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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.