Arid
DOI10.3724/SP.J.1227.2012.00113
Periodical characteristics of baseflow in the source region of the Yangtze River
Qian, KaiZhu; Wan, Li; Wang, XuSheng; Lv, JingJing; Liang, SiHai
通讯作者Qian, KaiZhu
来源期刊JOURNAL OF ARID LAND
ISSN1674-6767
EISSN2194-7783
出版年2012
卷号4期号:2页码:113-122
英文摘要

Baseflow, which represents the drainage of groundwater aquifers, is an essential component of runoff in hydrological basins. In the source region of the Yangtze River, the change of baseflow typically reflects the interactions between groundwater system and climatic factors in cold and arid areas. With modified Kalinen separation method, annual baseflow between 1957 and 2009 in this region was estimated and calculated. In comparison with the inner-annual variations of total streamflow, baseflow showed a weaker fluctuation. Before the 1980s, it was in a steady state; and after then, it demonstrated dramatic variations and large amplitudes. Based on the calculation results of baseflow, the real Morlet wavelet method was applied to reveal the periodical characteristics of baseflow as well as the precipitation and air temperature in the study area. It was found that annual baseflow has a 43-year trend as well as a 21-year period and a 7-year period. The 21-year period is most significant, with its wavelet coefficient having the largest fluctuation and amplitude. Summation of wavelet coefficients on these periods exhibits a similar change pattern with respect to that of annual baseflow. The summation curve takes a "W" shape, which means that the baseflow follows a four-stage sequence of descending-ascending-descending-ascending. As analyzed, the relationship among baseflow, precipitation and temperature is implied in the correlation between their normalized wavelet coefficients at different temporal scales. By the significant positive linear correlations both between precipitation and baseflow (correlation coefficient is 0.98) and between temperature and baseflow (correlation coefficient is 0.90) for the 43-year wavelet coefficients, it is suggested that the long-term increasing trends of precipitation and air temperature will lead to an increasing trend of baseflow. For wavelet coefficients of 21-year and 7-year periods, the positive linear correlation between precipitation and baseflow is significant. However, the correlation between air temperature and baseflow is not so evident, especially for the 21-year period. As a conclusion, correlation analysis with normalized wavelet coefficients showed that the change of annual baseflow was contributed mostly by the change of precipitation and secondly by the change of temperature.


英文关键词baseflow climate Kalinen separation method Morlet wavelet Yangtze River
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000304691500001
WOS关键词WAVELET ANALYSIS ; RECESSION ANALYSIS ; TRANSFORM ; RECHARGE
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/173321
作者单位China Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714
Qian, KaiZhu,Wan, Li,Wang, XuSheng,et al. Periodical characteristics of baseflow in the source region of the Yangtze River[J],2012,4(2):113-122.
APA Qian, KaiZhu,Wan, Li,Wang, XuSheng,Lv, JingJing,&Liang, SiHai.(2012).Periodical characteristics of baseflow in the source region of the Yangtze River.JOURNAL OF ARID LAND,4(2),113-122.
MLA Qian, KaiZhu,et al."Periodical characteristics of baseflow in the source region of the Yangtze River".JOURNAL OF ARID LAND 4.2(2012):113-122.
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