Spectral Analysis of Biochemical Oxygen Demand in River Water: An Analytical Approach of Discrete Wavelet Transform

摘要

Excess of biochemical oxygen demand (BOD) is the most outstanding danger at present for survival of living being in the surface water. In this paper, we analyse the BOD of surface water using wavelet analysis. Wavelet analysis is a new mathematical tool developed in last two decade. Wavelets have special ability to examine signals or data sets simultaneously in both time and frequency scale. Consequently, we get hidden information of signal in a new plane which is called time frequency plane. In the present manuscript we interpret the data of BOD of river Ramganga by wavelet method. We used ‘db8’ wavelet of Daubechies wavelet family. The data of BOD is taken during the period from Jun 2005 to May 2008.