|
|
|
| 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.
|
|
Received: 29 April 2018
|
|
|
|
| [1]YAO J, ZHAO Y, CHEN Y, et al. Multi-scale assessments of droughts: a case study in Xinjiang, China[J]. Science of the total environment, 2018, 630:444.[2]HUANG S, HUANG Q, CHANG J, et al. The response of agricultural drought to meteorological drought and the influencing factors: a case study in the Wei River Basin, China[J]. Agricultural water management, 2015, 159(159):45-54.[3]韩志慧,刘小刚,郝琨,等.基于SPI指数的内蒙古地区干旱演变特征及趋势预测[J].排灌机械工程学报,2017,35(5):430-439. HAN Zhihui,LIU Xiaogang,HAO Kun,et al. Drought evolution characteristics and trend prediction in Inner Mongolia based on standardized precipitation index[J]. Journal of drainage and irrigation machinery engineering,2017,35(5): 430-439.(in Chinese)[4]肖名忠,张强,陈晓宏.基于多变量概率分析的珠江流域干旱特征研究[J].地理学报,2012,67(1):83-92. XIAO Mingzhong, ZHANG Qiang,CHEN Xiaohong. Spatial-temporal patterns of drought risk across the Pearl River Basin[J]. Acta geographica sinica,2012,67(1):83-92.(in Chinese)[5]WANG Lin,CHEN Wen,ZHOU Wen,et al. Drought in Southwest China: a review[J]. Atmospheric and oceanic science letters,2015,8(6): 339-344.[6]安顺清,邢久星.帕默尔旱度模式的修正[J].气象科学研究院院刊,1986,1(1):75-82. AN Shunqing,XING Jiuxing. The modification of palmer drought severity model[J]. Journal of academy of meteorological science,1986,1(1): 75-82.(in Chinese)[7]李忆平,李耀辉.气象干旱指数在中国的适应性研究进展[J].干旱气象,2017,35(5):709-723. LI Yiping,LI Yaohui. Advances in adaptability of meteorological drought indices in China[J]. Arid meteorology,2017,35(5): 709-723.(in Chinese)[8]赵明汉,邵东国,尹希,等.灌区干旱指标适用性比较及干旱特征分析[J].中国农村水利水电,2016(8):167-170. ZHAO Minghan,SHAO Dongguo,YIN Xi,et al. Applicability of drought index and analysis of drought characteristics in irrigation region[J]. China rural water and hydropower,2016(8): 167-170.(in Chinese)[9]陈少勇,郭凯忠,吴芳蓉,等.中国南方冬季降水异常的时空分布特征分析[J].气候变化研究快报,2014,3(4):165-175. CHEN Shaoyong,GUO Kaizhong,WU Fangrong. Analysis of the spatial and temporal characteristics of the winter precipitation in Southern China[J]. Climate change research letters,2014,3(4):165-175.(in Chinese) |
|
|
|
