An integrated diagnostic framework for water resource spatial equilibrium considering water-economy-ecology nexus.

The mismatch of spatial distribution between water resources and human activities presents a considerable challenge to the sustainable utilization of water resources. This trend is further exacerbated by the impact of climate change and the increasingly frequent occurrence of extreme weather. Therefore, it is imperative to conduct an in-depth study on water resource spatial equilibrium (WRSE). This paper proposed an integrated diagnostic framework for WRSE considering the water-economy-ecology nexus, in which an improved evaluation index system of WRSE was constructed. The WRSE states of three criteria layers are quantified with the spatial equilibrium indices of water resource endowment, economic and social development, and ecological environment protection. The water resource spatial equilibrium index (WRSEI) was calculated using the Euclidean distance to reflect the overall spatial equilibrium state. The key influencing factors of WRSE are analyzed through the obstacle degree model. The findings indicate that: a) the WRSEI in the Yangtze River to Huaihe River Water Transfer Project (YHWTP) area showed a gradual increase from 0.641 in 2011 to 0.662 in 2020; b) the WRSE level of each criterion layer attained a general equilibrium or fair equilibrium state, and the WRSE state shows a trend from dispersion to aggregation during 2011 and 2020; c) per capita water resources, per capita gross domestic product and per capita urban wastewater discharge are the main factors limiting the realization of a benign WRSE in the YHWTP, with the obstacle degrees reaching 0.347, 0.324 and 0.326 in 2020 respectively. This framework can provide a theoretical reference for the study of WRSE, and provide a scientific basis and suggestions for policymakers to enhance WRSE and achieve sustainable utilization of water resources. [Display omitted] • A diagnostic framework for water resources spatial equilibrium (WRSE) was developed. • The evaluation index system and quantitative method were improved in terms of WEE nexus. • A state discrimination method of WRSE was proposed to identify the overall WRSE state. • The framework was applied to Yangtze River to Huaihe River Water Transfer Project area. • Findings can help formulate water resources planning and sustainable development strategies. [ABSTRACT FROM AUTHOR]