Trend, periodicity and abrupt change in streamflow of the East River, the Pearl River basin

Authors

  • Qiang Zhang,

    Corresponding author
    1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, China
    2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, China
    3. School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, China
    • Correspondence to: Qiang Zhang, Ph.D., Professor, Department of Water Resources and Environment Sun Yat-sen University, Guangzhou 510275, China.

      E-mail: zhangq68@mail.sysu.edu.cn

    Search for more papers by this author
  • Vijay P. Singh,

    1. Department of Biological & Agricultural Engineering and Department of Civil and Environmental Engineering, Texas A & M University, College Station, Texas, USA
    Search for more papers by this author
  • Kun Li,

    1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, China
    2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, China
    3. School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, China
    Search for more papers by this author
  • Jianfeng Li

    1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, China
    2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, China
    3. School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, China
    Search for more papers by this author

Abstract

The East River in the Pearl River basin, China, plays a vital role in the water supply for mega-cities within and in the vicinity of the Pearl River Delta. Knowledge of statistical variability of streamflow is therefore important for water resources management in the basin. This study analyzed streamflow from four hydrological stations on the East River for a period of 1951–2009, using ensemble empirical mode decomposition (EEMD), continuous wavelet transform (CWT) technique, scanning t and F tests. Results indicated increasing/decreasing streamflow in the East River basin before/after the 1980s. After the early 1970s, the high/low flow components were decreasing/increasing. CWT-based analysis demonstrates a significant impact of water reservoirs on the periodicity of streamflow. Scanning t and F test indicates that significantly abrupt changes in streamflow are largely influenced by both water reservoirs construction and precipitation changes. Thus, changes of streamflow, which are reflected by variations of trend, periodicity and abrupt change, are due to both water reservoir construction and precipitation changes. Further, the changes of volume of streamflow in the East River are in good agreement with precipitation changes. Copyright © 2012 John Wiley & Sons, Ltd.

Ancillary