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甘肃省河东地区气象-水文干旱时空演变特征

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干旱半干旱区是气候变化和人类活动的敏感和脆弱区,研究地区干旱时空演变特征有助于成灾机理分析.甘肃省河东地区是我国典型干旱半干旱区,主要依靠自然降水维持农业生产,旱灾尤为突出.基于标准化降水指数和标准化径流指数探讨河东地区气象-水文干旱的时空演变特征,结果表明:(1)气象干旱多发生于春夏两季及陇东地区,较少发生季节型以上气象干旱;(2)水文干旱较气象干旱历时更长,多年尺度干旱时有发生;(3)不同季节气象-水文干旱滞时不同,春夏两季几乎无滞后,秋季约滞后1个月,冬季约滞后4个月;(4)陇中和陇东地区历史受灾/成灾面积较大.本研究可为干旱半干旱区的旱灾预警评估和旱灾防控工作提供参考.
Spatiotemporal Evolution Characteristics of Meteorological and Hydrological Droughts of Hedong Region in Gansu Province
Since arid and semi-arid regions are sensitive and vulnerable to both climate change and human activities,studying the spatiotemporal evolution characteristics of droughts accelerates understanding disaster mechanism.The Hedong region(HDR)in Gansu Province is a typical arid and semi-arid region,which depends on precipitation to maintain agricultural production.Meteoro-logical and hydrological droughts are detected based on the standardized precipitation index and the standardized runoff index.The results show that:(1)Meteorological droughts in HDR mostly occur from spring to summer in the Longdong area,with a dura-tion of less than three months.(2)Hydrological droughts last longer compared to meteorological droughts and may occur at multi-year scales.(3)The propagation between meteorological and hydrological droughts is varied in different seasons.There is almost no lag time in spring and summer,about one month in autumn and four months in winter.(4)The areas affected by drought di-saster most are the Longzhong and Longdong regions.This study could provide scientific guidance for drought early-warning and prevention in arid and semi-arid regions.

meteorological droughthydrological droughthistorical drought disasterarid and semi-arid regions

程玉菲、刘德地、陈文、周婉、邢姝颖

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甘肃省水利科学研究院,甘肃兰州 730000

武汉大学水资源工程与调度全国重点实验室,湖北武汉 430072

气象干旱 水文干旱 历史干旱灾害 干旱半干旱区

国家自然科学基金甘肃省水利厅前期费项目(2022)甘肃省水利厅和水利科学试验研究及技术推广计划(2022-2023)甘肃省水利厅和水利科学试验研究及技术推广计划(2022-2023)

51879194甘水规计发[2022]331号22GSLK00123GSLK014

2024

10.19797/j.cnki.1000-0852.20230125

水文
水利部水文局 水利部水利信息中心

水文

CSTPCD北大核心
影响因子：0.742
ISSN：1000-0852
年,卷(期)：2024.44(2)
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