| 基于SPEI的渭河流域干旱时空变化特征分析 |
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| 引用本文： | 邹磊,余江游,夏军,王飞宇.基于SPEI的渭河流域干旱时空变化特征分析[J].干旱区地理,2020,43(2):329-338. |
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| 作者姓名： | 邹磊 余江游 夏军 王飞宇 |
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| 基金项目： | 国家自然科学基金重大项目（41890822）；地质矿产调查评价项目（DD20190652）资助 |
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| 摘 要： | 以标准化降水蒸散指数（SPEI）作为评估指标，基于渭河流域28个气象站点1961—2017年实测降水量和气温数据，采用Mann-Kendall（M-K）趋势检验、经验正交函数以及小波变换等方法分析渭河流域干旱时空变化特征，并研究渭河流域干旱与6种大尺度气候因子之间的相关关系，进一步探讨主要气候因子对流域干旱时空分布特征的潜在影响。研究表明：渭河流域在1961—2017年间整体呈现出变旱的趋势。通过经验正交函数分解，渭河流域干旱分布场主要有3种典型模态类型，分别为全局型、西北—东南反向分布型以及东—西反向分布型；同时，大尺度气候因子南方涛动指数SOI与流域干旱分布场具有更好的相关关系，对该区域内干旱变化有较强的影响。
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| 收稿时间： | 2019-05-24 |
Temporal spatial variation characteristics
of droughtin the Weihe River Basin based on SPEI |
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| ZOU Lei,YU Jiang-you,XIA Jun,WANG Fei-yu.Temporal spatial variation characteristics
of droughtin the Weihe River Basin based on SPEI[J].Arid Land Geography,2020,43(2):329-338. |
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| Authors: | ZOU Lei YU Jiang-you XIA Jun WANG Fei-yu |
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| Abstract: | The Weihe River Basin is located in the semiarid and
semihumid transition region of northern China and experiences frequent drought
events; therefore,study of droughts in the Weihe River Basin is of great
importance.Based on the precipitation and temperature data from 28
meteorological stations,the spatial and temporal variation characteristics of
dryness were analyzed by using the Mann-Kendall（M-K）trend
test,empirical orthogonal functions,and wavelet transform analysis.At the same
time,the relationship between drought characteristics and six large scale climatic factors was studied,and the potential impact of the
main factors on the spatial and temporal characteristics of drought was further
discussed.According to the research,we obtained results showing that the Weihe
River Basin exhibits a drought trend between 1961 and 2017.Particularly,after
1990,the drought degree and number of drought phenomena in the basin increased
greatly and the average Standardized Precipitation Evapotranspiration Index (SPEI) decreased from 0.34 during 1961-1990
to -0.37 during 1991-2017.Empirical orthogonal function analysis shows that
there are three typical modes in the wet and dry distribution field of the
Weihe River Basin.The global type with corresponding modal eigenvalues of
50.43% is characterized by either drought or humidity and is the main control
mode of dry distributions in the Weihe River Basin; northwest-southeast reverse
distribution type with corresponding modal eigenvalues of 17.35% shows that the
northwest and southeast regions have different drought characteristics; east west reverse distribution type with corresponding modal eigenvalues
of 5.06% shows that the eastern and western regions have different drought
characteristics.Finally,the research reveals that the Southern Oscillation Index
(SOI),which represents ENSO
events,exhibits the strongest correlation with drought distribution in the
Weihe River Basin and from the perspective of phase analysis,abnormal SOI variations will generally bring more
drought events to the Weihe River Basin. |
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| Keywords: | Weihe River Basin drought standardized precipitation evapotranspiration index empirical orthogonal function wavelet transform analysis |
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