Abstract
Saltwater intrusion is getting more serious in the Vietnam Mekong Delta (VMD) under the impact of upstream dams’ development, water demand increasing, complicated tidal regime that extend 15-25km further of the intrusion length in 2016 compared to the previous years at 8 estuaries. Field investigations were conducted at 500 points to measure salinity concentration longitudinally and transversally (i.e. at five cross-sections) in the Hau River during high tide and low tide conditions. Vertical and longitudinal salinity distributions along two branches of the Hau River are very complicated. At cross-section 3 which is 5km from the river mouth, the difference in salinity concentration between the surface and bottom is approximately 6g/l. The maximum salinity concentration appears at the deepest point and occurs 1 hour after the peak of the water level at the ebb tide. Moreover, the vertical velocity gradually reduces from the surface to the bottom at ebb tide but during the flood tide, vertically maximum velocity appears near the bottom, at the middle of the cross-section. Importantly, various stratification parameters, including Pritchard, Simmon and Richarson numbers show that the partial mixing and moderate stratification condition prevails in the DinhAn branch during a tidal cycle. This finding is helpful in proposing the locations and intake levels of saltwater control works and building operation rules for the existing sluice gates.
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Acknowledgements
This research is funded by Japan-ASEAN Science, Technology and Innovation Platform (JASTIP) and JSPS RONPAKU (Dissertation Ph.D.) Program. The authors would like to thank Group Researchers of KC08.25/16-20 Project for their kindly help in the site and data sharing.
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Mai, N.P., Thang, T.D., Kantoush, S., Sumi, T., Van Binh, D., Trung, L.V. (2020). The Processes of Saltwater Intrusion into Hau River. In: Trung Viet, N., Xiping, D., Thanh Tung, T. (eds) APAC 2019. APAC 2019. Springer, Singapore. https://doi.org/10.1007/978-981-15-0291-0_199
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DOI: https://doi.org/10.1007/978-981-15-0291-0_199
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