《Table 1 Contradictory scenario of regional water resource supply and demand in the context of IUAM

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《水资源可持续承载力的概念与实证:以中国大陆为例（英文）》

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Note:superscripts P，E，D stand for the 3 water resource subsystems of the regional PRED system，corresponding to water sectors of human living，eco-environment and production，respectively.

According to formula（4），the concept of WSCC，involved in the double sustainable connotation，is a dynamic assessment indicator focusing on human demands and WSCC.Therefore，WSCC is elastic in a certain period.It is feasible to promote sustainable development of a regional water resources system through engineering technology or to make reasonable criteria.In the regional PRED system，water resource consumption is the material basis to support human living and development.A series of intervening measures or incentive policies will be used for improvement，if either human living，production and consumption cause over-consumption of water resources，or undersupplying of regional water resources reduces the residential living level，production efficiency and eco-environment quality，or an imbalanced allocation of water resources threatens regional sustainable development.Therefore，the public comprehensive judgment of the current water resources system condition is the precondition of taking adjustment and control actions.Hence，referencing relevant research results（Zuo et al.，2008；Yao et al.，2008），and the concept of warning color signals used in Meteorology and Science of Disaster，a classification standard of sustainable stages and the warning signals of regional water resources system was proposed（shown in Table 2）according to WSI.In conjunction with Table 1，this system was used to assist in the assessment of the regional water resources system.