pedestrian thermal comfort environment. In their efforts to revitalize Downtown Phoenix, pedestrian thermal comfort improvements became one of the main aims for City planners. There has been an effort in reformulating City zoning standards and building codes with the goal of developing a pedestrian friendly civic environment. Much of the literature dealing with mitigating UHI effects recommends extensive tree planting as the chief strategy for reducing the UHI and improving outdoor human thermal comfort. On the pedestrian scale, vegetation plays a significant role in modifying the microclimate by providing shade and aiding the human thermal comfort via evapotranspiration. However, while the extensive tree canopy is beneficial in providing daytime shade for pedestrians, it may reduce the pavement surfaces' sky-view factor during the night, thereby reducing the rate of nighttime radiation to the sky and trapping the heat gained within the urban materials. This study strives to extend the understanding, and optimize the recommendations for the use of landscape in the urban context of Phoenix, Arizona for effectiveness in both improving the human thermal comfort and in mitigating the urban heat island effect. / Dissertation/Thesis / Ph.D. Design 2014

A influência benéfica de áreas verdes no conforto humano em áreas urbanas tem sido reconhecida por estudos de diferentes campos do conhecimento. Áreas verdes e arborização bem planejada constituem importantes recursos para melhorar a qualidade do ambiente ao promover bem-estar físico e mental aos seus usuários. Avaliar o grau de interferência proporcionado pela arborização no conforto térmico e bem-estar da população foi o objetivo principal do presente estudo. O índice de floresta urbana (IFU) avaliou a interferência da quantidade de cobertura arbórea em quatro áreas da cidade de Campinas/SP/Brasil em relação às condições de conforto térmico. Para tanto, foram utilizados índices de avaliação de conforto térmico (PMV Predicted Mean Vote e PET- Physiologically Equivalent Temperature) obtidos por meio do modelo Ray Man Pro.Questionários aplicados aos usuários das áreas de estudo possibilitaram verificar se os resultados obtidos por meio dos índices PMV e PET correspondiam à real sensação de conforto térmico relatada pelos entrevistados.Simulações com o uso do programa ENVI-met v. 3.1 foram realizadas a fim de observar as interferências microclimáticas causadas pela inserção de vegetação no meio urbano. A percepção do usuário das áreas de estudo em relação à arborização urbana também foi identificada por meio de questionários. Essa pesquisa permitirá no futuro, a partir dos resultados levantados, construir um instrumento para ser incorporado no plano diretor de arborização urbana, possibilitando urbanistas e profissionais, que atuam de forma direta ou indireta no planejamento das cidades, inspecionar e analisar o conforto térmico e a qualidade de vida no meio urbano, tendo em vista a valorização e adequação da arborização viária em seus projetos. / The benefits of green urban area on human comfort have been recognized by studies performed in different knowledge fields. Green areas and urban forest planning are important tool to improve the quality of the urban environment by promoting physical and mental wellbeing to its users. The main goal of the present study is to assess the interference promoted by green areas in the welfare and thermal comfort of the urban population. The Urban Forest Index (IFU) evaluated the interference of the amount of trees in four areas of the city of Campinas, in the state of São Paulo, Brazil in relation to the conditions for thermal comfort. For this purpose, comfort indices have been used for evaluating thermal comfort (PMV-Predicted Mean Vote and PET-Physiologically Equivalent Temperature), obtained by the RayMan model. Questionnaires applied to the users on these study areas aimed to verify if the results of PET and PMV indices corresponded to the thermal sensation by respondents. Simulations using the ENVI-met program v 3.1 were conducted to observe the interference on microclimate due to the presence of vegetation in the urban environment. Questionnaires were also used to assess the perception of users on urban street trees. In the future, results obtained in this study will allow the building of an instrument, which could be included in the urban forest master plan. As a result, urban planners and other professionals who work directly or indirectly in the planning of cities will be able to inspect and evaluate the thermal comfort and the welfare of their citizens, considering the recovery and suitability of urban street trees in their projects.

