Analysis of water environment changing trend in Bhagirathi tributary of Ganges in India

摘要

While determining the quality of water for any water body, low, medium and high values of a parameter stand out to be a very important reference. Moreover, these values are used to decide various design parameters based on scientific aspects and its real applications around the world. In this research, determination of trend of water quality (WQ) status for Bhagirathi River was carried out at two sites, Uttarkashi and Tehri station (Tehri Zero point), for 18 WQ parameters and discharges. Preliminary analysis reveals that all parameter concentrations are below the standard permissible limit. No significant correlation was observed between any parameter with respect to discharge; however, out of 18 parameters, 14 were showing negative correlation indicating groundwater source and geological origin. Moreover, a strong correlation was found between 11 parameters at both sites. Seasonal MannKendall test and Sen's slope method have been used to detect trend and to quantify its magnitude. Increasing trend in the concentration of 7 WQ parameters (Q, EC, K+, Na+, SO42-, BOD and Na%) was observed while decreasing trend was observed for 8 parameters (TA, Ca2+, HCO3-, Mg2+, NO2 + NO3, o-PO43-, DO and TH). Overall, WQ of Bhagirathi River was found to be good and hence is suitable for drinking and life-supporting activities.