Study On The Effect Of Surface Drought On Urban Surface Heat Island In Poyang Lake Area

This study is focused on drought and urbanization in Poyang Lake Area,south of China.Ten Landsat5 TM and Lansat8 OLI/TIRS remote sensing images acquired between 1995 and 2016 are used.The temperature/vegetation index(TVDI)and the normalized Surface Urban Heat Island(SUHI)intensity are used to monitor the drought and urban heat island conditions respectively.And then,spatial statistical analysis and correlation analysis methods are used to explore the influence of surface drought on urban heat island in the study area.Results show that:(1)TVDI has obvious indication in the land use types of dry land and bare land area.The greater mean TVDI value of bare and dry land is,the higher degree of drought is.(2)The SUHI intensity is changed with the seasonal variations,the SUHI intensity are stronger in summer and autumn,and weaker in winter.Besides,the SUHI of Jingdezhen is stronger than other districts and counties.(3)The normalized SUHI intensity in the study area appears no obvious change as the urban area expanded.Furthermore,urban area has no significant impact on the normalized SUHI intensity.(4)In addition,the surface drought has significant positive correlation with the SUHI intensity.The more drought the land surface is,the stronger the SUHI intensity becomes.