Precipitation change in middle and lower reaches of Hanjiang River： Based on wavelet analysis and R/S analysis
Along with global warming,regional precipitation is predicted to make change.As a branch of the Yangtze River,the Hanjiang River has suffered from heavy flood disaster frequently in the past several decades,which caused great damage to local residents and ecosystems,and the dramatic precipitation change was thought to be the main driving force.Therefore,it is of great importance to conduct studies on the trend and period of precipitation so as to take measures to prevent flooding.Integrating the precipitation data during 1961-2006 from nine weather stations in middle and lower reaches of Hanjiang River,this paper analyzed the periodicity characteristics and changing trend of precipitation in the study area by the methods of Morlet wavelet analysis and R/S analysis（Rescaled Rangle analysis）.The results of the wavelet analysis showed that,all the nine weather stations had quasi-periods of 5 years（short period） and 10-15 years（mid-long period）.And a few of the stations,such as Wuhan,Tianmen and Zhongxiang,might have a quasi-period of 40 years,which needs a longer time series to prove.Considering the assured periods,the stations of Wuhan,Fangxian and Laohekou took the short period as the main period,with the others for the mid-long period.The results of R/S analysis showed that there was obvious HURST PHENOMENON in the time series of regional precipitation,which would be consistent with the changing trend of precipitation after the study period.
wavelet analysisR/S analysismiddle and lower reaches of Hanjiang Riverprecipitation time series
NETL
NSTL
万方数据
维普
