Research On The Formation Mechanism Of Chongqing City Thermal Environment

As the society continuously developing the process of urbanization is becomingmore and more quickly, especially chongqing, urbanization has obtained theremarkable achievements since it became the municipality directly under the centralgovernment. Originally is given priority to with natural vegetation land graduallyreplaced by large Numbers of city buildings, urban roads are mostly built impermeablematerial, such as use cement, asphalt, the changes caused the most direct negativeinfluence on the urban thermal environment change. Greatly increase the scale andintensity of urban heat island effect, seriously restrict the development of the city, andmake the residents living environment worsening. The increasing deterioration of theurban thermal environment has become one of the important factors that affect socialand economic sustainable development.This paper taking chongqing as the research object, based on1993,1997,2000and2006four periods’ remote sensing image, using remote sensing, geographic informationtechnology and neural network classification method to extract various kinds of landuse/cover type, using the ArcGIS information statistics, from all kinds of land use/covertype area size and single land use/cover type area size two sides, monitoring the changeof land use/cover type area size. Through mono-window algorithm getting the surfacebright temperature information, and monitoring the change of thermal environmentfrom the spatial pattern of thermal field in the study area and temporal and spatialevolution law two sides. For the formation of the thermal environment analysis in thestudy area, has the following conclusion:(1) the development of the city to change the nature of the original structure ofunderlying surface, mostly replaced by thermal inertia is larger in the materials,enhanced the thermal radiation absorption capacity of the whole city, causes the urbantemperature heating block cooling slowly, make the whole city temperatureenvironment in high temperature condition.(2) urban water cycle of destruction, urban underlying surface evaporation cannotstore enough water supply for cooling, makes the city temperature is high.(3) the construction of city is not based on scientific planning, makes the expansionof the city presents blindness, this will cause urban built up area of the air circulation is hampered by serious, heat in the city can not be timely spread throughout the city.