| 近54年定西市降水趋势及突变分析 |
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| 引用本文： | 霍正文,陈文,凡炳文.近54年定西市降水趋势及突变分析[J].水文,2012,32(3):88-92. |
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| 作者姓名： | 霍正文 陈文 凡炳文 |
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| 作者单位： | 甘肃省水文水资源局,甘肃兰州73000 |
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| 摘 要： | 以定西市1956～2009年降水资料为基础,采用线性趋势、Mann-kendall、滑动t检验等方法,分析了定西市近54年降水的变化特征。结果表明:定西市年降水量存在减少趋势,平均递减率为11.7mm/10a;西部地区递减率最大,而北部地区的减少趋势最为明显;定西市年降水量系列1986年发生了显著突变,突变后均值相对减少了47.7mm;除中部地区外,其他各地区也发生了显著性突变,突变减少量在71.1～81.4mm之间,其中西部地区突变量最大;各地区的突变年份不相一致,东部和北部地区发生在1968年,南部地区发生在1993年,西部地区发生在1980年。
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| 关 键 词： | 降水量 趋势 突变 定西市 |
Analysis of Precipitation Tendency and Sudden Change of Dingxi City in Recent 54 Years |
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| HUO Zhengwen
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CHEN Wen
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FAN Bingwen.Analysis of Precipitation Tendency and Sudden Change of Dingxi City in Recent 54 Years[J].Hydrology,2012,32(3):88-92. |
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| Authors: | HUO Zhengwen CHEN Wen FAN Bingwen |
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| Institution: | (Hydrology and Water Resources Bureau of Gansu Province,Lanzhou 730000,China) |
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| Abstract: | According to the precipitation data of Dingxi City from 1956 to 2009,the methods of linear trend,Mann-Kendall and sliding t were used to analyze the precipitation change characteristics.The results show: The precipitation is decreasing in Dingxi City and the mean progressively decrease rate is 11.7mm/10a,with the maximum progressively decrease rate in the western part and the most obvious decrease tendency in the northern part;The obvious sudden change of precipitation series occurred in 1986,the mean deceased by 47.7mm after the change.The change also occurred in other areas except the middle part,the sudden change is during 71.1-81.4mm.The sudden change year is different for various areas,the eastern and northern areas is in 1968,while the south area is in 1993 and west area is in 1980. |
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| Keywords: | precipitation tendency sudden change Dingxi City |
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