Study On The Heat Island Effect And Spatial-Temporal Distribution Patterns In Island

With the rapid development of urbanization in the land area,most people have focused their attention on the large islands near the continental shelf,which has led to a significant increase in the speed of urbanization in the island area in recent years.During the development process,most cities blindly pursued rapid development and the built-up area is constructed and expanded blindly,occupying the cultivated land and forest land to turn it into an urban built-up area.Such blind development is the unreasonable spatial pattern of urban land use,which has brought many environmental problems and caused a certain negative impact on the ecological environment of the island.Because there is a certain difference between the ecological environment of the island and the mainland,its own regulation and external ecological governance are also different,which makes it difficult to deal with the ecological environment of the island area,causing a series of new ecological problems.One of the more common and intractable environmental problems is the urban heat island effect.The urban heat island effect is caused by the large amount of heat and greenhouse gases emitted by human production and life in the internal space of the city that cannot be quickly released,resulting in the temperature of the area with the heat The accumulation increases,and in comparison with the suburbs,the temperature is significantly higher than the suburbs,thus forming a city-centric heat island.The heat island effect causes the temperature in the city to rise gradually,which seriously affects the production and life of the residents in the city and also has a certain impact on the health of the residents in the area.In this paper,through the research and analysis of the heat island effect of Zhoushan Island,the spatial and temporal distribution pattern of the heat island effect in the island area is explored,and corresponding countermeasures are proposed to deal with the urban heat island effect,to better plan the spatial structure of land comprehensive utilization,optimize the spatial pattern of land comprehensive utilization,and weaken the city The heat island effect and mitigating its impact on the entire city.This article takes the island area of Zhoushan City,Zhejiang Province,China as a comprehensive analysis and research object.Based on remote sensing and geographic information system technology,it selects two images from each cycle within a five-year period from 1998 to 2017,a total of ten After processing the image,the surface temperature can be retrieved.Combined with the statistical analysis method to analyze the inversion results,the characteristics of Zhoushan Island's urban heat island effect with time were studied,and the land use pattern of Zhoushan Island was obtained through remote sensing classification.It shows the changes in the city of Zhoushan main island,combined with the distribution of the heat island effect,we can study the characteristics of the spatial change of the city's heat island effect in Zhoushan.Then through the research on the influencing factors of the urban heat island effect of the image through the generalized additive model,these influencing factors are sorted and analyzed,and the influencing effect of the urban heat island effect is obtained.Through the above research work,this paper draws the following results:(1)Under the time span,according to the time span of different seasons in the same year,it can be concluded that the urban heat island effect in winter is the strongest in a year,followed by summer,and the urban heat island effect in spring and autumn is the weakest;but the same season is different The comparison under the year shows that the heat island effect in summer is increasing year by year and then decreasing year by year,the weakest in 1998 and 2017,and the strongest in 2007.The heat island effect in winter is divided into winter in December and winter in February In December,the heat island effect will be stronger than the heat island effect in February,but there is a big difference in the distribution of urban heat island effect between the two times.(2)Under the spatial span,the general trend of the urban heat island effect with spatial changes is that when the city expands,the heat island area will also expand with the expansion of the city,and the city has developed from the original three-city gathering area to 20 years.In the later four-city gathering area,the urban heat island effect has become stronger with time.The non-urban construction land within the city,inland mountainous areas,cultivated land,forest land,grassland,bare land,water bodies and other areas covered by other types of objects all have obvious urban heat island effect.However,the non-urban construction land and water in the area are developing into urban construction land year by year.The reduction of other types of land has a certain impact on the intensification of the urban heat island effect.(3)Throughout summer and winter,the influencing factors of the island city heat island effect in long time series include the distance to the district and county center,the normalized building index,the normalized vegetation index,and the distance to the coastline.However,these factors are essentially caused by the blind construction of urban built-up areas and the excessive transformation of natural vegetation and underlying surfaces caused by the rapid development of the city.The acceleration of the urbanization process is beneficial to economic development and urban development in the short term.Yes,but it has had a serious impact on the ecological environment of the city for a long time,especially in island cities,which are different from inland city ecosystems.The ecological environment of the island is more difficult to repair than inland regions.The harm is irreversible in the short term,so reasonable urban development is an effective measure to reduce the heat island effect of island cities.