Mitigation ability of urban water patches to heat island effect—Taking Shenyang City as an example
Water bodies regulate the environment.In urban ecosystems,they effectively alleviate the heat island effect by cooling the surrounding surfaces.This study used Landsat imagery to analyze the evolution of the urban heat island effect in Shenyang City from 2000 to 2020.We constructed buffer zones around water body patches for analysis.Three indicators—cooling range,cooling magnitude and cooling gradient—were used to quantify the mitigation ability of water body patches on the urban heat island effect.We quantitatively analyzed the factors influencing the mitigation capacity of water body patches,including area,shape index,and the pro-portion of the surrounding built-up area.The study results are as follows:①The urban heat island distribution in Shenyang City expanded from the central urban area to the suburbs from 2000 to 2020,with the heat island area increasing by approximately 40%;②The average cooling distance of water body patches on the surround-ing built-up areas is 0.27 km,with an average temperature reduction of 2.26℃in adjacent built-up areas,and an average ground temperature drop of 8.28℃per 1 km distance from the water body patch boundary;③In-creasing the water body area significantly enhances the cooling range and cooling magnitude,and the increase in the shape index also enhances the cooling effect,while the increase in the proportion of built-up areas around water bodies inhibites the cooling range and cooling magnitude.The cooling gradient of water body patches is significantly negatively correlated with the proportion of the built-up area around them and is not significantly re-lated to the area and shape index.
water body patchheat-island effectmitigation abilitycooling effecturban ground temperatureen-vironmental remote sensing
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