首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Research on the drought index of irrigation district with multi-time scales
Authors:Jinping Zhang  Bingtuo Guo  Zhihong Ding
Institution:1. Zhengzhou University, Zhengzhou, Henan Province, 450001, China
4. Institute of Water Resources and Environment, Zhengzhou University, High-tech District, No. 100 Science Road, Zhengzhou, 450001, Henan Province, China
2. Yellow River Engineering Consulting Co., Ltd., Zhengzhou, Henan Province, 450003, China
3. Tianjin Zhongshui Science and Technology Consulting Co., Ltd., Tianjin, 300170, China
Abstract:The empirical mode decomposition method is applied to analyze fluctuating periods and local features of the annual drought index and the drought index in the irrigation and non-irrigation periods from 1956 to 2010 in the Yinchuan irrigation district. In order to understand the uncertainty between these variables, the set pair analysis method is used to present the identity, discrepancy, and contrary of the drought index with multi-time scales. The results reveal that the annual drought index and the drought index in the irrigation and non-irrigation periods have a complex relationship which may be related to El Niño, the air–sea intersection, and the long period of solar activity. The drought index in the irrigation and non-irrigation periods presents mainly the contrary and the discrepancy; the fluctuating shapes of the annual drought index and drought index in the irrigation period are the same on their different period levels. The original annual drought index and its intrinsic mode function components have a certain connection degree; they mainly present the discrepancy.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号