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.
- Amos P, Veale B, Thai NC, Read S (2017) Improving dam and downstream community safety in Vietnam. Hydropower Dams 1:37–43Google Scholar
- Bruijnzeel LA (1983) Hydrological and biogeochemical aspects of man-made forests in south-central Java, Indonesia. PhD Thesis, Vrije Universiteit, Amsterdam, p 256Google Scholar
- Chikamori H, Heng L, Daniel T (eds) (2012) Catalogue of rivers for Southeast Asia and the Pacific–Volume VI. UNESCO-IHP Regional Steering Committee for Southeast Asia and the Pacific. http://unesdoc.unesco.org/images/0021/002170/217039e.pdf
- Ding H, Liu C-Q, Zhao Z-Q, Li S-L, Lang Y-C, Li X-D, Hu J, Liu B-J (2016) Geochemistry of the dissolved loads of the Liao River basin in northeast China under anthropogenic pressure: chemical weathering and controlling factors. J Asian Earth Sci 138:657–671. https://doi.org/10.1016/j.jseaes.2016.07.026 CrossRefGoogle Scholar
- Fan B-L, Zhao Z-Q, Tao F-X, Liu B-J, Tao Z-H, Gao S, Zhang L-H (2014) Characteristics of carbonate, evaporite and silicate weathering in Huanghe River basin: a comparison among the upstream, midstream and downstream. J Asian Earth Sci 96:17–26. https://doi.org/10.1016/j.jseaes.2014.09.005 CrossRefGoogle Scholar
- Holland HD (1978) The chemistry of the atmosphere and oceans. Wiley, Hoboken, p 351Google Scholar
- IWRP (2012) Synthesis report of “Review of water resources planning in the Ca River basin” (in Vietnamese). Institute of Water Resources Planning, Directorate of Water Resources, Ha NoiGoogle Scholar
- Meybeck M (1994) Origin and variable composition of present day riverborne material. Material Fluxes on the Surface of the Earth. National Academic Press, Washington, DC, pp 61–73Google Scholar
- Moore SJ, Anderholm SK (2002) Spatial and temporal variations in streamflow, dissolved solids, nutrients, and suspended sediment in the Rio Grande Valley study unit, Colorado, New Mexico, and Texas, 1993–95. US Geological Survey, National Water-Quality Assessment Program, Water-Resources Investigations Report 02-4224, Albuquerque, NM, 52 ppGoogle Scholar
- Muigai PG, Shiundu PM, Mwaura FB, Kamau GN (2010) Correlation between dissolved oxygen and total dissolved solids and their role in the eutrophication of Nairobi dam, Kenya. Int J Bio Chem Phys 18:38–46Google Scholar