Study On Evaluation Method Of Urban Heat Island Effect

With the progress of human society and the city ’s rapid economic development，the cityis also accompanied with these problems that the population is more concentrated，industrial energy consumption is growing，urban surface gradually being replaced by agreen cement，asphalt，concrete and other conditions by the same time. Rapid urbandevelopment in the emotion aside，we also have to face new environmental problems-urban heat island effect. With continued global warming，air pollution，acid rain，and sothe world environmental problems，urban heat island effect on human health more andmore serious.This study of the heat island problem analysis and research，to find theevaluation method suitable for the urban heat island effect，in order to effectivelyanalyze the causes of urban heat island characteristics，trends，identification of urbanheat island intensity to provide the basis to find the mitigation of urban heatenvironment deteriorating ways to achieve harmonious development between man andnature，has a certain practical significance.Firstly，through a literature review to clarify the formation of urban heat island effectfour factors：①the change of urban surface thermal properties；②anthropogenic heat，air pollution and greenhouse gases；③city size，population increase；④weathersituation and weather condition and other factors. Also from the weather，energy，biotechnology，health and other aspects of the residents to explain the dangers of theheat island effect，and on the basis for the above factors，we propose an effectivestrategy to mitigate the heat island intensity.Second to previous studies based on actual research，the proposed objectives andprinciples of the urban heat island evaluation methods；through AHP established fourcriteria evaluation system layers and layers of eight indicators；determined after acomprehensive expert scoring index weights and build the urban heat island effectevaluation method based on fuzzy comprehensive evaluation method.Finally，the evaluation method，respectively Shanghai，Chongqing，Wuhan，Kunming’s urban heat island effect was evaluated，the results show four cities：from06to12years，Shanghai’s urban heat island has gradually rising trend；while three cities in theinland，urban heat island effect comprehensive evaluation rating of Chongqing is classV (bias in grade IV) and strongest，which is closely related to the large populationdensity of Chongqing；Secondly，the evaluation results of Wuhan is V level，the strong performance of the heat island effect；Kunming has weakest heat island effect in thethree cities and the evaluation class is II，the heat island effect in performance is veryweak. According to survey results，the evaluation results with the actual match. Then，based on the evaluation results the study put forward corresponding countermeasures tomitigate each city’s heat island effect.Visible，this evaluation method has betterscientific and practical.Through the establishment of urban heat island effect evaluation methods，researchusing analytic hierarchy process and expert scoring method to determine the weights ofevaluation and the use of fuzzy comprehensive evaluation method heat island city’s heatisland mitigation and governance guiding role and significance.