基于SPI和VHI的长江中下游地区干旱时空特征分析  

Spatial-temporal Characteristics of Historical Drought in the Middle and Lower Reaches of Yangtze River Based on StandardizedPrecipitation Index and Vegetation Health Idex

作　　者：向大享[1,2] 姜莹[1,2] 陈喆 李喆[1,2] XIANG Da-xiang;JIANG Ying;CHEN Zhe;LI Zhe(Spatial Information Technology Application Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Wuhan Center for Intelligent Engineering Technology Research,Changjiang River ScientificResearch Institute,Wuhan 430010,China)

机构地区：[1]长江科学院空间信息技术应用研究所,武汉430010 [2]长江科学院武汉市智慧流域工程技术研究中心,武汉430010

出　　处：《长江科学院院报》2024年第3期153-159,165,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发专项(2021YFC3000205);水利部重大科技项目(SKR-2022003)。

摘　　要：近60 a来,长江中下游地区干旱发生频率越来越高,强度不断增强,影响范围不断扩大,持续时间不断变长,对经济发展造成了严重的影响。通过构建长江中下游地区60 a长序列历史降水数据和40 a遥感数据集,基于标准化降水指数、植被健康指数等指标建立干旱监测指数序列库,分析时序干旱指数变化特征,开展旱情时空分布、季节差异、发生频次等指标统计分析,探究旱情发生频率及其时空分异特征、旱情程度等时空特征。研究结果表明:长江中下游地区干旱事件发生具有明显的季节性,春夏季干旱频率高,秋冬季干旱频率低;干旱存在明显区域性差异,易旱地区主要包括湖北北部、湖南南部等地。In the middle and lower reaches of the Yangtze River,drought has had serious impacts on economic development with increasing frequency,intensity,disaster scope and duration over the past six decades.In this study,60-year historical precipitation dataset and 40-year remote sensing dataset were constructed to calculate the meteorological drought and agricultural drought indexes.The drought monitoring index series curves were established based on standardized precipitation index(SPI)and vegetation health index(VHI).The spatial distribution,seasonal distribution,occurrence frequency and other indicators of drought were analyzed to explore the drought’s spatial-temporal differentiation laws.The results show that drought events in the study area are notably season-dependent,with high frequency in spring and summer,and low frequency in autumn and winter.Droughts in the north and west part were more serious than those in the south and east part.Northern Hubei and southern Hunan were prone to suffer from droughts.

关 键 词：干旱 时空特征 SPI VHI 长江中下游地区 

分 类 号：P237[天文地球—摄影测量与遥感]