张宏利,陈豫,任广鑫,杨改河.近50年来渭河流域降水变化特征分析[J].干旱地区农业研究,2008,(4):236~241 |
近50年来渭河流域降水变化特征分析 |
The characteristics of precipitation variation of Weihe River Basin in Shaanxi Province during recent 50 years |
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DOI:10.7606/j.issn.1000-7601.2008.04.44 |
中文关键词: 降水 时空变化 渭河流域 |
英文关键词:precipitation variation Weihe River Basin |
基金项目:国家重大基础预研项目(2005CCA05300); 科技成果转化项目(05EFN217100423) |
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中文摘要: |
通过对渭河流域21个气象站1951~2005年降水观测资料统计分析,并运用累积距平曲线和信噪比法对渭河流域降水时空分布及变化进行了分析。结果表明:(1)渭河流域降水随海拔高度降低由西向东呈上升趋势,每下降100 m平均增幅约为15.1 mm;(2)自20世纪60年代以来,渭河流域年均降水呈下降趋势,10年平均减幅约为2 mm;(3)经降水变化的突变分析得出近50年渭河流域降水不存在突变年,1982、2003年为渭河流域大的降水转折年。 |
英文摘要: |
Based on the precipitation data of 21stations in Weihe River Basinin Shaanxi Provincein the recent 50years (1951~2005) and using Cumulative departure curve method and signal/noise radio method the temporal-spatial change characteristics of precipitation over the region are analyzed. The results indicate :(1)With the lowering of altitude the precipitation is rising from west to east in the Weihe River basin and the range of increase is approxi mately 15.1mm on average for each 100-meter lowering of altitude;(2) Since the 1960s the average annual precipitation has assumed a drop tendency in the Weihe River with about 2mm on average for each decade;(3) There was no mutation year in the change of precipitationin the Weihe River Basin during the 50years but 1982and 2003seemed as transition years. |
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