Interaction Analysis of Urban Blue-Green Space and Built-Up Area Based on Coupling Model—A Case Study of Wuhan Central City

Jing Wu,Shen Yang,Xu Zhang

doi:10.3390/w12082185

Abstract

Urban “blue-green” space is the basic element of urban natural ecological space. The rapid urbanization process has a significant impact on the pattern of urban blue-green space and seriously threatens the urban ecological environment. It is of great significance for urban ecological protection and sustainable development to study the change in characteristics of blue and green space during urban expansion. In this paper, a comprehensive method of remote sensing image, landscape pattern analysis, sector analysis, and coupling analysis is applied to analyze the spatio-temporal evolution characteristics and coordinated development level of the blue-green space and built-up area in central Wuhan from 1987 to 2018. The results showed that the land use and landscape pattern in the central city of Wuhan underwent a drastic change process, and the dominant change was the occupation of blue-green space by urban built-up areas, which led to the increase of landscape fragmentation and the decrease of heterogeneity. Urban green space is gradually marginalized and concentrated in local areas. The blue space has an obvious blocking effect on the expansion of the built-up area, and its spatial pattern tends to be stable gradually. In addition, the coupling degree between urban blue-green space and urban built area presents an inverted U-shape, and the coordinated development level among the three has entered a stage of moderate imbalance. It is urgent to strengthen the protection of blue-green space, curb the disorderly expansion of cities, and improve the quality of urban development.

Highlights

Urban landscape pattern is the macroscopic spatial distribution of landscape patches and the overall urban layout that changes dynamically with urban expansion under the influence of many factors, the core of which is the blue-green space [1]
Blue-green space is the sum of blue space and green space, including all water and green space, constituting the overall landscape pattern of the city [2]
The above analysis reveals the spatial effect of urban expansion on the blue-green space

Summary

Introduction

Urban landscape pattern is the macroscopic spatial distribution of landscape patches and the overall urban layout that changes dynamically with urban expansion under the influence of many factors, the core of which is the blue-green space [1]. Blue-green space is the sum of blue space and green space, including all water and green space, constituting the overall landscape pattern of the city [2]. “green space” includes mountain, forest land, farmland, grassland, and ecological corridor, as well as large green space, belt green space, protective green belt, public open space, and green roof in the city [3,4]. Urban blue-green space is a controlling factor closely related to urban sustainable development and residents’ life, and an inseparable “organic aggregation” of urban ecological framework [7,8]. Increasing the proportion of blue and green space is an important way and means to achieve urban ecological security and system integrity, improve urban functions and charm characteristics, and ensure high-quality urban development [9]

Methods

Results

Discussion

Conclusion