Analysis of drought and flood change based on standard precipitation index(SPI) and its impact on lake water level of Honghu lake

doi:10.14088/j.cnki.issn0439-8114.2020.10.007

Abstract

Abstract: Based on the monthly precipitation data from Honghu meteorological station and water level data from Honghu lake, variables time-scale standard precipitation index(SPI) was calculated. Using SPI, the changes of drought-flood and the temporal characteristics of drought-flood events were analyzed in Honghu lake. The correlation among precipitation, various time-scale SPI and water lever were investigated. The results showed that the frequency and grade of the drought and flood events in Honghu lake in the past 62 years were approximate on the annual scale, little difference on seasonal scale. There was a wetting trend in Honghu, and annual SPI decreased with an average rate of 0.086/10a. SPI declined in spring and autumn, and slightly intensified in drought; SPI increased in summer and winter, and increased in flood and waterlogging. The variability between the water level and the precipitation data was consistent, but the water level later than the precipitation data three months. Variables time-scale SPIand water level were significant correlation. The 3 month scale SPI₃ was most closely correlated with water level of Honghu lake. The 3 month scale SPI₃ agrees well with the variability of the water level. SPI₃ can be used to monitor the water level of Honghu lake.

Key words: drought and flood, standard precipitation index(SPI), Honghu lake, water level

CLC Number:

DENG Yan-jun, ZHOU Shou-hua, YANG Chao, XIA Zhi-hong, LIU Kai-wen. Analysis of drought and flood change based on standard precipitation index(SPI) and its impact on lake water level of Honghu lake[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(10): 32-37.

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