Relationship between urban spatial morphology factors and land surface temperature in summer: A case of the central district of Tianjin
Received date: 2021-10-27
Revised date: 2022-02-12
Online published: 2023-02-20
Supported by
National Key Research and Development Program of China(2018YFA0606300)
Copyright
This study uses RS and GIS technique to invert key spatial morphology factors and land surface temperature in the central district of Tianjin. Based on linear regression model and the Cubist model, an in-depth analysis of the relationship between spatial morphology factors (i.e. building density, floor area ratio, building height, and sky view factor) and land surface temperature is accomplished, and the thresholds of key morphology factors are clarified. This study finds that: 1) There is a piecewise linear relationship between building height and land surface temperature, and the response threshold for the mutant change is 13.5 meters; There is a linear negative correlation between sky view factor and land surface temperature. Both building density and floor area ratio show a linear positive correlation with land surface temperature. 2) The Cubist model delineates threshold of building density as 13% and sets the threshold of building height as 9.9 meters. Three sub-rules are established: Rule 1 shows that building density is a positive contributing factor for low development intensity scenarios; Rule 2 shows floor area ratio is a positive contributing factor for medium development intensity scenario; Rule 3 shows that building density and floor area ratio belong to the positive contributing factors, while building height and sky view factor are negative contributing factors for high development intensity scenarios. 3) The Cubist model is more applicable than the global regression model, and it establishes a linear relationship between independent variables and dependent variables for subarea representing different rules which is partitioned by the thresholds of independent variables.
Song Xinbo , Li Gen , Liang Dongpo , Huang He , Guo Jun . Relationship between urban spatial morphology factors and land surface temperature in summer: A case of the central district of Tianjin[J]. SCIENTIA GEOGRAPHICA SINICA, 2023 , 43(2) : 360 -369 . DOI: 10.13249/j.cnki.sgs.2023.02.017
表1 不同研究范围内温度分区面积比例Table 1 Area proportions of LST zones in different research scopes |
| 地表温度分区 | 地表温度区间/℃ | 面积比例/% | ||||
| 第一圈层 | 第二圈层 | 第三圈层 | 第四圈层 | 研究区总体 | ||
| 极低温区 | <33.91 | 0.00 | 0.00 | 0.68 | 1.96 | 1.30 |
| 低温区 | 33.91~35.79 | 0.00 | 0.61 | 2.60 | 9.23 | 6.06 |
| 较低温区 | 35.79~37.68 | 8.04 | 9.18 | 11.81 | 30.53 | 22.02 |
| 中温区 | 37.68~39.57 | 34.18 | 34.03 | 38.68 | 39.45 | 38.41 |
| 较高温区 | 39.57~41.46 | 42.69 | 51.59 | 36.92 | 15.17 | 26.80 |
| 高温区 | 41.46~43.35 | 15.09 | 4.58 | 9.00 | 3.40 | 5.16 |
| 极高温区 | >43.35 | 0.00 | 0.00 | 0.32 | 0.26 | 0.24 |
表2 不同空间形态因子在Cubist模型中的条件贡献与模型贡献Table 2 Condition and submodel contribution of different morphology factors in Cubist model |
| 因子 | 条件贡献/% | 子模型贡献/% |
| 注:空白处为无此项。 | ||
| 建筑密度(BD) | 100 | 81 |
| 建筑高度(BH) | 60 | 41 |
| 容积率(FAR) | 60 | |
| 天空开阔度(SVF) | 41 | |
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