基于粗集权重的改进可拓评价方法在灌区干旱评价中的应用  

Improved extension assessment method based on Rough sets applied to drought evaluation of irrigated areas

作　　者：孙廷容[1] 黄强[1] 张洪波[1] 费良军[1] 

机构地区：[1]西安理工大学水资源研究所

出　　处：《农业工程学报》2006年第4期70-74,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50479024);陕西省教育厅专项科研计划项目(04JK233);陕西省教育厅省级重点实验室项目(02JS37)

摘　　要：在分析了灌区干旱评价特点和目前评价方法不足的基础上,引入了基于非对称贴近度和粗集理论的改进可拓评价方法,有效避免了灌区干旱评价指标界限的纲性量化导致的遗漏问题和单项指标评价结果的矛盾性、不确定性和不相容性。与传统可拓评价方法相比,在指标权重的确定中采用经验因子协调主客观权重,克服了以往决策者过分依赖专家经验知识确定的不足。在等级评价中采用非对称贴近度原则,代替最大隶属度,有效解决最大隶属度原则的失效问题。计算实例表明,采用基于粗集权重的改进可拓评价方法进行灌区干旱评价是切实可行的。On the basis of analyzing the characteristics of evaluation methods, the authors put forward a new model irrigated area drought evaluation and the shortage of about extension method which is improved and based on Rough sets and unsymmetrical proximity principle. Compared to the original method, it is more logical and reasonable for calculating weights and its time to run is less. In other words, the unsymmetrical proximity instead of maximum subordination principle may solve the problem in the extension method. Through case drought evaluation, the model is proved successful in being applied to drought evaluation of irrigated areas.

关 键 词：灌区 干旱评价 可拓方法 粗集理论 贴近度 

分 类 号：S163.4[农业科学—农业气象学] S165.3[农业科学—农业基础科学]