长江流域资源与环境 >> 2021, Vol. 30 >> Issue (4): 956-967.doi: 10.11870/cjlyzyyhj202104018

•　生态环境　• 上一篇    下一篇

喀斯特城市地物覆盖率变化对地表水热通量的影响

王修信1，2，3，王恺宁1，王敏华1，孙涛4，朱启疆3   

  1. （1.广西师范大学计算机科学与信息工程学院，广西 桂林541004；2.广西师范大学广西多源信息挖掘与安全重点实验室，广西 桂林541004；3.北京师范大学遥感科学国家重点实验室，北京 100875；4.广西师范大学生命科学学院，广西 桂林541004）
  • 出版日期:2021-04-20 发布日期:2021-05-17

Effect of Land Cover Changes on Land Surface Water and Heat Fluxes over Karst City

WANG Xiuxin 1，2，3，WANG Kaining 1，WANG Minhua 1，SUN Tao 4，ZHU Qijiang 3   

  1. （1．College of Computer Science and Information Technology，Guangxi Normal University，Guilin 541004，China；2．Guangxi Key Lab of Multi-source Information Mining & Security，Guangxi Normal University，Guilin 541004，China；3．State key Laboratory of Remote Sensing Science，Beijing Normal University，Beijing 100875，China；4．College of life Science，Guangxi Normal University，Guilin 541004，China）
  • Online:2021-04-20 Published:2021-05-17

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摘要： 为了分析中国西南地区桂林喀斯特城市快速扩展所引发的地物覆盖变化对热环境的影响，利用改进METRIC模型和Landsat遥感数据反演喀斯特城市地表水热通量，并使用地面同步观测值进行验证，分析植被、建筑、水体、裸土、裸岩等地物覆盖率变化对地表水热通量的影响。结果表明：地物覆盖率在取值中段存在对地表水热通量影响的显著范围，植被覆盖率在0.1～0.8、建筑覆盖率在0.2～0.8、裸土率和裸岩率在0.2～0.9的影响明显高于地物覆盖率极低和极高范围。在影响显著范围，植被覆盖率、水体覆盖率增加0.1，使得潜热通量分别升高4.0%～12.0%、2.0%～5.0%，而显热通量分别降低5.0%～16.0%、3.0%～11.0%；建筑覆盖率、裸土率、裸岩率增加0.1，使得显热通量分别升高5.0%～17.0%、3.0%～11.0%、4.0%～14.0%，而潜热通量分别降低3.0%～9.0%、2.0%～8.0%、4.0%～9.0%。植被覆盖率增加使得潜热通量升高、显热通量降低的效果明显高于水体覆盖率，建筑覆盖率增加使得显热通量升高、潜热通量降低的效果明显高于裸土率，略高于裸岩率。

Abstract: In order to analyze the effect of land cover change resulted from rapid urban expansion on karst thermal environment of Guilin city in Southwest China, land surface water and heat fluxes were estimated with the modified METRIC（Mapping EvapoTranspiration at high Resolution with Internalized Calibration）model from Landsat images in the study area, and validated with the ground measurements. The change effect of the percent cover of land cover such as vegetation, building, water, bare soil and bare rock on land surface water and heat fluxes was analyzed. Results show that the changes of land cover percentages in the middle of the ranges show significant impact on water and heat fluxes than in the extremely low or extremely high values of the ranges. The significant ranges are from 0.1 to 0.8 for vegetation cover percentage, from 0.2 to 0.8 for building cover percentage, from 0.2 to 0.9 for bare soil cover percentage and bare rock cover percentage.  Within the significant ranges, latent heat fluxes rise 4.0%～12.0% and 2.0%～5.0% while sensible heat fluxes drop 5.0%～16.0% and 3.0%～11.0% in response to the 0.1 increase of vegetation cover percentage and water cover percentage respectively. In contrast, sensible heat fluxes increase 5.0%～17.0%, 3.0%～11.0% and 4.0%～14.0% while latent heat flux decrease 3.0%～9.0%, 2.0%～8.0% and 4.0%～9.0% in response to the 0.1 increase of building cover percentage, bare soil cover percentage and bare rock cover percentage respectively. The increment of vegetation cover percentage shows more significant effect on enhancing latent heat flux and reducing sensible heat flux than that of water cover percentage. Meanwhile, the increment of building cover percentage has more significant impact on enhancing sensible heat flux and reducing latent heat flux than those of bare soil cover percentage, a little than those of bare rock cover percentage.

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