Application of Water Stable Isotopes for Hydrological Characterization of the Red River (Asia)

Water

Thu Nga Do¹  Nho Lan Nguyen²  Anh Duc Trinh³ 

[1] Faculty of Energy Technology, Electric Power University (EPU), 235 Hoang Quoc Viet, Cau Giay, Hanoi 11900, Vietnam;Institute for Technology of Radioactive and Rare Earth Elements (ITRRE), Vietnam Atomic Energy Institute (VINATOM), 48 Lang Ha, Dong Da, Hanoi 11513, Vietnam;Nuclear Training Center (NTC), Vietnam Atomic Energy Institute (VINATOM), 140 Nguyen Tuan, Thanh Xuan, Hanoi 11416, Vietnam;

关键词: regional water balance;    fraction of young water;    mean transit time;    water stable isotopes;    hydropower reservoirs;   

DOI  :  10.3390/w13152051

来源: DOAJ

【 摘 要 】

Fraction of young water (Fyw) and mean transit time (MTT, $\overline{\tau }$) calculated from water isotope profiles are valuable information for catchment hydrological assessment, especially in anthropogenically impacted region where natural conditions may not be decisive to catchment hydrology. The calculation of Fyw and MTT were performed on three subsets of δ¹⁸O_H₂O data collected at the Hanoi meteo-hydrological station, Red River, in three periods; 2002–2005, 2015, and 2018–2019. The mean (min and max) values of δ¹⁸O_H₂O in rainwater over the three periods are, respectively, −5.3‰ (−11.0 and −1.2‰), −5.4‰ (−10.7 and −1.4‰), and −4.5‰ (−13.9 and 1.7‰). The corresponding values in river water are −8.4‰ (−9.8 and −6.9‰), −8.5‰ (−9.1 and −7.7‰), and −8.4‰ (−9.5 and −7.2‰), respectively. The mean of Fyw calculated from the δ¹⁸O_H₂O data for different periods is 22 ± 9%, 10 ± 5%, and 8 ± 3%. Mean transit time is 4.69 ± 15.57, 1.65 ± 1.53, and 2.06 ± 1.87 years. The calculated Fyw (MTT) is negatively (positively) proportional to change in reservoir volume over the three periods, which is logical, since reservoirs tend to keep more water in the catchment and slower down water flow. The strong variation of Fyw and $\overline{\tau }$, two essential variables characterizing the catchment hydrology, represents an anthropogenic impact in the Red River system.

【 授权许可】

Unknown