海口市滨水绿地空间对城市热缓解的响应

Response of Haikou Waterfront Green Space to Urban Heat Mitigation

摘要:

气候变暖导致各类缓发性不利影响不断加剧，适应气候变化，优化绿地系统空间布局，是缓解城市热岛效应的关键方法。采用Landsat8 遥感影像反演出地表温度作为量化数据源，评估海口市滨水绿地空间的降温效果，定量分析绿地空间设计要素与降温效益之间的关系。结果表明：滨水绿地空间的有效降温范围为60 m，30 m 缓冲区内的降温效果最显著；绿地空间边缘面积比与降温效益负相关，其他空间要素与降温效益正相关；降温效益受海水干扰的临界距离约为2 300 m。最后提出构建绿地“点- 线- 面”网络布局等缓解城市热环境的绿地综合优化对策。

Abstract:

Climate warming has led to the continuous intensification of various delayed adverse impacts. Adapting to climate change and optimizing the spatial layout of green space systems are key methods for mitigating the urban heat island effect. Using Landsat 8 remote sensing imagery to derive surface temperature as a quantitative data source, this study evaluated the cooling effect of waterfront green spaces in Haikou City and quantitatively analyzed the relationship between green space design elements and cooling benefits. Results indicate that the ratio of green space edge area is negatively correlated with cooling benefits, whereas other spatial elements show positive correlations. The critical distance for seawater interference affecting Haikou's cooling benefits is approximately 2 300 m. Finally, comprehensive optimization strategies for mitigating urban thermal environments are proposed, including establishing a 'point-line-surface' network layout for green spaces.