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Multivariate statistical analysis and geospatial approach for evaluating hydro geochemical characteristics of meltwater from Shaune Garang glacier, Himachal Pradesh, India

Kumar Ramesh, Kumar Rajesh, Bhardwaj Anshuman, Singh Atar, Singh Shaktiman, Kumari Anupma, Sinha Ravindra Kumar

Acta Geophysica

2023

Vol. 71, no. 1

323--339

The study focuses on the hydro-geochemistry of Shaune Garang glacier’s meltwater concerning glacial geomorphology. Seventy-nine water samples (53 in 2016 and 26 in 2017) of ablation season were analysed. The cations were dominant in the order Ca2+ > Mg2+ > Na+ > K+, and the anions in the order HCO3- > SO4 2- > Cl- > NO3-. The result demonstrated that HCO3 - were the abundant ions, accounting for 41.03 and 34.84% of the total ionic budget (TZ). The high ionic proportions of (Ca2+ + Mg2+) versus TZ+ and (Ca2+ + Mg2+) versus (Na+ + K+) were identified as the primary factors influencing dissolved ion chemistry in meltwater. Piper diagram shows that Ca2+–HCO3- type water is the most common, followed by Mg2+–HCO3-. In addition, a remote sensing approach has been used to find the possible source of the chemical constituents in the meltwater. The catchment geology has been mapped on various scales, including diverse rocks and unconsolidated surface materials containing “quartz and carbonate minerals”. Layered silicates (LS) and “hydroxyl-bearing minerals” are not as common as they used to be, but their availability varies greatly in the area where they are found. The distribution of LS minerals within the catchment are majorly found at lower altitudes, which implies the weathering mechanism due to the interaction of meltwater and parental rock. Multivariate analysis revealed that CO3 and SiO3 weathering, sulphate dissolution, and pyrite oxidation dominate dissolved ion concentrations. Chemometric analysis of meltwater hydro-geochemistry through principal component analysis explains 72.1% of the total variance of four PCs. PCs 1, 2, 3, and 4 explain 39.21%, 12.91%, 10.24%, and 9.74% of variance, respectively, in 2016. Similarly, in 2017, four PCs explain 69.91% of the total variance. PC 1, 2, 3, and 4 can explain 26.62%, 20.12%, 12.64%, and 10.52% of variance.

Hydro-geochemical analysis of meltwater draining from Bilare Banga glacier, Western Himalaya

Kumar Ramesh, Kumar Rajesh, Singh Atar, Singh Shaktiman, Bhardwaj Anshuman, Kumari Anupma, Kumar Sinha Ravindra, Gupta Akhilesh

Acta Geophysica

2019

Vol. 67, no. 2

651--660

The changing climate is affecting the melting process of glacier ice and snow in Himalaya and may influence the hydrogeochemistry of the glacial meltwater. This paper represents the ionic composition of discharge from Bilare Banga glacier by carrying out hydro-geochemical analysis of water samples of melting season of 2017. The pH and EC were measured on-site in field, and others parameters were examined in the laboratory. The abundance of the ions observed in meltwater has been arranged in decreasing order for cations as Ca2+> Mg2+ > Na+ > K+ and for anions as HCO3− > SO42− > Cl>− > NO3−, respectively. Analysis suggests that the meltwater is mostly dominated by Ca2+ and 3−. It has been observed that the ionic concentration HCO3− is dominant and Cl>− is the least in the catchment. Piper plot analysis suggests that the chemical composition of the glacier discharge not only has natural origin but also has some anthropogenic input. Hydro-geochemical heterogeneity reflected the carbonate-dominated features (Ca2+–HCO3−) in the catchment. The carbonate weathering was found as the regulatory factor to control the chemistry of the glacial meltwater due to the high enrichment ratio of (Ca2+ + Mg2+) against TZ+ and (Na+ + K+). In statistical approach, PCA analysis suggests that geogenic weathering dynamics in the catchment is associated with carbonate-dominant lithology.