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The research progress on major ion chemistry of the water source area of the China’s Middle Route of the South to North Water Transfer Project. Wuhan Botanical Garden, CAS.
2009-09-28
The upper Han River basin with a drainage area of approximately 95,000 km2, is the water source area of the Middle Route of China’s South to North Water Transfer Project. Thus, water quality conservation in the basin’s river network is of great importance. Ph. D Siyue Li in Wuhan Botanical Garden, CAS, supervised by Professor Quanfa Zhang, has been studying the major species of the river basin in the past 4 years, and the related results have been published in Chemical Geology, Journal of Hazardous Materials and Applied Geochemistry.
Ph.D Li studied the evaporation, chemical weathering, atmospheric deposition and their relations with anthropogenic activities in the upper Han River basin using multivariate statistic techniques, principle and theory of water chemistry and geochemistry, Cl reference and the graph of GIBBS. We found that (1) the river water is f a HCO3 and Ca type and the major ion chemistry of the upper Han River basin is mainly controlled by rock weathering with HCO3 and Ca dominating the major ion composition; (2) all the ions show higher concentrations in the dry season except NO3 relating to hydrological regime and generally the precipitation constitutes 1% of the river major ions; (3) the major-ion compositions on the basin-wide scale are within the range of natural water chemistry and also within the safe limits for drinking water standards. However, inorganic species such as Cl, SO4 and NO3 increase greatly compared to the past 10 years due to anthropogenic inputs, thus, there is a possibility of water eutrophication in the near future; (4) the contributions of anthropogenic activities and rock weathering to river solutes, as well as the associated CO2 consumption in the carbonate-dominated basin.
The series study would help develop geochemical study of mesoscale watershed, assess the contributions of river aquatic ecosystem to regional climatic change and determine water chemistry in the global climatic change, and also help water conservation in the basin for the interbasin water transfer project.
