Comparison of the Ecological Quality between Different Urban Plannings
FANG Canying;HU Xiujuan;XU Hanqiu;WANG Meiya;LIN Zhongli;Institute of Remote Sensing Information Engineering, Fuzhou University;College of Environment and Resources, Fuzhou University;Key Laboratory of Spatial Data Mining &Information Sharing of Ministry of Education, Fuzhou University;
The rapid urbanization has brought about the benefit to the human society. Nevertheless, it also leads to a series of ecological problems, such as urban heat island and urban waterlogging. According to the blueprint and guidance for urban development, urban planning has a profound implication on the urban ecological quality in various ways. Therefore, a timely and precisely monitoring and assessment of ecological responses to different urban planning techniques have become an important issue for regional decision-makers. To meet this requirement, taking two sports centers that were built in 1980 s and 2010 s, respectively, in Fuzhou city as cases,this study utilized a recently developed Remote Sensing Ecological Index(RSEI) to assess the ecological responses of the two sports centers to their different planning manners. A Sentinel-2A image dated on June 23,2016 was employed to compute the RSEI of two sports centers. Furthermore, three thematic indices, Normalized Difference Impervious Surface Index(NDISI), Normalized Difference Vegetation Index(NDVI) and Modified Normalized Difference Water Index(MNDWI), were utilized to extract the thematic features of impervious surface, vegetation and open water, respectively, from the used satellite images. The overall accuracies of the thematic feature extraction were greater than 90.0%. In addition, the Red Edge Position(REP) was calculated to estimate the state of vegetation growth. Based on the analysis of the main land cover information, the reasons for the differences of ecological quality between the two sports centers were then carried out. Results showed that the RSEI value of the Fujian Olympic Sports Center, built in 1980 s with traditional planning manner, was 0.39,while the Fuzhou Strait Olympic Sports Center, recently-built with green ecological planning thought,had a higher value of 0.42, indicating a higher ecological quality of the Fuzhou Strait Olympic Sports Center.This owes mainly to the green ecological planning for the sports center. The green construction techniques used in the planning of the Fuzhou Strait Olympic Sports Center include the use of pervious surface, pavement without pointing joint, increase in green patches area, and reservation of wind corridors. These have effectively improved the ground wetness, reduced the land surface temperature and dryness, and thus have a greatcontribution to the ecological quality of the center. In addition, due to the immature status of the green plants in the Fuzhou Strait Olympic Sports Center, the vegetation growth in this center was slightly worse than that of the Fujian Olympic Sports Center, suggested by a relatively low mean NDVI value(0.522) of the center, compared with 0.562 of the Fujian Olympic Sports Center. Nevertheless, it is predictable that the NDVI of the Fuzhou Strait Olympic Sports Center could be higher than that of the Fujian Olympic Sports Center after a period of plant growth, and the ecological quality of the center would be further enhanced. On the whole, this study revealed that the adverse impact on ecological quality brought by urban construction could be effectively reduced by the green urban planning technology. Hence, it is essential to formulate and implement the green ecoenvironment conservation measures during the urban planning and construction so as to prevent further deterioration of the ecological environment.
【Key Words】： remote sensing ecological quality RSEI green ecological urban planning Sentinel-2A
【CateGory Index】： TU984.14;X87
【CateGory Index】： TU984.14;X87