A Study on the Characteristics of Hydrological and Meteorological Droughts in the Lower Nu River

被引：0
|
作者：
Chen W. [1 ,2 ]
Xu J. [2 ]
Li S. [3 ]
机构：
[1] Institute of International Rivers and Eco-security, Yunnan University, Kunming
[2] School of Resources and Environment, Baoshan University, Baoshan
[3] College of Urban and Environmental Sciences, Peking University, Beijing
来源：
Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2019年 / 55卷 / 04期
关键词：
Climate change; Hydrological drought; Lower Nu River; Meteorological drought;
D O I：
10.13209/j.0479-8023.2019.034
中图分类号：
学科分类号：
摘要：
Taken Mengboluo River, the major tributary in the lower reaches of Nu River as a case, the standard precipitation index (SPI), the standardized precipitation evapotranspiration index (SPEI) and the runoff drought index (SDI) were employed to analyse the change processes of meteorological and hydrological drought based on the monthly precipitation and temperature data of the surrounding meteorological stations from 1966 to 2013, and the monthly runoff of the outlet of the river. The drought indexes value in three reference periods (12 months, 6 months and 3 months) were calculated for each indexes, and the correlation between meteorological and hydrological drought in the basin were also analysed. The results show that there were increasing drought trend, especially, that represented by SPEI-6M and SPEI-3M since 2000s; the drought occurred with multi-scale periodic characteristics. After the mid-90s, the large-scale 25-30 years periodicity gradually moved down to the 10-15 years periodicity. After 2000s, the runoff drought has changed into a weakened drought period over 25 years; but on the mesoscale periodicity with 10-15 years, it is in a transition period from drought to semi humid. Runoff drought is closely related to meteorological drought. Meteorological drought index SPEI-6M could be used to predict annual runoff drought. © 2019 Peking University.
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页码：764 / 772
页数：8
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