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Water 2017, 9(9), 711;

Variability of Stable Isotope in Lake Water and Its Hydrological Processes Identification in Mt. Yulong Region

Key Laboratory of Western China’s Environmental Systems(Ministry of Education), College of Environmental Sciences, Lanzhou University, Lanzhou 730000, China
State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China
College of Urban and Environmental Sciences, Northwest University, Xi’an 710127, China
Author to whom correspondence should be addressed.
Received: 13 July 2017 / Revised: 11 September 2017 / Accepted: 12 September 2017 / Published: 16 September 2017
(This article belongs to the Special Issue Isotopes in Hydrology and Hydrogeology)
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Lakes are regarded as important nodes in water resources, playing pivotal roles in the regional hydrological cycle. However, the systematic study on lake water balance is scarce in Mt. Yulong region. Here, we study the stable isotope compositions of precipitation, inflowing rivers and lake water to exploit the characteristics of hydrological supply and lake water balance. The results showed that there was a typical spatial distribution of surface isotope in August and April. Relatively high δ18O values with low d-excess were found on the east and west shores of the lake in August and in the middle part of the lake in April. The lowest δ18O with highest d-excess were found in the north and south shores in August and April, respectively. Meanwhile, slight isotopic stratification indicated that the lake water was vertically mixed-well. Subsequently, the evaporation-to-inflow ratios (E/Is) during the two periods were further derived based on the isotope mass balance model. Approximately 51% in August and 12% in April of the water flowing into Lashi Lake underwent evaporation. This study provides a reference for the long-term monitoring and modeling the hydrology processes of the basin, and is important for the regional water resource. View Full-Text
Keywords: Lashi Lake; hydrological processes; Mt. Yulong; stable isotope variations Lashi Lake; hydrological processes; Mt. Yulong; stable isotope variations

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Shi, X.; Pu, T.; He, Y.; Qi, C.; Zhang, G.; Xia, D. Variability of Stable Isotope in Lake Water and Its Hydrological Processes Identification in Mt. Yulong Region. Water 2017, 9, 711.

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