Analysis of characteristics of seasonal drought in Southern China—a case study of Zhanghe Irrigation District
CHEN Mengting1, LUO Yufeng1,2, YAN Chenegming1,3, LUO Hongying2, CUI Yuanlai1
1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan, Hubei 430072, China; 2.School of Civil and Hydraulic Engineering, Xizang Agriculture and Animal Husbandry College, Linzhi, Tibet 860001, China; 3.Department of Water Resources Engineering, Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou, Guangdong 510925, China
Abstract：In order to study the characteristics of seasonal drought in Southern China, the daily meteorological data in Zhanghe Irrigation District from 1953 to 2016 was utilized to calculate three kinds of drought indexes, i.e. standardized precipitationindey(SPI), relative moisture(M)and Palmer drought severity index(PDSI), and against the actual drought information, the seasonal drought characteristics were analyzed. The results show that the three drought indexes have their own advantages in different aspects. From the degree of coincidence, SPI has the highest matching rate with actual drought. From the perspective of different durations of drought, SPI and M respond quickly to short-term drought, while PDSI is more sensitive to long-term drought. In terms of season, M is suitable to spring and summer and SPI is suitable to autumn, while PDSI is better to winter. The characteristics of seasonal drought in Zhanghe Irrigation District are as follows: single-seasonal drought is more frequent and lighter than multi-seasonal drought. Among the single-seasonal droughts, the frequency of summer drought is the highest, followed by autumn drought and spring drought, and the winter drought is the least. Summer and autumn droughts are of high level and more harmful. Among the multi-seasonal droughts, summer-autumn drought appears most frequently and has the highest drought level. The autumn-winter drought and spring-summer drought are less, and the spring-summer-autumn drought is the least. Compared with Northern China where the drought is closely related to precipitation, the drought in Southern China is less dependent on precipitation, especially it often occurs in summer and autumn even with more precipitation. The underlying mechanism for this effect is more complicated.
陈梦婷, 罗玉峰,, 晏成明,, 罗红英, 崔远来. 南方季节性干旱特征分析—以湖北漳河灌区为例[J]. 排灌机械工程学报, 2018, 36(9): 863-868.
CHEN Mengting, LUO Yufeng,, YAN Chenegming,, LUO Hongying, CUI Yuanlai. Analysis of characteristics of seasonal drought in Southern China—a case study of Zhanghe Irrigation District. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 863-868.
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