Trends in precipitation extremes and long-term memory of runoff records in Zhejiang, East China

Y. Tian, Ye Tian, YuePing Xu, Martijn J. Booij, Qingqing Zhang, Shengji Lin

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Abstract

Extreme weather events have a huge impact on human beings and therefore it is of vital importance to investigate trends in relevant climatological and hydrological variables. In this study, precipitation and streamflow trends in Zhejiang Province in east China are analysed. Trends in annual and extreme precipitation for 18 meteorological stations (data periods 42 to 58 years) are studied using the Mann-Kendall test. Trends in the plum season (May–July) and typhoon season (August–October) are analysed separately as well. The scaling properties of streamflow for three hydrological stations (data periods 47 to 57 years) are determined using the detrended fluctuation analysis (DFA) method. Results show a positive trend in annual precipitation in the east and a negative one in the west. The major part of Zhejiang shows a positive trend in extreme precipitation, being more significant for 95% non-exceedence values than for 99% non-exceedence values. Precipitation intensity exhibits an upward trend in most areas and in both plum and typhoon seasons, especially in the coastal areas. The results of the DFA method show that longterm memory properties exist for one year in all three rivers. This time scale can be explained since the main source of the streamflow variation comes from climatic variability and the fact that annual streamflow cycles did not change.
Original languageEnglish
Title of host publicationHydro-climatology: Variability and Change
Subtitle of host publicationProceedings Symposium J-HO2
EditorsSteward W. Franks, Eva Boegh, Eleanor Blyth, David M. Hannah, Koray K. Yilmaz
PublisherIAHS Press
Pages227-232
Number of pages254
ISBN (Print)9781907161193
Publication statusPublished - 28 Jun 2011
EventIUGG XXV General Assembly: Earth on the Edge: Science for a Sustainable Planet - Melbourne Convention Centre, Melbourne, Australia
Duration: 27 Jun 20118 Jul 2011

Publication series

NameIAHS publication
PublisherIAHS Press
Number344
ISSN (Print)0144-7815

Conference

ConferenceIUGG XXV General Assembly
CountryAustralia
CityMelbourne
Period27/06/118/07/11

Keywords

  • METIS-279913
  • Precipitation
  • streamflow
  • detrended fluctuation method
  • IR-78684
  • Trends
  • Mann-Kendall
  • China
  • Zhejiang Province

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  • Cite this

    Tian, Y., Tian, Y., Xu, Y., Booij, M. J., Zhang, Q., & Lin, S. (2011). Trends in precipitation extremes and long-term memory of runoff records in Zhejiang, East China. In S. W. Franks, E. Boegh, E. Blyth, D. M. Hannah, & K. K. Yilmaz (Eds.), Hydro-climatology: Variability and Change: Proceedings Symposium J-HO2 (pp. 227-232). (IAHS publication; No. 344). IAHS Press.