| 郑州城市形态对热岛强度影响的城市发展梯度差异 |
| 摘要点击 967 全文点击 205 投稿时间：2024-03-04 修订日期：2024-05-16 |
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| 中文关键词 热岛强度 城市形态 城市发展梯度 GBRT-DEMATEL-ISM组合方法 郑州 |
| 英文关键词 heat island intensity urban form urban development gradients GBRT-DEMATEL-ISM combination method Zhengzhou |
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| 中文摘要 |
| 城市形态对热岛强度的影响机制是研究关注的核心议题,已有成果多集中于城市形态与热环境的关联规律,对城市发展梯度沿线的差异研究较少,梯度差异下边际效应和优化路径的研究相对匮乏. 以郑州市中心城区为例,基于Landsat遥感影像和NPP-VIIRS卫星夜光遥感影像等多源数据,引入梯度提升回归树模型对DEMATEL-ISM方法进行改进,探究城市形态对热岛强度影响的梯度差异及边际效应. 结果表明：①2006~2020年间,热岛强度均随城市发展强度的增加而增加,增加趋势逐年放缓；②城市形态影响热岛强度的梯度差异明显,绿地形态指标始终对热岛强度有较强影响,NDVI是各梯度内影响最显著的变量,建设用地格局指标的影响强度随梯度增加而显著提升,建筑组合形态指标的作用则随之减弱；③根据ISM模型得到城市形态指标影响热岛强度的四层三阶结构模型,高强度建设梯度内建设用地格局指标为根源致因阶,低强度建设梯度内建筑组合形态指标为根源致因阶. ④城市形态边际效应的梯度差异明显,随着指标取值的增加,其影响强度与影响方向会发生变化,不同梯度内影响热岛强度的关键指标及其阈值范围都存在差异. 提出城市发展梯度差异下,基于城市热环境改善的城市形态边际优化方法,可为城市有序扩张和城乡协调发展提供精细化的实践参考. |
| 英文摘要 |
| The impact mechanism of urban form on heat island intensity （HI） is a core issue of research attention. Existing achievements have mostly focused on the correlation between urban form and thermal environment. Research on the differences along urban development gradients, and research on marginal effects and optimization paths under gradient differences is relatively scarce. This study considered the central urban area of Zhengzhou as an example, based on multi-source data such as Landsat remote sensing images and NPP-VIIRS satellite night light remote sensing images, and introduced a gradient-enhanced regression tree model to improve the DEMATEL-ISM method, exploring the gradient differences and marginal effects of urban morphology on heat island intensity. The results showed that： ① From 2006 to 2020, the HI decreased with the increase in urban development gradient, and the increasing trend slowed down annually. ② The gradient difference between urban form and HI was significant. The green space form index always had a strong impact on HI, among which, NDVI was the most significant variable within each gradient, and the impact intensity of the construction land pattern index increased significantly with the increase in gradient, whereas the role of building combination form index weakened accordingly. ③ According to the ISM model, a four story-three order structural model of urban form indicators was obtained. The construction land pattern indicator within the high intensity construction gradient was the root cause order, and the building combination form indicator within the low intensity construction gradient was the root cause order. ④ The differences in the marginal effect of urban form along the gradient were significant. As the value of the indicator increased, its impact intensity and direction would change. There were differences in the key indicators and threshold ranges that affected the intensity of HI within different gradients. The study proposes a marginal optimization method for urban form based on the improvement of the urban thermal environment under the differences along urban development gradients, providing refined practical reference for orderly urban expansion and coordinated urban-rural development. |
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