基于多时相遥感影像的天津市中心城区生态环境质量评价

Evaluation of eco-environmental quality in central urban areas of Tianjin City based on multi-temporal remote sensing images

针对城市扩张使得城市生态环境质量下降的现象,基于2014、2016、2018年三个时相的Landsat8 OLI_TIRS卫星数字产品影像数据,运用遥感生态指数(RSEI)对天津市中心城区生态环境质量变化进行了评价与分析。研究结果表明RSEI对于城市化程度高、城市房屋集中且紧凑的天津市中心城区有较好的适用性,能够对环境质量进行监测,也对空间变化的研究起到了重要的作用。具体表现为:2014、2016、2018年天津市中心城区的RSEI均值分别为0.547、0.463、0.478;RSEI地理位置上从北至南、从西至东呈现出低-高-低的倒U型趋势。天津中心城区的各指数相关性分析表明,干度指标(NDBSI)是影响研究区生态环境质量最大的指数,有很大的消极影响,是天津市中心城区未来改善生态环境的重要参考。在天津市中心城区的成功示范,表明RSEI在生态环境质量评估上的应用可为掌握城市生态环境质量、监测治理区域环境和规划建设城市提供积极的参考。

In view of the decline of urban ecological environment quality caused by urban expansion,based on the Landsat8 OLI_TIRS satellite digital product image data of three time phases in 2014,2016 and 2018,the changes of ecological environment quality in the central city of Tianjin,China,were evaluated and analyzed using remote sensing ecological index(RSEI).The results show that the RSEI has good applicability to the central urban area of Tianjin,which is characterized by high urbanisation,concentrated and compact urban housing,and can monitor environmental quality and also play an important role in the study of spatial changes.It is shown that the average values of the RSEI in the central urban area of Tianjin in 2014,2016 and 2018 were 0.547,0.463 and 0.478 respectively,and the RSEI geographically shows an inverted U-shaped trend of low-high-low from north to south and west to east.The correlation analysis of each index from the central urban area of Tianjin city shows that the normalized difference built-up and soilindex (NDBSI) is the index that affects the quality of the ecological environment in the study area the most,with a high negative correlation with the eco-environmental quality, and is an important reference for thefuture improvement of the ecological environment in the central urban area of Tianjin. The successfuldemonstration in the central urban area of Tianjin shows that the application of RSEI remote sensingecological index in the assessment of ecological environment quality can provide a positive reference forlearning the urban ecological environment quality, monitoring and controlling the regional environment,and planning and constructing the city.