Possible effect of ENSO on annual sediment discharge of debris flows in the Jiangjia Ravine based on Morlet wavelet transforms |
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| Authors: | J H ZHANG F Q WEI S Z LIU CGAO |
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| Institution: | 1. Dr., Research Scientist, Hainan Meteorological Science Institute, South-Sea Meteorology & Disaster Mitigation Research Key Laboratory, Haikou, China, No. 60 Haifu Road, Haikou, China;2. Dr., Research Scientist;3. Research Scientist, Institute of Mountain Hazards and Environment, CAS, No. 9, Sec. 4, South Renmin Road, Chengdu, China;4. Dr. Research Scientist, Institute of Mountain Hazards and Environment, CAS, No. 9, Sec. 4, South Renmin Road, Chengdu, China |
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| Abstract: | The multi-time-scale structures of an annual sediment discharge series of debris flow in the Jiangjia Ravine and the Southern Oscillation index are analysed using the method of Morlet wavelet transformations. The possible effects of El Nino episodes on the annual sediment discharge are discussed by comparing the period variations of ENSO and the discharge. The results show that the annual sediment discharge series of debris flow is related to El Nino episodes. Generally, the annual sediment discharge of debris flow is less than usual during an El Nino episode and debris flow is less active. On the contrary, the annual sediment discharge of debris flows is greater than usual during a La Nina episode and debris flows are more frequent. There is a relationship between the annual sediment discharges of debris flow in the Jiangjia Ravine and the summer Southern Oscillation index, with both having quasi-periodic variations of 2 and 5-6 years. |
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| Keywords: | Debris flow ENSO Wavelet transform Periodic variation |
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