Singh et al.(2005)による〔『Hydrochemistry of reservoirs of Damodar River basin, India: weathering processes and water quality assessment』(1014p)から〕

『インドのダモダー川流域の貯水池の水質化学:風化過程と水質アセスメント』


Abstract
 Water samples collected from the six reservoirs of Damodar River basin in pre- and post-monsoon, have been analysed, to study the major ion chemistry and the weathering and geochemical processes controlling the water composition. Ca, Na and HCO3 dominate the chemical composition of the reservoir water. The seasonal data shows a minimum concentration of most of the ions in post-monsoon and a maximum concentration in pre-monsoon seasons, reflecting the concentrating effects due to elevated temperature and increased evaporation during the low water level period of the pre-monsoon season. Water chemistry of the reservoirs strongly reflects the dominance of continental weathering aided by atmospheric and anthropogenic activities in the catchment area. Higher concentration of SO4 and TDS in Panchet, Durgapur and Tenughat reservoirs indicate mining and anthropogenic impact on water quality. The high contribution of (Ca+Mg) to the total cations, high concentration of dissolved silica, relatively high (Na+K)/TZ+ ratio (0.3) and low equivalent ratio of (Ca+Mg)/(Na+K) suggests combined influence of carbonate and silicate weathering. Kaolinite is the possible mineral that in equilibrium with the water, implying that the chemistry of reservoir water favours kaolinite formation. The calculated values of SAR, RSC and sodium percentage indicate the ‘excellent to good quality’ of water for irrigation uses.

Keywords: Hydrochemistry; Reservoirs; Damodar River; Weathering; Anthropogenic; Water quality; Solute flux; India』

Introduction
Damodar River basin
Materials and methods
Results and discussion
 Hydrochemistry
 Seasonal and spatial variation in the major ions
 Source and mechanism controlling water chemistry
 Quality assessment
 Factor analysis
 Discharge and solute flux
Conclusions
Acknowledgements
References


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