章跃芬,郝益民,田济扬,刘荣华,田孟涵

• 1:中国水利水电科学研究院
• 2:水利部防洪抗旱减灾工程技术研究中心
• 3:雅江清洁能源科学技术研究(北京)有限公司

摘要(Abstract)：

干旱是一种复杂的极端气候现象，给世界各个国家和地区的农业生产、经济发展、水资源管理和生态环境等造成了严重损失。子牙河流域长期以来受气候变化和人类活动影响严重，且近年来流域内干旱事件发生的频率和范围表现为加剧趋势。目前，基于卫星的降水定量估计在干旱监测中显示出巨大的潜力，深入研究不同类型卫星产品在流域内的气象干旱识别能力，对子牙河流域未来干旱预警、水资源调配和农业生产都具有重要的科学意义。系统评估了IMERG-F和SM2RAIN-ASCAT卫星降水数据在子牙河流域的月尺度降雨时空精度、误差和准确性，基于3种气象干旱指数(SPI、SPEI和CI),综合评估了各卫星降水产品在多时空尺度上的干旱监测能力和干旱事件识别能力，结合典型干旱事件对比评估了卫星降雨产品间的干旱等级空间分布和空间效率指数差异。结果表明：IMERG-F在干旱指数估计和干旱事件识别中普遍表现出较好的性能(R~2>0.821,RMSE<0.448,POD>0.814,FAR<0.187),而SM2RAIN-ASCAT的干旱效用较差(R~2>0.081,RMSE<1.2,POD>0.442,FAR<0.571)。IMERG-F与GAUGE表现出相似的空间干旱模式(SPAEF为0.507～0.732),能较好地反映区域尺度上的气象干旱中心及干旱影响范围。与SPI和CI相比，所有卫星产品在估计SPEI时精度更高。

关键词(KeyWords)： 气象干旱;IMERG-F;SM2RAIN-ASCAT;干旱特征;区域干旱

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 章跃芬,郝益民,田济扬,刘荣华,田孟涵

DOI: 10.13928/j.cnki.wrahe.2025.S1.032

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