Abstract
The experiments of single factor evaluation method, principal component analysis and voronoi area weighting factor method on the sample data of Liangzi Lake in October 2012 combined with the national surface water environment quality standards can get the map of comprehensive water quality distribution by Kriging interpolation. The analysis shows, the grades of comprehensive water quality gained by three methods are all only class III or class IV, and the quality of water is different from east and west that the water quality of east is better. However, the percent of IV class water is higher in the result of single factor evaluation method means class IV is the main grade of water quality. The result of principal component analysis shows the percent of class Ⅲ water is higher than other classes. The result of voronoi area weighting factor method shows the percent of IV class is higher than other classes. CODMn is the main factor that influences the method of singal factor evaluation and reduces the grade of water quality overall. The effect of single factor is reduced by principal component analysis, and the analysis on water quality is more accurate. The voronoi area weighing factor method reduces the effect of single factor and extends the content, can make a comprehensive evaluation on water quality.
Highlights
Water is the important environmental factor for the survival of people
According to the results of single factor analysis, the water quality of Liangzi Lake are graded as Class III and Class IV only, and the number of observation points meeting the requirements of Class III surface water reached 11, accounting for 3.2%; the number of observation points meeting the requirements of Class IV surface water reached 53, accounting for 74.5%
According to the results of principal component analysis, the water quality of Liangzi Lake are graded as Class III and Class IV only, and the number of observation points meeting the requirements of Class III surface water reached 59, accounting for 70.3%; the number of observation points meeting the requirements of Class IV surface water reached 6, accounting for 29.7%
Summary
Water is the important environmental factor for the survival of people. The comprehensive evaluation on water quality is an important fundamental work to the treatment of water environment. Evaluating the monitoring data of water quality reasonable can formulate scientific renovation plan and take effective measures. Nowadays the common methods to water quality evaluation contains single factor evaluation method, principal component analysis, fuzzy comprehensive evaluation method, grey evaluation method, matter element analysis method and so on [1]-[3]. How to cite this paper: Wang, H., Yao, J.L. and Li, Y.Q. (2016) An Analysis of Water Environment Factors and an Evaluation of Water Quantity of Liangzi Lake. Journal of Geoscience and Environment Protection, 4, 44-51.
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