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Volume 41 Issue 6
Dec.  2022
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AI Bing, HUANG Wei, LI Yangbing. Spatial accessibility analysis of urban parks in typical karst area based on minimum cost of proximity: A case study of Guiyang City[J]. CARSOLOGICA SINICA, 2022, 41(6): 952-961. doi: 10.11932/karst20220607
Citation: AI Bing, HUANG Wei, LI Yangbing. Spatial accessibility analysis of urban parks in typical karst area based on minimum cost of proximity: A case study of Guiyang City[J]. CARSOLOGICA SINICA, 2022, 41(6): 952-961. doi: 10.11932/karst20220607

Spatial accessibility analysis of urban parks in typical karst area based on minimum cost of proximity: A case study of Guiyang City

doi: 10.11932/karst20220607
  • Received Date: 2021-10-13
    Available Online: 2023-01-06
  • Urban parks are important to urban residents' physical and mental well-being, social harmony, and sustainable urban development. Constrained by landform features such as high mountains, steep slopes and inadequate flatlands, cities located in karst mountainous regions often face challenges of inadequate land available for construction, high population density in built-up areas, and small areas of park space per capita. With accelerated urbanization in recent years, some cities have built urban parks in natural karst hills as a means to increase both the quantity and quality of park service. However, some of these parks featured with tower karst or cluster-peaks are subject to limited tourist capacity and low-level barrier-free access and thus fail to meet visitors' basic need for recreation. Therefore, an appropriate design and layout of urban park system in a karst mountain city should be conducted based on such key elements as the size of park patch, the topography of the park site, and the features of population distribution in the city. With the principle of minimum cost of proximity, this study takes Guiyang, a typical karst mountain city, as an example and discusses strategies to improve urban park accessibility in karst mountain cities. In this study, we first set topographic coefficients. The percentage of park space with a gradient less than 15 degrees was determined to indicate the topography of the park. 923 urban parks in Guiyang were then categorized into "comprehensive parks" and "parks in residential areas" based on the sizes of the park patches. They were also classified into "parks with flat landform" and "montane parks" based on their topographic coefficients. Subsequently, with the principle of minimum cost of proximity, we measured the distances of 2,616 residential communities to their nearest and to other different types of parks. These distances were then used to assess the accessibility level of different park types. Thirdly, we conducted the spatial autocorrelation analysis to examine whether there would be spatial aggregation in various types of parks with different accessibility levels and what the pattern would be for their spatial distribution. In this study, we have made the following findings. Firstly, the total amount of urban parks in the study area is large, accounting for 7.54% of the study area and a per capita park area of 28.98 m2. Secondly, features of park patches are evidently dichotomous in terms of their areas. 93.17% of the parks cover an area smaller than 10 hectares, occupying 10.52% of the total park area, whereas 25 large-scale parks with an area larger than 50 hectares account for approximately 80%. Thirdly, the terrain of most parks is mountainous. 53% of the parks are located at a gradient larger than 15 degrees, and 6.73% of the parks in residential areas present a topographic coefficient below 0.6, some of these parks are completely built in tower karst or small cluster-peak areas where service capacity is limited. Fourthly, the accessibility of parks is generally good, with a good match between the park's service area and the population distribution. The minimum cost of 91.89% of the communities to a park is less than 500 meters. There are differences in the accessibility level of different park types, but within a certain distance, accessibility levels are still able to meet the varied needs for park services. For more than 80% of the residential communities, their minimum cost to a comprehensive or a montane park is less than 1,500 meters. Lastly, spatial distributions of various park types are relatively balanced in the central part of residential areas in Yunyan, Nanming, and Wudang. In the central part of Guanshanhu residential area, however, there are less montane parks. In addition, 10% of the residential blocks have high accessibility to montane parks but low accessibility to parks in flat areas. The fact that park service may not cover these blocks caused by karst landform results in residents' difficulties in accessing parks with large open space and high-level barrier-free paths in the vicinity. In order to improve park accessibility and service quality, the areas without the coverage of park services should firstly be provided with the services. Small parks should be built in small-scale residential areas scattered along the edge of the city. In the residential areas close to montane parks but far from parks with flat landform, parks can be built on small patches of smooth terrain. Secondly, the working focus should be placed on enhancing the quality and diversity of park services after satisfying the basic need for park services. In old urban areas where it is difficult to add large parks, efforts should be made to increase small park patches and the park service capacity per unit area. In the new urban development areas, considerations should be given to principles of proximity and quality in distributing different types of parks. Natural features of karst hills can be used to good advantages in building a unique park service system for karst cities. In addition, based on the features of population distribution and spatial patterns of park types in the city, park design in karst hills should proceed appropriately so as to avoid damage to the ecological environment and prevent parks from falling into disuse.

     

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