ABSTRACT
The significance of the information contained in the fluctuation and randomicity of the time series of each pollutant in the environmental quality assessment has been pointed out for the first time in the world by describing the environmental quality assessment. This paper made a comparative study of three different computing methods, namely The Same Starting Point Method; Striding Averaging Method and Stagger Phase Averaging Method, all of them can be used to calculate the Hurst index which reflects fluctuation and randomicity in quantity. The study is based on the real data of the water quality in Shazhu Lake Tai, Wuxi, Jiangsu Province. The result shows: among all the three methods, Stagger Phase Averaging Method is recommended while calculating the Hurst index of the pollutants time series from the aspect of the statistic regularity.
