Temporal 18O and deuterium variations in hydrologic components of a small watershed during a typhoon event |
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| Authors: | Simin Qu Yifan Wang Minmin Zhou Han Liu Peng Shi Zhongbo Yu |
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| Institution: | 1. National Cooperative Innovation Center for Water Safety &2. Hydro-Science, Hohai University, Nanjing, People’s Republic of China;3. College of Water Resources and Hydrology, Hohai University, Nanjing, People’s Republic of China;4. Hunan Hydro &5. Power Design Institute, Changsha, People’s Republic of China;6. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, People’s Republic of China;7. Department of Geoscience, University of Nevada Las Vegas, NV, USA |
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| Abstract: | The differences between δ18O and δ2H in throughfall and open rainfall were studied for a selected typhoon event in a watershed within the Taihu Lake drainage basin, eastern China. In this event, the isotopic composition of precipitation exhibited a strong temporal variation. Comparison results show that an isotopic composition difference existed not only between gross rainfall and average incremental rainfall, but also between different calculation methods used to derive average. The differences between incremental precipitation and throughfall isotopic composition were observed in this study. Considering the temporal variation in rainfall and throughfall during this typhoon event, the incremental value can have an effect on hydrograph separation more accurately in evaluating the importance of ‘new’ water. In addition, isotopic fluctuations of surface water and groundwater differed from those of rainfall and throughfall throughout the event. |
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| Keywords: | Groundwater hydrogen-2 hydrograph separation isotope hydrology Meilin watershed oxygen-18 precipitation surface water throughfall |
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