difference between teesta and yamuna river in terms of purity .
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Teesta River of Eastern Himalayas, India.
Study Focus
This article addresses the mechanisms of weathering in the Teesta River, for the first time based on the original data of major ions. Water samples were collected along the Teesta River in Sikkim Himalaya, India. The evaluation of the major ion and trace elements against the standard guideline values and the average chemical composition of world rivers were discussed.
New Hydrological Insights
The predominance of Ca, Mg and HCO3 in all waters reflects the influence of carbonate weathering on the Teesta River. However, an increase in the Na/Ca ratio was linked to the increase of Si downstream, indicating that silicate weathering was predominant in the lowlands of Teesta drainage. The rate of silicate weathering is dependent on an overall balance of key factors including gradient, contact time, temperature and vegetation. The higher concentration of cations was balanced by the SO4 originating from the action of H2SO4 and H2CO3 on carbonates and silicates. Rock weathering (carbonate-silicate weathering) is the key mechanism that controls the major ion chemistry of the Teesta River followed by evaporite dissolution.
The river, however, has still not met the ‘water quality criteria’, reveals study
The quality of water in the Yamuna has improved along the Delhi stretch during the nationwide lockdown, compared to April last year, according to a report by the Delhi Pollution Control Committee (DPCC).
An increased flow of water in the river has also contributed to less pollution, the report said. But the report noted that the Yamuna has still not met the “water quality criteria”.