Multivariate Frequency Analysis for Streamflow Drought Having Different Time Resolution Using Archimedean Copula Functions

被引:5
|
作者
Sung, Jang Hyun [1 ]
Ryu, Young [2 ]
Chung, Eun-Sung [3 ]
机构
[1] Minist Environm, Han River Flood Control Off, Seoul 06501, South Korea
[2] Natl Inst Meteorol Res, Operat Syst Dev Dept, Jeju 63568, South Korea
[3] Seoul Natl Univ Sci & Technol, Dept Civil Engn, Seoul 01811, South Korea
关键词
Streamflow deficit; Threshold level; Copula function; Return period; EXPONENTIAL-DISTRIBUTION; BIVARIATE DISTRIBUTIONS; HYDROLOGICAL DROUGHTS; DURATION; SEVERITY; RIVER; ORDER;
D O I
10.1007/s12205-022-1634-8
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This study explored return periods of the streamflow deficit characteristics by threshold levels with different time resolutions (daily, weekly, and monthly) using univariate and Copula functions, reflecting hydrological regimes like rapid recoveries from drought and anthropogenic dam operation by monthly basis in South Korea. As a result, the daily-based threshold had a large variability in severities and durations. This is because threshold levels include a large variability of daily streamflow with a small time interval. Joint return periods of duration under extreme droughts were similar to those from univariate frequency analysis. The severities in these extreme droughts were also around the average level, but the duration was relatively long, leading to an increase in the joint return period. This result helps to effectively manage water resource preparing for the assessment on the drought risk with a long duration.
引用
收藏
页码:2013 / 2021
页数:9
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