Spatial-temporal Pattern of Thermal Environment and Cooling Effect of Parks in Summer of Xi'an
LI Yao
PAN Jinghu
Abstract：Based on the remote sensing image data of Landsat TM/OLI/TIRS,this paper studied the spatial-temporal pattern and dynamic characteristics of heat island landscape in Xi'an central urban area from 1988 to 2014,by using mono-window algorithm and split window algorithm.Object-oriented fractal net evolution approach is employed to extract the range of urban heat island.The spectral unmxing model is adopted to disclose the different underlying surface components of Xi'an.The relationship between different underlying surface factors and the urban land surface temperature is explored.Ten parks are selected as typical examples to illuminate the relationship between the internal surface temperature and characteristics of patches in those parks as well as the cooling range of those parks.Results indicate that in 1988-2006,the proportion of areas in high and relatively high temperature in Xi'an central urban area rises while in 2006-2014 the proportion of areas in high and the highest temperature goes down.During 26 years,the area of heat island regions increases,while the area of cold island regions reduces.The absolute value of area change is:cold island area ＞ the middle zone＞ secondary heat island ＞ secondary cold island ＞ heat island.The vegetation coverage of Xi'an central urban area is logarithmically negatively related with the surface temperature,while the impervious surface and the surface temperature positively logarithmically correlate with each other.The internal temperature of a park has a significantly negative correlation with the perimeter and the area of the park,and a significantly positive correlation with the perimeter-to-area ratio.The park average temperature reducer range has a strong positive correlation between the park area and shape index of park.The extent of reducer average remperature showed a lower level of positive correlation between the water area and shape index.
Keywords：urban heat islandheat island effectthermal landscape patternXi'an
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 15-26 )