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[1]ZHENG Jintao,PENG Tao,DONG Xiaohua,et al.Evolution Characteristics of Meteorological Drought and Assessment of Risk of Disaster Factors in the Three Gorges Reservoir Area[J].Research of Soil and Water Conservation,2020,27(05):213-220.

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Evolution Characteristics of Meteorological Drought and Assessment of Risk of Disaster Factors in the Three Gorges Reservoir Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 05 Page number: 213-220 Column: 目次 Public date: 2020-08-20

Title:: Evolution Characteristics of Meteorological Drought and Assessment of Risk of Disaster Factors in the Three Gorges Reservoir Area

Author(s):: ZHENG Jintao¹, PENG Tao^1,2,3, DONG Xiaohua^1,2,3, LIU Ji^1,2,3, CHANG Wenjuan^1,2,3, LIN Qingxia^1,2,3, WANG Jiabao¹; (1.College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China; 2.Hubei Collaborative Innovation Center for Water Resources Security, Wuhan 430072, China; 3.Engineering Education Center of Ecological Environment of the Three Gorges Reservoir Area, Ministry of Education, Yichang, Hubei 443002, China)

Keywords:: meteorological drought; SPI; spatial-temporal distribution; disaster risk; the Three Gorges Reservoir Area

CLC:: P426.616

DOI:: -

Abstract:: In recent years, the intensity and frequency of drought disasters in the Three Gorges Reservoir Area(TGRA)have shown an aggravating trend. Therefore, it is of great significance to identify the spatial-temporal characteristics of drought and the risk factors of drought. The precipitation data of 18 meteorological stations in the TGRA and surrounding area from 1960 to 2015 were used to analyze the spatial-temporal evolution characteristics of meteorological drought, and further evaluate the risk of drought disaster factors in the TGRA based on the standardized precipitation index(SPI), run theory, and Mann-Kendall test. The results showed that:(1)the annual SPI value in the TGRA indicated a slow downward trend, and the whole area tended to be arid, with an abrupt change point in 1989;(2)there was not significant change in drought station ratio in each season, and it showed a slowly increasing trend in general; the drought intensity in summer and autumn showed an upward trend, while it was the opposite in spring and winter; among the four seasons, the most significant increase of drought intensity and drought station ratio was autumn; the drought intensity decreased in the order: winter>spring>summer>autumn;(3)the SPI value of each season had obvious spatial difference; in spring, the SPI value in the northeast area of the TGRA showed a decreasing trend, while the SPI value in the southwest of TGRA exhibited an insignificant increasing trend; the SPI value in summer was the opposite of that trend in spring; in autumn, drying trend was more significant in almost the entire TGRA; in winter, the SPI value in the mid-west of the TGRA showed an insignificant decline, while those in the northeast of TGRA presented an insignificant increase;(4)the areas with low drought frequency in spring, summer and autumn mainly distributed in the northeast of the TGRA, while the areas with high drought frequency showed significant spatial differences; the spatial distribution of drought frequency in winter was opposite to that in other seasons; the drought frequency increased gradually in the sequence: spring<summer<autumn<winter;(5)the spatiotemporal distribution of seasonal drought risk in the TGRA generally was medium and relatively low level; the risk levels of spring and summer were generally medium and low, respectively, while those of autumn and winter were medium; the drought disaster risk decreased in the sequence: autumn>spring>winter>summer. These results can provide reference for water resources management and drought risk assessment in the TGRA.

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Last Update: 2020-08-25