Research On Xianghai Ecosystem Diagnosis Model Based On Improved Attribute Importance And Extenics

The connection project of rivers and lakes in the western part of Jilin Province is an ecological project,but it will have a direct adverse impact on the ecological environment of the water affected area during the construction period of the project.Therefore,it is necessary to make health diagnosis and Research on the sensitive impact factors,so as to minimize the ecological adverse impact.In order to study the ecological response of water body under the construction of the project,this paper takes Xianghai ecological area as the research object to analyze the state response of Xianghai ecological area.(1)Based on the identification of the aquatic ecological impact factors in the project area,combined with the engineering research objectives and actual situation of the Xianghai ecological area,we screened the sensitive factors to carry out the index.Finally,we set up the evaluation index system for the marine ecological area from two aspects of water quality and aquatic organisms.(2)Combine the attribute importance and knowledge granularity of rough set theory,and improve the importance of attributes according to the needs of evaluation objectives.Finally,the index weight calculation model is established to ensure the integrity and rationality of the index system.Through case analysis,entropy weight method,standard deviation method and critical evaluation method are all calculated based on basic data information.The larger the amount of data is,the more accurate the calculation result will be.For the case of small amount of data,there is a certain error,the improved method of this paper is based on the amount of knowledge of each index to build the calculation model,which is more in line with the needs of evaluation in theory,and for the case of insufficient or missing data,it can also carry out weight calculation.(3)Based on the extension theory,the extension diagnosis model of this paper is constructed and compared with the common methods.The comprehensive diagnosis model of this paper based on the extension theory can not only effectively eliminate the impact of human subjective assumptions on the evaluation results,but also does not need a large number of data bases,at the same time,it can measure the advantages and disadvantages of the comprehensive evaluation by evaluating the characteristic value of the grade variable.This method can objectively and effectively get the main influencing factors in the comprehensive evaluation,and improve the operability and pertinence of the evaluation results to the practice of the comprehensive management.(4)Combined with the weight optimization calculation model based on the improved attribute importance and knowledge granularity and the comprehensive diagnosis model based on the extension theory,establish the health diagnosis model of Xianghai ecological area,and make a comprehensive diagnosis and evaluation of their health status,get the overall situation of its ecological health,analyze the existing problems according to the diagnosis results of each index,at last,the author made some suggestion.(5)This paper uses programming language to calculate the comprehensive diagnosis model based on extension theory,construct the health diagnosis system of Xianghai ecological area.