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Analysis of Pollutant Load Carrying Capacity of the River Tapi Using QUAL2Kw for Surat City

Journal of Environmental Protection 2023年第2期14卷 96-107页

作者： hiralkumari b. patel Namrata D. Jariwala Department of Civil Engineering Sardar Vallabhbhai National Institute of Technology Surat India

River Tapi is the prime water b.dy for Surat city, Gujarat, India. On a long stretch of 22.39 km in Surat city (Kamrej to Causeway) of the Tapi river, there are many identified and non-identified discharge points availab.e. Excessive discharge from these points restricts the efficiency of the self-purification process which ultimately degrades the river water quality. In this paper, an attempt has b.en made to estimate the pollutant load-carrying capacity at different segments of the river Tapi using the QUAL2Kw tool. The study has b.en undertaken with different scenarios: First, the QUAL2Kw model was trained with availab.e river water quality and hydraulic data of the Tapi river in which the complete river segment was divided into 21 reaches. The model was calib.ated and validated with the actual concentrations of the pollutants entering. In the second phase, all the point source, non-point source, and headwater characteristics were considered and the pollutant load-carrying capacity of the river in terms of b.D, ISS, and N-nitrate was found. In the third phase, all the sources of pollutants entering the river have b.en removed and only headwater characteristics were considered for the study. The results indicate that reach no. 21 (21.23ºN, 72.82ºE) has the maximum load-carrying capacity of b.ochemical Oxygen Demand (b.D) up to 2057.7 kg/day, Inorganic Suspended Solids (ISS) up to 85633.8 kg/day, and Nitrate (NOb.3b.) up to 31688.8 kg/day. However, reach no. 4 has the minimum load carrying capacity of b.D up to 1088.1 kg/day, reach 8 carries a minimum of ISS 205341.6 kg/day and NO3 10215.57 kg/day.

关键词： Load Carrying Capacity River Water Quality QUAL2Kw Tapi River

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