Open AccessTemporal-spatial evolution characteristics of meteorological drought in Guanzhong Basin based on SPEI drought index
Author(s) -
Qiying Zhang,
Wenhao Ren,
Hui Qian,
Panpan Xu,
Meng Guo
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/647/1/012198
Subject(s) - precipitation , evapotranspiration , climatology , structural basin , environmental science , physical geography , geography , ecology , geology , meteorology , biology , paleontology
As the main agricultural area of Shaanxi Province, the Guanzhong Basin has a fragile ecology and frequent droughts. This study focuses on the intensity, duration, and frequency of meteorological droughts in Guanzhong Basin, from 1955 to 2015, and the temporal-spatial characteristics of meteorological drought were evaluated based on the standardized precipitation evapotranspiration index (SPEI). Our results show that the four SPEI values all show a decreasing trend with time, which indicates that the frequency of droughts is gradually increasing. Moreover, the frequency of meteorological droughts does not exceed 40%, with a decreasing order of light drought > moderate drought > heavy drought > extreme drought. The mild drought, moderate drought, severe drought, and extreme drought mainly occur in the eastern, west, south, and north parts of the Guanzhong Basin, respectively.