Evaluation and Analysis of the Impact of Coastal Urban Impervious Surfaces on Ecological Environments

Abstract

Urbanization as a human activity alters the surface structure, modifying the urban ecological environment. In this study, the greenness, wetness, building index, and heatness of Dalian, a coastal city in northeast China, were extracted from the summer MODIS remote sensing data of 2010 and 2022, and the remote sensing ecological index (RSEI) was created based on spatial principal component analysis. The artificial impervious surface fraction (AISF) in Dalian was extracted to analyze the impact of urban expansion on urban ecological environment with the background of urbanization, the spatial and temporal change characteristics of the urban ecological environment in Dalian from 2010 to 2022 were thoroughly evaluated. The results show that: (1) Dalian's RSEI in 2010 and 2022 primarily ranged from 0.2 to 0.8. During 2010-2022, the RSEI in urban built-up areas decreased from 0.2-0.4 to 0-0.2. However, the areas of RSEI approaching 1 have increased significantly in the past ten years, mainly distributed in original forest land or ecological land in the northern areas of Dalian. (2) From 2010 to 2022, Dalian's natural environment showed a positive development in which, the area with enhanced ecological quality accounted for 59.09%; however, the proportion of ecological land with RSEI greater than 0.8 declined from 76.64% to 51.05% and the proportion of urban building land rose from 1.11% to 11.85%, demonstrating that urbanization has had a substantial impact on the urban natural environment and has altered the urban land use structure. (3) The AISF of Dalian's urban center area was found to exceed 70% and is centered in the south's densely built-up area. The urban expansion boundary extending from the city center to the surrounding territory has an AISF ranging from 20%-70%. This study objectively analyzed the geographical and temporal features of the ecological environment, as well as the impact of urbanization, and offers constructive recommendations for urban building design and population distribution optimization.

XGBoost-Based Analysis of the Relationship Between Urban 2-D/3-D Morphology and Seasonal Gradient Land Surface Temperature

“…Therefore, as the gradient increases, the expansion of non-artificial surfaces enhances the land's capacity to absorb water, which in turn strengthens the correlation between indices such as PD, SHDI, PWG and FOR [84], [85]. During summer and autumn, the heat island effect predominates, and the heat absorption capacity of artificial surfaces intensifies [22].…”

“…[15]- [18]. Remote sensing technology has been utilized to assess urban morphology and thermal environmental changes [19]- [22]. Through the combination of remote sensing and GIS, dynamic information, such as urban spatial distribution, impervious water ratio, and building forms, can be obtained and processed, creating a scientific foundation for urban planning and design [23], [24].…”

Spatial Characteristics and Influencing Factors of Night Cultural and Tourism Consumption Agglomeration Areas in China

“…Meanwhile, the impact of the global COVID-19 epidemic has led to a certain degree of spatial isolation in China [79], causing public anxiety, depression, and other mental health problems [2], [8], providing a contrasting pressure to the increasing public demand for tourism and leisure. Coupled with the fact that some problems [80], [81] have emerged during the implementation of new urbanization in China in recent years, such as the similarity of town development patterns and the loss of traditional culture [82], the National Development and Reform Commission of China has been exploring new paths for urbanization development, aiming to maintain sustainable and healthy economic development. Tourism, as a modern emerging service and comprehensive industry, has certain advantages over industrial development paths; thus, vigorously developing tourism and taking the path of tourism urbanization provide a "nonindustrial" model option for urbanization paths, which is very important and worthy of promoting it as a new urbanization developmental direction.…”

Mapping Urban Expansions along China–Europe Railway Express with the 30 m Time-Series Global Impervious Surface Area (GISA-2) Data from 2010 to 2019

“…The variation in impervious surfaces reflects cities' socio-economic and urban development [12]. The ISA is crucial for biodiversity [13,14], water quality [15], urban heat island effects [16,17], and ecological environments [18,19]. The emergence of ISA products has provided new indicators for measuring human activity intensity and reflecting the urban development process [20].…”