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Application of Stable Isotope Tracer to Study Runoff Generation during Different Types of Rainfall Events

by Jianfeng Gou 1,2, Simin Qu 1,2, Peng Shi 1,2,*, Dachen Li 1,2, Xueqiu Chen 1,2, Yifan Wang 1,2, Shuai Shan 1,2 and Wei Si 1
1
College of Water Resources and Hydrology, Hohai University, Nanjing 210098, China
2
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Water 2018, 10(5), 538; https://doi.org/10.3390/w10050538
Received: 14 March 2018 / Revised: 19 April 2018 / Accepted: 21 April 2018 / Published: 24 April 2018
(This article belongs to the Section Hydrology)
The main purpose of this study is to explore the runoff generation mechanism and isotopic variation of precipitation during typhoon and plum rain events in the mountainous region mainly covered with bamboo in southeastern China. The isotopic value of precipitation in plum rain events is more depleted than that of precipitation in typhoon events and has a larger range of d-excess. Typhoon events are affected by frequent temperate and tropical cyclones, the ocean evaporationis expected to be very intenseand marine air parcels move very quickly. As for plum rain events, marine air parcel moves slowly due to the blocking effect of the cold front and air moisture evaporated from the continent plays a significant role in the isotope of precipitation depletion process. The difference of stable isotope values in various water sources allows the two-component hydrological separation to quantify the contribution of the event and pre-event water. The results indicate that the pre-event water accounts for at least 60% of the discharge and the difference in proportion of pre-event water between different types of rain events suggests that the initial state of watershed, rainfall intensity and macropore flow are major control factors of the runoff production mechanism. View Full-Text
Keywords: stable isotope; precipitation; hydrograph separation; Hemuqiao watershed; typhoon event; plum rain event stable isotope; precipitation; hydrograph separation; Hemuqiao watershed; typhoon event; plum rain event
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Gou, J.; Qu, S.; Shi, P.; Li, D.; Chen, X.; Wang, Y.; Shan, S.; Si, W. Application of Stable Isotope Tracer to Study Runoff Generation during Different Types of Rainfall Events. Water 2018, 10, 538.

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