The relationship between ENSO cycle and high and low-flow in the upper Yellow River |
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| Authors: | LAN Yongchao DING Yongjiang KANG Ersi MA Quanjie ZHANG Jishi |
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| Institution: | 1. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China|
2. Lanzhou Administrative Office of Hydrology and Water Resources of the Upper Reaches of the Yellow River, Lanzhou 730030, China |
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| Abstract: | Firstly, the hydrological and meteorological features of the upper reaches of the Yellow River above Tangnag are analyzed based on observation data, and effects of EI Nino and La Nina events on the high and low flow in the upper Yellow River are discussed. The results show El Nino and La Nina events possess consanguineous relationship with runoff in the upper Yellow River. As a whole, the probability of low flow occurrence in the upper Yellow River is relatively great along with the occurrence of El Nino event. Moreover, the flood in the upper Yellow River occurs frequently with the occurrence of La Nina event. Besides, the results also show dissimilarity of El Nino event occurring time exerts greater impact on high flow and low flow in the upper Yellow River, that is, the probability of drought will be greater in the same year if El Nino event occurs in spring, the high-flow may happen in this year if El Nino occurs in summer or autumn; the longer the continuous period of El Nino is, the lower the runoff in the upper Yellow River is. |
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| Keywords: | El Nino event La Nina event the upper Yellow River high-flow and low-flow |
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