Author : Kulwinder Singh Parmar, Rashmi Bhardwaj

Today, we are living in a water starved world. Water is an essential element for life. Most of countries fulfill the requirement of water from river water and ground water. Pollution in river water draws attention of government, public, NGO’s and environmentalists in India and world over. Wavelet analysis of water quality parameters COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), DO (Dissolved Oxygen), WT (Water Temperature), AMM (Free Ammonia), TKN (Total Kjeldahl Nitrogen), TC (Total Coliform), FC (Fecal Coliform) and PH (Potential of Hydrogen) monitored at Nizamuddin bridge-mid stream (Delhi) of Yamuna River in India have been studied for last 10 years. 1-D Discrete and Continuous Wavelet transform using Haar Wavelet at level 3 have been analyzed for each water parameter. Discrete Haar Wavelet (level 3) analysis decomposes each data in 5 parts namely s, a₃, d₁, d₂ and d₃. The first part ‘s’ represents signal or raw data, second part ‘a₃’ correspond to amplitude of signal for Haar Wavelet at level 3. d₁, d₂, d₃ represents details of signal or raw data at three different levels. 1D continuous wavelet analysis has four parts; first part on top represents the analyzed signal or raw data, second part contains the scalograms values. The scale of color changes from minimum (dark color) to maximum (light color). The vertical axis shows the frequency values while the horizontal axis represents the number of days. The third part shows the daily variation of coefficients. The fourth part depicts the local maximums of related parameters.

Keywords: Wavelet Analysis, Water Pollutant, Statistical Analysis, Daubechies Wavelet.

Article published in International Journal of Current  Engineering  and Technology, Vol.2,No.1 (March- 2012)