Water Science and Engineering 2011, 4(1) 36-45 DOI:   10.3882/j.issn.1674-2370.2011.01.004  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
time series analysis
wavelet analysis
runoff
human activity
Yellow River   
Authors
SANG Yan-Fang
PubMed
Article by Sang,Y.F

Human impacts on runoff regime of middle and lower Yellow River

Yan-fang SANG1, Dong WANG*1, Ji-chun WU1, Qing-ping ZHU2, Ling WANG3

1. Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, P. R. China
2. China Water International Engineering Consulting Co., Ltd., Beijing 100053, P. R. China
3. Hydrology Bureau of Yellow River Conservancy Committee of Ministry of Water Resources, Zhengzhou 450001, P. R. China

Abstract

In this study, the 54-year (1950 to 2003) monthly runoff series from February, April, August, and November, as well as the annual runoff series, measured at both Huayuankou and Lijin hydrological stations were chosen as representative data, and the continuous wavelet transform (CWT) was applied to analyze the impacts of human activities on the runoff regime of the middle and lower Yellow River. A point of change in 1970 was first determined, and the observed series before 1970 were considered natural runoff while those after 1970 were restored according to linear trends. Then, the CWT was applied to both the observed and restored runoff series to reveal their variations at multi-temporal scales, including the five temporal ranges of 1-4, 6-8, 9-12, 16-22, and 22-30 years, and the trend at the temporal scale of 54 years. These analysis results are compared and discussed in detail. In conclusion, because of the impacts of human activities, there have been significant changes in the runoff regime in the middle and lower Yellow River since 1970. The decaying tendency of annual runoff has become more pronounced, and the inner-annual distribution of runoff has changed, but human activities have had little impact on the periodic characteristics of runoff.   

Keywords time series analysis   wavelet analysis   runoff   human activity   Yellow River     
Received 2010-07-07 Revised 2010-12-15 Online: 2011-03-30 
DOI: 10.3882/j.issn.1674-2370.2011.01.004
Fund:

This work was supported by the National Natural Science Foundation of China (Grants No. 41071018, 41030746, 40725010, and 40730635), the Jiangsu Project Innovation for Ph. D. Candidates (Grant No. CX10B_018Z), and the Excellent Discipline Leaders in Midlife-Youth Program of Nanjing University.

Corresponding Authors: Dong WANG
Email: wangdong@nju.edu.cn
About author:

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