Assessment of hydrochemical characteristics of the Taudaha lake, Kathmandu, Nepal

Authors

  • Ganga Paudel Tribhuvan University, Kathmandu, Nepal
  • Bindu Dahal Tribhuvan University, Kathmandu, Nepal
  • Ramesh Raj Pant Tribhuvan University, Kathmandu, Nepal
  • Kiran Bishwakarma Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing
  • Sanjeeb Sharma Tribhuvan University, Kathmandu, Nepal
  • Suman Man Shrestha Tribhuvan University, Kathmandu, Nepal
  • Motee Lal Sharma Tribhuvan University, Kathmandu, Nepal
  • Mahesh Prasad Awasthi Tribhuvan University, Kathmandu, Nepal

DOI:

https://doi.org/10.3126/sw.v15i15.45651

Keywords:

Hydrochemistry, Geogenic weathering, Anthropic impacts, Taudaha Lake

Abstract

Taudaha Lake is an important lake in central Nepal because of its cultural, aesthetic, ecological and economic values. The assessments of water quality and hydrochemical characteristics were carried out by collecting samples from 20 different sites of the lake in August 2021. Analysis of temperature, pH, electrical conductivity, total dissolved solids, turbidity, dissolved oxygen, total hardness, major cations (Ca2+, Mg2+, Na+, K+, Fe3+ and NH4+) and major anions (HCO3-, Cl-, NO3-, SO42- and PO43-) were carried out to assess the overall hydrochemistry of the lake. The obtained data were interpreted by using multivariate statistical techniques to explore pollution sources and characteristics of sampling points and compared with WHO and irrigation guidelines. Slightly alkaline water with less distinct spatial variation was found. The pattern of major ions is in order of Ca2+> Mg2+> Na+> K+> Fe3+> NH4+ and HCO3-> Cl-> SO42-> NO3-> PO43-.  All parameters lie within the limit of WHO guidelines. Principal component analysis (PCA) provides four major components with 73.06% cumulative variance and hierarchical cluster analysis classifies five clusters. Results of PCA, CA, Piper, Gibbs, and mixing plots suggested that the hydrochemistry of the lake is primarily controlled by underlying carbonate-dominate lithology. Similarly, Wilcox diagram suggests that lake water is not severely affected by anthropic pollution and is suitable for irrigational purposes. It is recommended for further study on seasonal, and depth-wise water quality variations along with socio-ecological and ecotourism perspectives in the future.

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Author Biographies

Bindu Dahal, Tribhuvan University, Kathmandu, Nepal

Central Department of Chemistry

Ramesh Raj Pant, Tribhuvan University, Kathmandu, Nepal

Central Department of Environmental Science

Sanjeeb Sharma, Tribhuvan University, Kathmandu, Nepal

Central Department of Environmental Science

Suman Man Shrestha, Tribhuvan University, Kathmandu, Nepal

Central Department of Environmental Science

Motee Lal Sharma, Tribhuvan University, Kathmandu, Nepal

Central Department of Chemistry

Mahesh Prasad Awasthi, Tribhuvan University, Kathmandu, Nepal

Central Department of Environmental Science

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Published

2022-06-14

How to Cite

Paudel, G., Dahal, B., Pant, R. R., Bishwakarma, K., Sharma, S., Shrestha, S. M., Sharma, M. L., & Awasthi, M. P. (2022). Assessment of hydrochemical characteristics of the Taudaha lake, Kathmandu, Nepal. Scientific World, 15(15), 70–85. https://doi.org/10.3126/sw.v15i15.45651

Issue

Section

Research Article