Journal of North China University of Water Resources and Electric Power(Natural Science Edition)

In order to quantitatively judge the overall status of water resources carrying capacity system and diagnose the key indexes which led the system locate vulnerability status under the random,fuzzy or unascertained complex conditions,connection number method was used to effectively handle the uncertainty between assessment indexes and grading standard of regional water resources carrying capacity,the minimum relative entropy principle was used to combine assessment sample connection number and assessment indexes connection number,subtraction based set pair situation is proposed to estimate the deterministic state and development trend of regional water resources carrying capacity system at present from macro-level and to identify vulnerability indexes,and then connection number based assessment and diagnosis analysis method for water resources carrying capacity,named CNAD for short,was established. The research results of CNAD were applied to assess the water resources carrying capacity of Huaibei City show that the water resources carrying capacity grades in 2004,2010 and 2020 are between the general grade and the weak grade,the comprehensive development trend of the region water resources carrying capacity is negative. The assessment and diagnosis analysis results of CNAD are reasonable and reliable owing to the comprehensive utilization of assessment information of single-valued connection number,CNAD is simple and convenient,and CNAD can be applied to assess and diagnose different actual regional resources and environment carrying capacity.