Dissertation > Excellent graduate degree dissertation topics show

A Method of Fuzzy Comprehensive Evaluation Based on Entropy Applied to Water Quality Analysis and Evaluation in Yangzhou Region

Author: XuXiaoYun
Tutor: ChenXiaoMin
School: Nanjing Agricultural College
Course: Soil
Keywords: Fuzzy Comprehensive Evaluation Method Weights Pollutant concentration exceeded the weighting method Entropy Method Surface water quality Yangzhou
CLC: S273.1
Type: Master's thesis
Year: 2009
Downloads: 137
Quote: 0
Read: Download Dissertation

Abstract


Uncertainty of the six areas of evaluation through fuzzy evaluation method, the operator monitoring the value of the monitoring sites, membership function, weight calculation and fuzzy study, the the Entropy Method corrected initial weights and used Yangzhou surface water quality evaluation study of the city, not only to contribute to the evaluation method itself perfect, and also to provide the basis for the environmental sector governance, mainly following conclusions: (1) for the fuzzy evaluation method the six uncertainty problem exists This article studies: evaluation should be selected according to the purpose and object of the evaluation; practice is generally used in the arithmetic average of the monitoring data is correct, Bo Quanmin proposed concentration information using the Hust index correction too idealistic; on river water quality Just follow the implementation of water quality sampling guidelines can evaluate the distribution, using genetic algorithm optimization is a suitable source of pollution survey methods; membership function of the water quality assessment in the form of a flat trapezoid \The most widely used; combine to express the meaning of pollution concentration in excess weighting method and the internal relations of the expression data, \child belonging to the main factors that highlight the type, M (·, ⊕) operator is a weighted average type M (·, ⊕) operator can fully realize the synergies of the various pollution factors on water pollution. (2) shows that the surface water bodies in Yangzhou City, the Beijing-Hangzhou Canal, the concentration of space-time analysis of the water quality of the Yangtze River and along the Grand Canal, the Beijing-Hangzhou Grand Canal and along the Grand Canal in the various types of organic pollutants, nitrogen and phosphorus pollutants and microbial contaminants in the period of Xia Jifeng water the highest concentration, and the highest concentration of ancient canal downstream three points; Yangtze River in the concentration of various pollutants in different months did not differ much. View from different years, the Beijing-Hangzhou Grand Canal, the Grand Canal, the Yangtze River in the concentration of water quality indicators upward trend in 2001 and 2004, followed by gradual improvement, down to 2006, the water quality gradually improved. (3) the use of fuzzy evaluation method for the study of water quality evaluation, Entropy Method of initial weights weight corrected, the results show that this method than the calculated concentration in excess of the weighting method results more reasonable. Final after evaluation showed that: the Beijing-Hangzhou Canal upstream of two measuring points water quality belongs not pollution levels, heavy pollution level of downstream three measuring points; ancient canal five measurement points all to heavy pollution level; Yangtze River on the two measuring points belonging not Pollution levels. Overall, in the 12 study sections, 1/3 of the points belonging to the class Ⅰ water, the remaining 2/3 of the measuring points are Class V water, water pollution is more serious in the study area. The main pollutants in the Beijing-Hangzhou Grand Canal, the Grand Canal and the Yangtze waters is fecal coliform and total nitrogen, followed pollutants including nutrient factors ammonia nitrogen and total phosphorus, and organic matter factor DO, CODcr etc.. Beijing-Hangzhou Canal pollution mainly due to the impact of coastal sewage and a small amount of industrial wastewater discharge; ancient canal pollution mainly due to accepted dozens of heavily polluting industrial wastewater discharges, and accepted by the poor water quality within the moat runoff. Two aspects to be considered for the study of the governance of the water bodies of the Beijing-Hangzhou Grand Canal and along the Grand Canal, from sewage treatment and industrial wastewater treatment.

Related Dissertations

  1. The Research on Evaluation Method of Highway Ecosystem Healthy,X826
  2. The Study on the Management of the Labor Security Inspection,F249.27
  3. On the Program for Evaluating and Cultivating the Core Competitiveness of GY University Press,G239.22
  4. The Design and Implementation of Teaching Quality Assessment Based on AHP for Enterprise Practice,F272
  5. Model and Design for Teaching Evaluation System at Higher Institutions,TP391.6
  6. Research and Implementation of Automatic Generation of SQL Test Cases,TP311.52
  7. Risk Evaluate of Raw Material Supply in Hydropower Development Project,TV51
  8. An Improved Method for Short-term Load Forecasting Based on FFT and Chaos,TM715
  9. Public Hospital Performance Evaluation Method and Application in the 13 Hospitals,R197.3
  10. SGD company ERP software vendor selection research,F270.7
  11. Typical Industrial Park Land Intensive Use Evaluation,F301.24
  12. Selectivity of the structure of China 's foreign exchange reserves,F832.6
  13. Integrated multi- image retrieval technology,TP391.41
  14. Based on the Chinese textile industry transfer Environmental Assessment of Foreign Investment,F426.81;F224
  15. Highway Maintenance Performance Evaluation Institutions,U418.2
  16. Risk-based entropy and Markov chain approach MANET Security Risk Assessment and System Implementation,TN929.5
  17. Chinese Regional Technical Innovation Capability Evaluation,F425;F224
  18. Internet sales of lottery Risk Early Warning System,F224.32
  19. Based on support vector machine textile and apparel Safety Risk Assessment Model,TS941.1
  20. Empirical Research on Producer Services Evaluation and Central Effect of Central Cities in China,F224
  21. Evaluation and Analysis of the Post-sale Service Competitive Ability of the Automobile,F426.471

CLC: > Agricultural Sciences > Agricultural Engineering > Irrigation and water conservancy > Water > Surface water use
© 2012 www.DissertationTopic.Net  Mobile