Estimation of Linke turbidity factors for different regions of India
by Laxmi Narain; S.N. Garg
International Journal of Environment and Waste Management (IJEWM), Vol. 12, No. 1, 2013

Abstract: This paper analyses the temporal and spatial variation of Linke turbidity factor (T_L) at five Indian stations; namely New Delhi, Kolkata, Poona, Jaipur and Mumbai. For computation of turbidity, data spanning eight years (1993-2000) for these stations has been procured from the Indian Meteorological Department (IMD) Poona. It is seen that turbidity values are low in winter, ranging from 4 to 6; and high in summer, ranging from 5 to 9. For the post-monsoon season, turbidity values are intermediate, ranging from 5 to 8. It is also seen that turbidity values highly depend on the pollution level of the station; e.g., Kolkata, being an industrialised city, has the highest value of turbidity - as high as 10.2 in May. For Poona, a relatively pollution-free city, the turbidity value is about 5.5 in May. Diurnal variation is small; it is about 14 % in winter and about 11.5% in summer for Poona. Regarding annual variation, it is seen that turbidity remains almost constant for all the years for two stations: Kolkata (T_L = 7.5) and Poona (T_L = 4.6). For the other three stations, Jaipur, New Delhi and Mumbai, the turbidity values are almost constant for the first 4 years (1993-1996) and then there is sharp increase in turbidity values during 1997 for Jaipur (T_L = 6.4) and for New Delhi (T_L = 6.8). Frequency distribution of turbidity values shows that most of the values lie between 3 and 10. For Kolkata maximum frequency, 37%, lies in the range 6.0-7.5; for New Delhi it is 46% and the range is 4.5-6.0.

Online publication date: Sat, 20-Sep-2014

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