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Article

Application of Stable Isotopic Compositions of Rainfall Runoff for Evaporation Estimation in Thailand Mekong River Basin

1
Department of Civil Engineering, Faculty of Engineering, Naresuan University, Phitsanulok 65000, Thailand
2
Department of Earth and Environmental Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
3
Department of Water Resources, Ministry of Natural Resources and Environment, Bangkok 10400, Thailand
4
Thailand Institute of Nuclear Technology, Nakonnayok 26120, Thailand
5
Department of Technical Education, Faculty of Industrial Education, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand
*
Author to whom correspondence should be addressed.
Water 2022, 14(18), 2803; https://doi.org/10.3390/w14182803
Received: 16 August 2022 / Revised: 6 September 2022 / Accepted: 7 September 2022 / Published: 9 September 2022
(This article belongs to the Section Hydrology)
The Mekong River Basin comprises approximately 38% of Southeast Asia. Our study area comprises the right-bank tributaries, which drain a substantial portion of Northeast Thailand. This study aimed to estimate the evaporative losses from streams during the 2013–2015 period. The normal and warm El Niño–Southern Oscillation (ENSO) phases caused higher temperatures and low rainfall in the 2014–2015 period. The results show that the local meteoric water line for precipitation isotopes had seasonal variation due to variable precipitation. The enrichment of river isotopes indicated that streams lost an average of 4% of their water through evaporation. During the cooling ENSO phase, significant evaporation occurs due to the deep convection that typically occurs in tropical regions. In contrast, evaporation was low during the warm ENSO phase because of its geographic location. The El Niño year’s isotope values were significantly more enriched than the La Niña year’s, showing that precipitation and positive temperature anomalies affected the isotopic compositions in the continental basin. Furthermore, the deuterium excess helped distinguish the relative contributions of the wet and dry seasonal sources to the moisture origin, indicating that the predominant source of moisture is inland evaporation, with a small contribution from the ocean. View Full-Text
Keywords: isotope; monsoon; Mekong River; ENSO; tropical isotope; monsoon; Mekong River; ENSO; tropical
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MDPI and ACS Style

Laonamsai, J.; Ichiyanagi, K.; Patsinghasanee, S.; Kamdee, K.; Tomun, N. Application of Stable Isotopic Compositions of Rainfall Runoff for Evaporation Estimation in Thailand Mekong River Basin. Water 2022, 14, 2803. https://doi.org/10.3390/w14182803

AMA Style

Laonamsai J, Ichiyanagi K, Patsinghasanee S, Kamdee K, Tomun N. Application of Stable Isotopic Compositions of Rainfall Runoff for Evaporation Estimation in Thailand Mekong River Basin. Water. 2022; 14(18):2803. https://doi.org/10.3390/w14182803

Chicago/Turabian Style

Laonamsai, Jeerapong, Kimpei Ichiyanagi, Supapap Patsinghasanee, Kiattipong Kamdee, and Nattapong Tomun. 2022. "Application of Stable Isotopic Compositions of Rainfall Runoff for Evaporation Estimation in Thailand Mekong River Basin" Water 14, no. 18: 2803. https://doi.org/10.3390/w14182803

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