Study On The Relationship Between Water - Impermeable Surface Change And Urban Heat Island Effect In Dianchi Lake Basin Based On Landsat Image

Accelerating process of urbanization has prompted a rapid increase inimpervious surfaces area, the change has led to a huge impact on climate in cities, inwhich the most significant is the emergence of urban heat island effect. Kunming isoften regarded as the main study area in Dianchi Lake Basin. Under the backgroundof industrial structure changing and optimizing the distribution of resources, theKunming city has achieved a rapid economic development and accompaniedaccelerating urbanization, people’s living standards promotion, urban spaceexpanding. The factors above all causes a continual of impervious surface area.Increasingly intense urbanization has led to the improvement of surface temperature,and strongly influences ecosystems, energy flow of Kunming, changes the urbanecological structure and function, affects the health of urban residents. Impervioussurface changes plays an important role in city’s climate change, the most significantimpact is emergence of urban heat island. UHI (Urban Heat Island) is the product ofurbanization, which is referring to the phenomenon of temperature significantlyhigher than the city’s outlying suburbs.Based on the RS and GIS technology, the article research the distributionpattern of impervious surface and urban heat island within the range of Dianchi LakeBasin, and explore the relationship between impervious surface changing and urbanheat island effect. The studies have shown that the presence of impervious surfacesin some areas led to a significantly higher temperature. Through comparing theextracted data validate that the distribution and changes of urban heat island are clearconsistency with impervious surface. However, the lush vegetation coverage areaand water turn into "cold island " area in city. In this paper, it takes nearly threedecades of image data (Landsat5, Landsat7, Landsat8) to extract impervious surfacesinformation in Dianchi Lake basin. Through combining with the construction ofbuilt-up areas and environmental situation within the scope of Dianchi Lake basin, itfinally accomplishes the surface temperature inversion, and explores the relationshipbetween the development of impervious surfaces and surface the temperature change, which expects to provide basis for decision making and better support the economicdevelopment and coordinated development of urban construction and environmentwithin the Dianchi Lake Basin.