地球科学进展 ›› 2001, Vol. 16 ›› Issue (3): 339 -345. doi: 10.11867/j.issn.1001-8166.2001.03.0339

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小波变换在河西地区水文和气候周期变化分析中的应用
陈仁升,康尔泗,张济世   
  1. 中国科学院寒区旱区环境与工程研究所,甘肃 兰州  730000
  • 收稿日期:2000-10-09 修回日期:2000-12-14 出版日期:2001-06-01
  • 通讯作者: 陈仁升(1974-),男,山东沂水人,博士研究生,主要从事内陆河区水文水资源的研究. E-mail:eskang@ns.lzb.ac.cn
  • 基金资助:

    “九五”国家重点科技攻关项目“河西走廊黑河流域山区水资源变化和山前水资源转化监测研究”(编号:96-12-03-s);国家自然科学基金重点项目“西北干旱区内陆河流域水资源形成与变化的基础研究”(编号:49731030);中国科学院寒区旱区环境与工程研究所知识创新工作项目“内陆河流域SVAT系统和陆面水文过程”(编号:210016)联合资助.

APPLICATION OF WAVELET TRANSFORM ON ANNUAL RUNOFF,YEARLY AVERAGE AIR TEMPERATURE AND ANNUAL PRECIPITATION PERIODIC VARIATIONS IN HEXI REGION

CHEN Ren-sheng, KANG Er-si, ZHANG Ji-shi   

  1. Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou730000,China
  • Received:2000-10-09 Revised:2000-12-14 Online:2001-06-01 Published:2001-06-01

小波时—频分析由于其局部优化性质而优于傅立叶分析。应用Meyer小波,对甘肃河西地区近50 a来年径流量、年降水量和年平均气温做周期分析,发现河西地区水文气象序列的变化周期基本在35 a、22 a、11 a、5~6 a和2~3 a左右的时间尺度上浮动。而这些基本周期正是太阳黑子活动周期或海—气相互作用的周期,说明河西地区水文、气象序列的周期变化受天体运动变化的影响。天体运动直接影响降水和气温的周期变化,进而在一定的下垫面条件下,影响径流的周期变化。

Hexi Region lies in the inland area of Northwest China that is semi-arid and arid region. Because of relatively scare precipitation in this area, the main water resources are the runoff from the mountain drainage basin. Precipitation, evapotranspiration and runoff are the dynamic factors of the water resources balance of this region, while precipitation and air temperature are main factors that effect evapotranspiration. Therefore, it is very important to know the variation regularities of the hydrological and meteorological series in this region. For this purpose, we use the Meyer wavelet transform method that has being used extensively in hydrology and in meteorology, to analysis the periodic regularities of the annual precipitation, yearly average air temperature and annual runoff in Hexi region.The Meyer wavelet function is:
Ψ(ω) ={  0                        |  ω |   [23π,83π]
               (2π)-1/2eiω/2sin(π2v(32π ω - 1))23π  ≤ω≤  43π
              (2π)-1/2eiω/2cos(π2v(34π ω - 1))43π  ≤ω  ≤83π                 (1)
Where  v(x)=x4(35-84x+70x2-20x3)           0 ≤x ≤1
     To discrete Hydrologic and Meteorological seriesr(k), the Lagrange A Trous algorithm is:
    w(i,j) =-∞r(t)1 /a1/2 Ψ((t-b)/a)dt               (2)
where   a=2-j,and b=a·j, they are scaling coefficient and position coefficient respectively;w(i,j) is wavelet coefficient at level i position j.
    Using low-pass wave filter, we can get the approximation coefficient CA1, and using high-pass filter,we can get the detail coefficient CD1. Then, we decompose the CA1into CA2and CD2in the same way, and so on. Now we reconstruct the approximation and detail coefficient Aiand Di,i=1,2,…n, wherenis decomposed level of the hydrologic or meteorological series. At last, we get the reconstructed hydrologic or meteorological series using the next equation:
r(k) =An(k) +Σni=1Di(k)               (3)
    Plot the graph of the reconstructed hydrologic or meteorological series, from which we can find the periods of these series. If the series are long enough, the approximation coefficient Anwill provide the tendency period. Fromi=1~5, the periods thatDireflect are from short to long relatively.The results show that the periods of average annual air temperature and yearly precipitation series of Hexi Region are accordant, and they vary at 35 a, 22 a, 11 a, 5~6 a and 2~3 a or 4 a. It agrees with the variation regularities of the mutual action of sea and atmosphere, and of the sunspot. They both affect the climatic change of the globe. Thus they effect the periodic changes of runoff.

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