Quantitative assessment of watershed water resources security is very important for further increasing the sustainable utilization level of watershed water resources,optimizing the industrial structure,and releasing the conflict between supply and demand of water resources.On the basis of expert consult and water resources security investigation,the primary assessment index system of watershed water resources security is established,the index system is filtrated by the accelerating genetic algorithm based fuzzy analytic hierarchy process,and the final index system of watershed water resources security and its grading criterion are set up.A new method is presented to determine the relative membership degree function of variable fuzzy set of the assessed samples according criterion grades by using set pair analysis method,and a new quantitative assessment model of watershed water resources security, named SPA-QAM for short,is established by using fuzzy comprehensive evaluation method.The research result of SPA-QAM applied to Chaohu watershed shows the watershed lies in the critical security state,the population growth must further be controlled,the water saving agriculture technology must be spread,and the water consumption of unit agriculture production value must be reduced in order to further heighten the safeguard degree of the watershed water resources security.SPA-QAM mines fully the information of the relationship degree function between the assessed samples and the criterion grades,the evaluation results of SPA AM are reliable and possesses higher precision. SPA-QAM is visual,simple and general,and can be applied to different comprehensive assessment problems under the known grading evaluation criterion.
