Plateau Meteorology

Plateau Meteorology >

2015 , Vol. 34 >Issue 4: 1065 - 1073

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00018

Reconstruction and Variation of Zhaqu River Runoff in Recent 714 Years

  • LI Yuanyuan ,
  • QIN Ningsheng ,
  • SHI Xinghe ,
  • LI Jinjian ,
  • WANG Ringting
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  • Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;2. Sichuan Provincial Agrometeorological Center, Chengdu 610072, China;3. Climate Center of Qinghai, Xining 810001, China

Received date: 2013-08-21

  Online published: 2015-08-28

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Abstract

Based on tree-ring samples collected from Zaduo area in upper reaches of the Lancang River, mean runoff at Xiangda from March to September during 1293-2006 is reconstructed. After adjust the reconstructed series, Linked the reconstructed series before 1955 and the observation data from 1956 to 2006, the temporal evolution characteristics and abrupt changes of the Zhaqu River runoff in recent 714 years were being studied by using the Multi-Taper Method (MTM) of spectrum and the Smoothing t-test method. The results show that there exist pronounced high frequency variations of 2~6 years and low frequency variations of 20~50 years or so. Reconstructed ENSO band is the uppermost components, QBO of time series exhibit significant 18~24 years modulation both amplitude and frequency, inter-decadal quasi-periods signals gradually strengthened during late 19th century to 20th century. The Zhaqu River runoff has experienced obvious 12 high flow periods and 15 low flow periods in the past 714 years, and exists 3 point of abrupt changes, the last abrupt change is negative that occurred at early 20th century.

Key words： The Zhaqu River; Runoff; Reconstruction; Period; Abrupt change

Cite this article

LI Yuanyuan , QIN Ningsheng , SHI Xinghe , LI Jinjian , WANG Ringting . Reconstruction and Variation of Zhaqu River Runoff in Recent 714 Years[J]. Plateau Meteorology, 2015 , 34(4) : 1065 -1073 . DOI: 10.7522/j.issn.1000-0534.2014.00018

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