A influência benéfica de áreas verdes no conforto humano em áreas urbanas tem sido reconhecida por estudos de diferentes campos do conhecimento. Áreas verdes e arborização bem planejada constituem importantes recursos para melhorar a qualidade do ambiente ao promover bem-estar físico e mental aos seus usuários. Avaliar o grau de interferência proporcionado pela arborização no conforto térmico e bem-estar da população foi o objetivo principal do presente estudo. O índice de floresta urbana (IFU) avaliou a interferência da quantidade de cobertura arbórea em quatro áreas da cidade de Campinas/SP/Brasil em relação às condições de conforto térmico. Para tanto, foram utilizados índices de avaliação de conforto térmico (PMV Predicted Mean Vote e PET- Physiologically Equivalent Temperature) obtidos por meio do modelo Ray Man Pro.Questionários aplicados aos usuários das áreas de estudo possibilitaram verificar se os resultados obtidos por meio dos índices PMV e PET correspondiam à real sensação de conforto térmico relatada pelos entrevistados.Simulações com o uso do programa ENVI-met v. 3.1 foram realizadas a fim de observar as interferências microclimáticas causadas pela inserção de vegetação no meio urbano. A percepção do usuário das áreas de estudo em relação à arborização urbana também foi identificada por meio de questionários. Essa pesquisa permitirá no futuro, a partir dos resultados levantados, construir um instrumento para ser incorporado no plano diretor de arborização urbana, possibilitando urbanistas e profissionais, que atuam de forma direta ou indireta no planejamento das cidades, inspecionar e analisar o conforto térmico e a qualidade de vida no meio urbano, tendo em vista a valorização e adequação da arborização viária em seus projetos. / The benefits of green urban area on human comfort have been recognized by studies performed in different knowledge fields. Green areas and urban forest planning are important tool to improve the quality of the urban environment by promoting physical and mental wellbeing to its users. The main goal of the present study is to assess the interference promoted by green areas in the welfare and thermal comfort of the urban population. The Urban Forest Index (IFU) evaluated the interference of the amount of trees in four areas of the city of Campinas, in the state of São Paulo, Brazil in relation to the conditions for thermal comfort. For this purpose, comfort indices have been used for evaluating thermal comfort (PMV-Predicted Mean Vote and PET-Physiologically Equivalent Temperature), obtained by the RayMan model. Questionnaires applied to the users on these study areas aimed to verify if the results of PET and PMV indices corresponded to the thermal sensation by respondents. Simulations using the ENVI-met program v 3.1 were conducted to observe the interference on microclimate due to the presence of vegetation in the urban environment. Questionnaires were also used to assess the perception of users on urban street trees. In the future, results obtained in this study will allow the building of an instrument, which could be included in the urban forest master plan. As a result, urban planners and other professionals who work directly or indirectly in the planning of cities will be able to inspect and evaluate the thermal comfort and the welfare of their citizens, considering the recovery and suitability of urban street trees in their projects.

Submitted by SBI Biblioteca Digital (sbi.bibliotecadigital@puc-campinas.edu.br) on 2017-03-23T13:25:54Z No. of bitstreams: 1 L?GIA PARREIRA MUNIZ G?AL.pdf: 5270981 bytes, checksum: 96b0646b01e474b8307ad43548bce884 (MD5) / Made available in DSpace on 2017-03-23T13:25:54Z (GMT). No. of bitstreams: 1 L?GIA PARREIRA MUNIZ G?AL.pdf: 5270981 bytes, checksum: 96b0646b01e474b8307ad43548bce884 (MD5) Previous issue date: 2017-02-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The formation of cities has shaped the urban street canyons, defined by the street and the buildings that extend along its sides. The land use and occupation are agents that modify the climate, however this is rarely considered in the urban planning of cities. Aspects like height and width ratio, sky view factor, albedo of the surface materials and the presence of vegetation in the canyon have been widely studied in association with the local climatic behavior. Understanding the influence of these parameters on the microclimate of urban street canyons is indispensable to achieve sustainability between urban occupation and thermal comfort. Therefore, the objective of this thesis is to investigate the interference of land