WASHINGTON SILVA ALVES
Abstract:
The Iporá city is located in the mesorregion of Goiás west, in the state of Goiás, 220km from the capital, Goiânia. It has a population, according to IBGE (2010), of 31,274 inhabitants; Of these, 28,545 live in the urban area, distributed in 66 neighborhoods, and 2,729 in the rural area. The aim of this research was to analyze the variation of temperature and relative humidity, maximum and minimum absolute, in a small city of the Brazilian Cerrado, identifying the relationships with the physical aspects of the environment, function and urban morphology. Temperature and relative humidity data were collected from October 2012 to October 2013, with thermohygrometers (model HT-500) and automatic weather stations, distributed in five points in the urban area and one in the rural area. The points of the urban area were differentiated in terms of construction density, vegetation, hypsometry, slope exposure and land use and occupation. For the analysis of climatic factors - temperature and relative humidity - the local scale proposed by Andrade (2005) was used, which defined it as climate of an area with a characteristic combination of elements, which may correspond to a type of land occupation. (neighborhood, urban park), be the specific topographic conditions (valleys, hill, etc.). The methodology was based on the urban climate system of Monteiro (1976), with emphasis on the thermodynamic subsystem that addresses the behavior of temperature and relative humidity in urban environments. ArcGis 9.0, Spring 5.2 and Surfer 9.0 software were used for cartographic surveys and for spatialization of temperature and humidity values. It was found that the absolute maximum temperature value (46.2 ° C) was recorded in P2, in October 2012, at 2:30pm and the absolute minimum occurred in P1 (8.3 ° C), in July 2013, at 7am The absolute maximum relative humidity occurred in P2 (99%) in January 2013, and the absolute minimum humidity in P2 (8%) in September 2013. Linear regression was used to determine the coefficient of humidity correlation (r) and determination (R²) by means of electronic spreadsheets. The results revealed that the exposure of the slopes, the vegetation density, construction, the hypsometry, and the patterns of use and occupation of the soil influenced the registration and variation of the maximum and minimum absolute values of temperature and relative humidity in Iporá.
