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

XIANG Da-xiang; JIANG Ying; CHEN Zhe; LI Zhe

doi:10.11988/ckyyb.20230196

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (3) : 153-159. DOI: 10.11988/ckyyb.20230196

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

XIANG Da-xiang^1,2, JIANG Ying^1,2, CHEN Zhe^1,2, LI Zhe^1,2

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Abstract

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.

Key words

drought / spatial-temporal characteristics / SPI / VHI / middle and lower reaches of Yangtze River

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XIANG Da-xiang, JIANG Ying, CHEN Zhe, LI Zhe. Spatial-temporal Characteristics of Historical Drought in the Middle and Lower Reaches of Yangtze River Based on Standardized Precipitation Index and Vegetation Health Idex[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(3): 153-159 https://doi.org/10.11988/ckyyb.20230196

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