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[1]LU Xiaoning,HONG Jia,WANG Lingling.Multiple Time-scale Characteristics Variations of Runoff and Sediment Loading of Yellow River to Sea in Recent 50 Years[J].Research of Soil and Water Conservation,2015,22(01):115-122.

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Multiple Time-scale Characteristics Variations of Runoff and Sediment Loading of Yellow River to Sea in Recent 50 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 01 Page number: 115-122 Column: Public date: 2015-02-28

Title:: Multiple Time-scale Characteristics Variations of Runoff and Sediment Loading of Yellow River to Sea in Recent 50 Years

Author(s):: LU Xiaoning^1,2,3, HONG Jia^1,2, WANG Lingling^1,2; 1. Chengdu University of Information Technology, Chengdu 610225, China;
2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China;
3. Key Laboratory of Digital Mapping and Land Information Application of Nationa

Keywords:: Yellow River; runoff; sediment load discharge; water sediment coefficient; multiple time Scale; wavelet

CLC:: P332.5

DOI:: -

Abstract:: The sediment loading and runoff of Yellow River to sea are very important for Yellow River delta and its ecosystem balance. In this view, by using wavelet analysis of complex Morlet Continuous Wavelet Transform on the platform of Matlab, hydrologic series of Lijin station from years of 1964 to 2012, which included annual runoff series, sediment loading series and water sediment coefficient series, were studied to reveal the multiple time-scale characteristics of flow discharges and sediment loadings of Yellow River to sea, all those could make hydrologic series studies of Yellow River more comprehensive and be more real-time. Through this study, it was concluded that there were prominent multiple time-scale characteristics in flow discharges and sediment loads of Yellow River to sea. These features were the most obvious in annual average water sediment coefficient series, and the annual runoff followed, the annual sediment load ranked the last. The inter-decadal variations played the leading role in the whole time domain for the annual mean water sediment coefficient series, with the scale center of 33 years taking as the main period, and the scale center of 18 years as the second period. The annual runoff and annual sediment load of the Yellow River both showed strong inter-decadal periodical oscillation in the whole time domain, with the former showing strongest inter-decadal variations more than 45 years, and the latter more than 36 years. The inter-annual periodical oscillation with a scale center of 4 years, had the highest oscillation energy in local time domains, whereas only limited in early 1970s. Under the control of periods with high water and sediment loading, the Yellow River channel mainly showed scouring prosesses, which was very lower than the secondary saturation state. In the future, this trend of Yellow River would be further significant.

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