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基于改进两步移动搜索法的城市公园绿地供需评价——以成都市三环内为例
胡昂1, 刘洋洋1, 戴维维1, 杜文武2
1.四川大学;2.西南大学
摘要:
基于供需平衡的城市公园绿地可达性研究,对优化城市绿地空间布局,提高公园绿地服务水平具有重要作用。针对传统两步移动搜索法(2SFCA)在精细空间尺度下对人本视角思考不足的问题,从供需两方面同时改进模型,并用于城市公园绿地可达性评价。模型从供给方改进,增加了公园绿地服务范围内服务功能多样性指标,用以衡量公园吸引力;从需求方改进,引入Huff模型,考虑了人们对公园绿地主观选择概率。以成都市三环内为例,分析成都市中心城区公园绿地空间分布及供需现状,结果显示:1)可达性在空间分布上整体呈“西高东低”;2)可达性高的区域呈团状聚集分布;3)区域内供需关系不理想,“供给不足”和“供给匮乏”的区域总面积占比89.49%;4)供需较好的区域聚集在东坡街道及其周边。基于评价结果,对供需失衡区域进行分类,并针对性提出近期微更新、中远期规划及长期适配性的优化策略。
关键词:  风景园林  公园绿地  2SFCA 模型改进  可达性  供需关系
DOI:10.14085/j.fjyl.2022.09.0092.07
分类号:TU985.12+1
基金项目:重庆市自然科学基金(编号 cstc2018jcyjAX0677);四川省自贡市园林局公园活化理论构建与实践前沿研究采购项目
Urban Park Green Space Supply and Demand Evaluation Based on Improved Two-Step Floating Catchment Area Method: A Case Study of the Area Within the Third Ring Road in Chengdu
HU Ang1, LIU Yangyang1, DAI Weiwei1, DU Wenwu2
1.Sichuan University;2.Southwest University
Abstract:
The research on the accessibility of urban park green space based on the balance of supply and demand plays an essential role in optimizing the layout of urban green space and improving the service level of park green space. Aiming at the problem that the traditional two-step floating catchment area method (2SFCA) fails to fully consider the humanistic perspective at the fine spatial scale, this research improves the 2SFCA model from both supply and demand aspects. It applies the improved model to the accessibility evaluation of urban park green space. Specifically, as to the supply-side improvement, the research adds the diversity index of service functions within the service scope of park green space to measure the attractiveness of parks; as to the demand-side improvement, the research introduces the Huff’s model and considers the probability of people’s subjective choice of park green space. Taking the area within the Third Ring Road in Chengdu (hereinafter referred to as the Area) as an example, the research analyzes the spatial distribution and supply and demand status of park green spaces in the central urban area of Chengdu. The results show that: 1) in terms of spatial distribution, the accessibility is “high in the west and low in the east” overall; 2) areas with high accessibility are clustered and distributed in clumps; 3) the supply and demand relationship in the Area is not ideal, with the total area of areas with insufficient or deficient supply therein accounting for 89.49%; 4) areas with good supply and demand are concentrated in Dongpo Sub-district and its surrounding areas. Based on evaluation results, the research classifies areas with imbalanced supply and demand, and proposes pertinent optimization strategies for short-term micro-renewal, mid- and long-term planning, and long-term adaptation.
Key words:  landscape architecture  park green space  2SFCA model improvement  accessibility  supply and demand relationship
引用本文:胡昂,刘洋洋,戴维维,杜文武.基于改进两步移动搜索法的城市公园绿地供需评价——以成都市三环内为例[J].风景园林,2022,29(9):92-98.
HU Ang,LIU Yangyang,DAI Weiwei,DU Wenwu.Urban Park Green Space Supply and Demand Evaluation Based on Improved Two-Step Floating Catchment Area Method: A Case Study of the Area Within the Third Ring Road in Chengdu[J].Landscape Architecture Journal, 2022, 29(9):92-98.