IMERG和SM2RAIN卫星降雨产品在子牙河流域的干旱效用评估

章跃芬; 郝益民; 田济扬; 刘荣华; 田孟涵

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

水利水电技术（中英文） ›› 2025, Vol. 56 ›› Issue (S1) : 202 -212. DOI: 10.13928/j.cnki.wrahe.2025.S1.032

水文水资源

IMERG和SM2RAIN卫星降雨产品在子牙河流域的干旱效用评估

章跃芬 ¹^,² ,
郝益民 ³ ,
田济扬 ¹^,² ,
刘荣华 ¹^,² ,
田孟涵 ¹^,²

作者信息 +

Evaluation of drought utility of IMERG and SM2RAIN satellite precipitation estimates in Ziya River Basin

Yuefen ZHANG ¹^,² ,
Yimin HAO ³ ,
Jiyang TIAN ¹^,² ,
Ronghua LIU ¹^,² ,
Menghan TIAN ¹^,²

Author information +

文章历史 +

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摘要

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(R²>0.821,RMSE<0.448,POD>0.814,FAR<0.187),而SM2RAIN-ASCAT的干旱效用较差(R²>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。

Abstract

Drought is a complicated extreme climate phenomenon, which has caused serious losses to agricultural production, economic development, water resources management and ecological environment in various countries and regions. The Ziya River Basin has been seriously affected by climate change and human activities for a long time, and the frequency and scope of drought events in the basin have shown an increasing trend in recent years. At present, satellite-based precipitation quantitative estimation shows great potential in drought monitoring, and in-depth research on the meteorological drought identification ability of different types of satellite products in the basin has important scientific significance for future drought warning, water resource allocation and agricultural production in the Ziya River Basin. The spatio-temporal accuracy, error and accuracy of monthly rainfall data of IMERG-F and SM2RAIN-ASCAT in Ziya River Basin were systematically evaluated based on three meteorological drought indices(SPI, SPEI and CI). Drought monitoring ability and drought event identification ability of satellite precipitation products on multiple time scales and spatial scales were evaluated comprehensively. The difference of drought grade spatial distribution and spatial efficiency index among satellite precipitation products was compared with typical drought events. The result show that: IMERG-F showed good performance in drought index estimation and drought event identification(R²>0.821, RMSE<0.448, POD>0.814, FAR<0.187). The drought effectiveness of SM2RAIN-ASCAT was poor(R²>0.081, RMSE<1.2, POD>0.442, FAR<0.571). IMERG-F and GAUGE show similar spatial drought patterns(0.507<spaef<="" p=""> </spaef