Geochemistry and sediment in the main stream of the Ca River basin, Vietnam: weathering process, solute-discharge relationships, and reservoir impact
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In this study, we investigated the chemical composition of dissolved solids in the Ca River basin, North-Central Vietnam. Water samples were collected from August 2017 to July 2018 at three hydrological stations located in the main stream of the Ca River. Carbonate weathering was found as the dominant process controlling the water chemistry in that area. The average concentrations of dissolved solids generally decreased from upstream to downstream, resulting in low concentrations of the major ions in the downstream basin. Variations in the concentrations of major chemical ions and suspended solids at discharge were also investigated. Major chemical weathering products were found to behave chemostatically with increasing discharges upstream. However, dilution behaviors of solutes were shown in both midstream and downstream. Primary evidence shows that water storage in reservoirs impacts a variety of suspended solids and dissolved solids in the Ca River.
KeywordsCa River Dissolved solids Geochemistry Carbonate weathering Suspended solids
This research was financially supported by the Japan Society for the Promotion of Science (Grant no. R11604). The authors would like to express their deep appreciation to Dr. Mitsuyo Saito of Graduate School Environmental and Life Science, Okayama University for her helpful comments on the manuscript and kind support through the research process. The authors also thank staffs of North-Central Hydro-meteorological Centre, Vietnam for allowing us access to their gauging records. An anonymous reviewer is thanked for critically reading the manuscript and suggesting substantial improvements.
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