use and occupation legislation and urban geometry in the microclimate of an urban street canyon in Campinas/ SP. The methodology used involves the climatic monitoring of the study area in Cambu? (neighborhood), the urban and climatic characterization of three points with different land use and occupation configurations and the selection of the canyon used for simulation scenarios. These scenarios involve two main aspects: the local urban legislation and the canyon geometry (height width ratio - H/W and length height ratio - L/H). The simulations were performed using the microclimatic simulation model ENVI-met 4.0 preview. Scenarios in agreement with the local legislation showed that, in winter, only 25% of day perceived discomfort to heat. In the other hand, in the summer period, a comfortable feeling was perceived in only 25% of the day, providing discomfort to the heat for the rest of the day. In the scenarios varying the urban geometry it was verified that, for scenarios with the same H/W ratio, the PET (Physiological Equivalent Temperature) value did not suffer significant alteration. However, when the L/H ratio was fixed and the H/W ratio varied, we noted that deeper canyons led to lower PET peaks. The scenario A, for example, with a lower H/W ratio (0.5) and lower L/H (3) ratio, showed PET peak 7.3?C higher than the scenario I with a higher H/W ratio (2.0) and higher L/H ratio (7). The results showed that there is a strong correlation between the H/W ratio and the thermal comfort of the urban street canyons: deeper canyons yield lower PET values. Moreover, it was verified that the climatic conditions of the canyon are independent of their length (L/H ratio) and that canyons oriented in the prevailing wind direction (SE) reached lower PET values. Finally, it was evidenced that shading and wind speed are fundamental in determining comfort in urban street canyons. / A forma??o das cidades tem configurado os chamados c?nions urbanos, definidos pela interface composta pela via e as edifica??es que se estendem em suas laterais. O uso e ocupa??o do solo s?o agentes modificadores do clima e, no entanto, este ?ltimo tem sido pouco levado em considera??o no planejamento urbano dos munic?pios. Entretanto, aspectos como a rela??o altura e largura do c?nion, o fator de vis?o do c?u, o albedo dos materiais de superf?cie e a presen?a de vegeta??o no c?nion t?m sido amplamente estudados em associa??o com o comportamento clim?tico local. Neste contexto, entender a influ?ncia desses par?metros no microclima de c?nions urbanos ? de fundamental import?ncia para se atingir a sustentabilidade entre ocupa??o urbana e conforto t?rmico. Em vista disso, o objetivo deste trabalho ? analisar a interfer?ncia da legisla??o de uso e ocupa??o do solo e da geometria urbana no microclima de um c?nion urbano da cidade de Campinas/ SP. Para isso foi utilizada uma metodologia que envolve o monitoramento clim?tico do recorte de estudo selecionado no bairro Cambu?, a caracteriza??o urbana e clim?tica de tr?s pontos com diferentes configura??es de uso e ocupa??o do solo e a escolha do c?nion de interesse para simula??o de cen?rios que envolvem dois aspectos principais: a legisla??o urban?stica local e a geometria do c?nion (rela??o altura largura ? H/W e rela??o comprimento altura ? L/H). As simula??es foram realizadas com o modelo de simula??o microclim?tica ENVI-met 4.0 preview. Nos cen?rios respeitando a legisla??o o desconforto para o calor foi observado em apenas 25% do dia no per?odo de inverno; j? no per?odo de ver?o a sensa??o de conforto foi obtida em apenas 25% do dia, sendo observado desconforto para o calor no restante do dia. Nos cen?rios variando a geometria urbana verificou-se que, para cen?rios de mesma rela??o H/W, o valor do PET (Physiological Equivalent Temperature) n?o sofreu altera??o significativa. J? quando se fixou a rela??o L/H e variou-se a rela??o H/W, ficou claro que c?nions mais profundos levaram a picos de PET mais baixos. O cen?rio A, por exemplo, de menor rela??o H/W (0,5) e menor rela??o L/H (3), apresentou pico de PET 7,3?C mais alto que o cen?rio I, de maior rela??o H/W (2,0) e maior rela??o L/H (7). Os resultados mostraram que existe forte correla??o entre a rela??o H/W e o conforto t?rmico dos c?nions urbanos: quanto mais profundo, menores os valores de pico do ?ndice PET. Al?m disso, verificou-se que c?nions orientados na dire??o predominante dos ventos alcan?aram valores de PET mais baixos. Por fim, foi evidenciado que o sombreamento da superf?cie e a intensidade da velocidade do vento s?o fundamentais na determina??o do conforto t?rmico em c?nions urbanos.

