Abstract:

Water accessibility is a crucial criterion for assessing the difficulty of accessing water resources in a region as it reflects the spatial difference of water resources within a specific region or basin. Water accessibility is influenced by climate, ecological environment, economic development, and other factors. In this study, we selected five spatial factor indicators—including slope gradient, relative height difference, runoff depth, water quality distribution, and land use type—and integrated them into the Minimum Cumulative Resistance (MCR) model to evaluate water resource accessibility on a grid scale in the Liaohe River Basin. Additionally, we analyzed the degree of coupling coordination between water resource accessibility and spatial water demand. Results reveal that the water resource accessibility index in the study area ranges from 0.164 to 1.0, exhibiting a gradual increase from north to south. The degree of coupling coordination between water resource accessibility and spatial water demand varies from 0.352 to 0.916, with districts and counties as the basic units. Within the basin, slightly uncoordinated areas (with a degree of coupling coordination at 0.3-0.4), nearly uncoordinated (0.4-0.5), and intermediately coordinated (0.5-0.6) account for 0.56%, 0.46%, and 0.74%, respectively. In contrast, areas with excellent coordination (0.6-0.8) and high-quality coordination (0.8-1.0) represent 30.8% and 0.9%, respectively.

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Key words: water resources accessibility, coupling coordination degree, MCR model, Liaohe River Basin