The Role of physical development of urban heat island phenomenon (The neighborhood down the street in Mashhad)

With the urbanization of cities in the urban natural characteristics and physical development were altered and Earth has been affected by various issues and largely lost its natural state One of the consequences of temperature increase With the expansion of the city and the city after the 1930s, especially after the Second World War, local weather changes were observed in urban. In all metropolises of the world, including Mashhad, due to removing vegetation and plants and replacing them with dark materials for construction and consumption of fossil fuels, this heat is dangerous and causes heat island have increased. In fact, the emerging environmental risk, which is due to urban expansion, comes from a high percentage of natural surface coatings destroyed and replaced by buildings, roads and other municipal utilities that. The risk factor is something that has harmful effects on the environment and human health and are now increasing temperature and thermal inversion that the effects of this phenomenon, especially in the area around the shrine in Mashhad, there is a main way these effects, undermine local air flow, which means better natural ventilation system in that it impairs the durability of air pollution is produced. The lack of vegetation lost due to the heat of evaporation and transpiration decreases and plant levels can have a key role in regulating surface temperature and in physical development tissue surrounding the shrine in Mashhad, this role has been ignored.This study aims to general familiarity with the context of research, to study the role of physical development of urban heat island and achieve a comment on this phenomenon. Weather conditions in different parts of a city can be significantly different than PARALLEL in the same city. The reasons for this difference can be several factors such as the geometry of the adjacent buildings, urban morphology, vegetation, height and sex roofs and walls, the air circulation flow between buildings, etc. We also saw the difference in temperature at various locations in the city of Mashhad and its purpose is to review and analyze the factors in the neighborhood.

Keywords:

physical development , heat island , natural ventilation , microclimate , Mashhad