De nombreuses études au cours des dernières décennies ont porté sur l'effet l’îlot de chaleur urbain (ICU). Les efforts initiaux visant à comprendre les facteurs qui influent sur l’ICU ont contribué à la mise en place de solutions et de stratégies d'atténuation adaptées. Les stratégies d'atténuation comprennent généralement l'augmentation de l'albédo urbain (réflectivité au rayonnement solaire) et l'évapotranspiration. Les augmentations d'albedo sont obtenues grâce à des technologies de toiture et de pavage ayant un albédo élevé. Une augmentation de l'évapotranspiration est obtenue par une combinaison de la diminution de la fraction de surfaces imperméables et la plantation de végétation dans les zones urbaines. Le confort thermique extérieur est défini à partir d’indices prenant en compte différents paramètres physiques et traduit la perception et la satisfaction des piétons. Ce confort est très difficile à obtenir en climat chaud et aride. Par conséquent, le travail présenté dans ce document met l'accent sur les méthodes appropriées pour réduire l’ICU et ainsi améliorer le confort thermique en plein air des piétons. Jusqu’à présent, peu de recherches ont été menées sur le confort thermique extérieur dans un climat chaud et aride. Les études sur l'atténuation de l'ICU et le confort thermique extérieur sont pratiquement inexistantes pour la ville de Bagdad. Bagdad a un tissu urbain complexe avec des constructions modernes, des maisons traditionnelles et des éléments caractéristiques du patrimoine local. Le climat en été est chaud, et les mois d'été sont considérés comme la plus longue saison avec près de 7 mois de l'année. Dans un premier temps, cette étude se concentre sur l'étude des stratégies d'atténuation à envisager afin d’évaluer comment le confort des piétons est affecté par les choix de conception des constructions, en comparant un quartier traditionnel à un quartier moderne. L’étude envisage ensuite la façon dont la végétation et les ombrages contribuent à réduire l'effet de l'ICU et à améliorer le confort thermique extérieur. Quatre scénarios différents sont élaborés pour évaluer le rôle d’éléments végétaux tels que les arbres, l'herbe et les différents modèles d'ombrage. L'évaluation a été effectuée le jour le plus chaud de l'été, la température radiante moyenne, l'humidité spécifique, la température de l'air et les distributions de la vitesse du vent ont été analysées à l'aide du logiciel ENVI-met. Le confort thermique est ensuite évalué à l'aide des indices thermiques de la température équivalente physiologique PET et du PMV étendu aux ambiances extérieures. En outre, une proposition de solution est abordée afin d’étudier son impact sur le confort thermique pour la journée la plus chaude (situation extrême) et une journée typique d’été. Les résultats ont révélé une amélioration du confort thermique dans la journée typique d’été. L'étude montre comment les facteurs urbains tels que le rapport d'aspect, la couverture végétale, les ombres et la géométrie du quartier sont des éléments cruciaux que les urbanistes et les municipalités doivent prendre en compte, en particulier pour les nouveaux aménagements urbains dans un climat chaud et aride. Une proposition d’aménagement global pour atténuer les ICU dans le cas d’un nouveau quartier sous climat aride, est détaillée en fin de mémoire. / Numerous studies over the past several decades focused on the effect of the Urban Heat Island. Initial efforts on understanding the factors affecting UHI contributed to proceed the appropriate solutions and mitigation strategies. Mitigation strategies comprise increase both urban albedo (reflectivity to solar radiation), and evapotranspiration. Albedo increases are obtained through high albedo roofing and paving technologies. An increase in evapotranspiration is achieved through a combination of decreasing the fraction of impervious surfaces and planting vegetation in urban areas. The outdoor thermal comfort is influenced by the perception and satisfaction of the pedestrians, especially in hot and arid climates. Consequently, this work focuses on the appropriate methods for reducing the Urban Heat Island and thus to enhance the pedestrians outdoor thermal comfort. However, there is limited research conducted on the outdoor thermal comfort in hot and arid climate. The studies on the mitigation the Urban Heat Island and the outdoor thermal comfort are almost non-existent for Baghdad city. Baghdad has a complex urban fabric with modern design constructions buildings, traditional and heritage houses. The climate in summer is hot, and summer months are considered the longest season with nearly 7 months of the year. This study focuses on investigating possible mitigation strategies to ensure how pedestrian comfort is affected by the constructions design choices comparing a traditional district to a modern one, and on how vegetation and shading patterns contribute to reducing the effect of UHI and improving the outdoor thermal comfort. Four different scenarios are designed to assess the role of vegetation elements such as trees, grass, and different shading patterns. The evaluation was performed on the hottest day in summer, the mean radiant temperature, specific humidity, air temperature, and wind speed distributions have been analyzed using ENVI-met software. Thermal comfort is assessed using the thermal indices the Physiological Equivalent Temperature PET and the Predicted Mean Vote PMV. Also, a proposal model is designed to evaluate the thermal comfort on the hottest day and the typical day in summer. The results revealed an improvement on thermal comfort in the typical day in summer. The study shows how the urban factors such as the aspect ratio, vegetation cover, shadings, and geometry of the canyon are crucial elements that urban planners and municipalities have to take into account, especially for new urban developments in hot, arid climate.