摘要
针对地质灾害易发性评价过程中单一赋权法的局限性和一般组合赋权法的不足,采用最小平方法和层次分析法两种主观赋权法以及变异系数法和熵值法两种客观赋权法分别确定评价因子权重值,再基于矩估计理论建立最优组合赋权模型,通过求解主、客观权重的相对重要性系数以及模型的最优解来确定最优组合权重,从而充分考虑主观经验和数据的客观性。以甘肃省华池县为例,通过上述方法确定评价因子权重并结合频度分布曲线与自然间断点分级法,确定易发性分区的界限值,最后利用GIS的叠加、重分类功能进行地质灾害易发性分区评价。评价结果与灾害点密度呈正相关,验证了文中所用方法的可靠性。
In view of the limitation of the single assigning weight method and the deficiency of the common combined weight method in the process of susceptibility assessment of geohazards,however,this paper adopts analytic hierarchy process(AHP)and minimum square approach of subjective weights,and also adopts variation co-efficient approach and entropy approach of objective weights to determines the weight values of the evaluation factors,and then builds the optimal combination weighting model based on the moment estimation theory.The optimal combination weights are determined by solving the relative importance coefficients of the subjective and objective weights and the optimal solution of the model,so fully consider subjective experience and the objectivity of the data.Huachi County of Gansu Province was taken for example in the paper,the weights of the assessment factors are determined by the above method,combined with the frequency distribution curve and the natural discontinuous point grading method to determine the boundary value of the susceptibility zone.Finally,using the GIS superposition and reclassification function to achieve the sus-ceptibility assessment of geohazards.The assessment results are positively correlated with the density of disaster sites,which verifies the reliability of the methods used in the paper.
作者
贾丽娜
梁收运
JIA Li-na;LIANG Shou-yun(Key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Enducation,Lanzhou University,Lanzhou 730000,China;Geological Environment Monitoring Institute of Gansu Province,Key Laboratory of Groundwater Engineering and Geothermal Resources of Gansu Provinee,Lanzhou 730050,China)
出处
《地质灾害与环境保护》
2018年第4期61-67,共7页
Journal of Geological Hazards and Environment Preservation
基金
甘肃省国土资源厅地质灾害调查评价项目(201662120202)
关键词
地质灾害
易发性评价
主观赋权法
客观赋权法
最优组合赋权法
geohazards
susceptibility assessment
subjective weighting methods
objective weighting methods
optimal combination weighting metod
