| Asynchronism-synchronism of regional precipitation in South-to-North Water Transfer planned areas |
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| 作者姓名： | ZHENG Hong-xing LIU Chang-ming |
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| 作者单位： | Institute of Geographic Sciences and Natural Resources Research，CAS，Beijing 100101，China |
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| 基金项目： | Key Project of Chinese Academy of Sciences, No. KZ951-A1-203-01 |
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| 摘 要： | 1 IntroductionThe geographical feature of China is quite complex with an obvious spatial heterogeneity. At the sense of spatial distribution of precipitation, under the impacts of the relative position of land to ocean and the monsoon climate, the amount of precipitation tends to decrease from south to north and from southeast to northwest. According to the hydrological regionalization, the North China Plain, one of the social and economic centers of China1,2], is a region short of water re…
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| 收稿时间： | 2000-07-16 |
Asynchronism-synchronism of regional precipitation in South-to-North Water Transfer planned areas |
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| ZHENG Hong-xing,LIU Chang-ming.Asynchronism-synchronism of regional precipitation in South-to-North Water Transfer planned areas[J].Journal of Geographical Sciences,2001,11(2):161-169. |
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| Authors: | Zheng Hong-xing Liu Chang-ming |
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| Institution: | Institute of Geographic Sciences and Natural Resources Research, CAS, |
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| Abstract: | This paper proposes a method on analyzing the asynchronism-synchronism of precipitation of different hydrological regions regarding the S-to-N water transfer areas of eastern China. The general process of the analysis includes three steps. Firstly, we created the rainfall series of the region concerned by calculating the regional average rainfall of the stations in the area with the help of the classical Thiessen Polygon method. Secondly, the standards of assessment indices for wetness or dryness are set according to Gamma distribution function with a certain probability P 37.5% or 62.5% given respectively. Finally, the frequency of nine combinations are counted as the quantitative feature of asynchronism and synchronism in three time scales, that is the yearly, seasonal and monthly scales. The asynchronism-synchronism of two region pairs has been estimated. The results show that the frequency of precipitation asynchronism in 1957-1998 is larger than the synchronism frequency for both the North China-middle and lower Yangtze River pair and for the North China-upper Hanjiang River pair. As for the synchronism phenomena, the frequency of Nd-Sd is rather low. As the combinations that are suitable for water transfers are Nd-Sw, Nn-Sw, Nd-Sn and Nn-Sn, the total frequency of these combinations for North China-middle and lower Yangtze River is 40% on an annual basis, but only 28% in spring when water shortages are most likely to occur. The total frequency of these combinations for North China-upper Hanjiang River is about 24% on an annual basis, but 35% in spring and winter. It should be noted that if future precipitation patterns are similar to that of the period 1957-1998, it is very important to change the natural character of asynchronism-synchronism by enhancing the capability of hydro-projects regulation and improving management of the water transfer project. |
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| Keywords: | synchronous frequency asynchronous frequency South-to-North Water Transfer |
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