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Studies on Wavelet Characteristics of Runoff in the Middle and Lower Reaches of Jinsha River

Author: ChenPeng
Tutor: JiangShiZhong
School: Sichuan Normal University
Course: Physical Geography
Keywords: Jinsha River Run-off Wavelet Analysis Local master cycle
CLC: P333.1
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Based on the measured data of the the 1956-1985 annual runoff of the Jinsha River , the Chinese bomb hydrological stations and the Ping Shan hydrological stations for the inlet and outlet control station , using wavelet analysis , month by month to explore the cyclical changes of the study area over a long period of time sequence , to predict future changes in runoff , the results are as follows : the Jinsha River in southwest Hengduan Mountains , typical of dry and hot valley led to annual internal diameter uneven flow distribution , the flood season , mainly in July to October . Changes in runoff cycle in spring ( April ) for 7a and 16.5a cycle 7a energy oscillation strongest ; summer (May to July ) runoff time series also has a significant cyclical variation , but different In March, the main cycle . June 3a, 5a, 14.5a around the main cycle , cycle 5a oscillation energy is the most powerful . July has only 4a, 9a two main cycles , cycle 9a energy oscillation strongest ; runoff exists in autumn (August to October ) about 5a, 13.5a of change cycle , which cycle 5a energy the strongest oscillation ; runoff time series in winter ( November to January ) about 5a, 14.5a of the main cycle , which the oscillation the 14.5a energy of the primary cycle strongest . The annual runoff exist about 5a, 14.5a of change cycle , which cycle the 14.5a energy oscillation strongest . The study area runoff trends : the annual runoff in the 1992 to 1999 runoff overabundant , from 2000 to 2005 runoff below normal . Spring runoff in the 1991 to 1995 runoff below normal runoff ones from 1996 to 1999 , 2000 to 2002 runoff below normal runoff ones from 2003 to 2005 ; summer runoff in the 1991 to 1993 runoff overabundant and from 1994 to 1996 runoff below normal runoff from 1997 to 1999 overabundant , from 2000 to 2001 runoff below normal , from 2002 to 2004 runoff ones ; fall runoff in the 1990 to 1994 runoff bias Fung, from 1995 to 1998 runoff below normal , from 1999 to 2003 runoff overabundant ; winter runoff in the 1989 to 1997 runoff below normal runoff from 1998 to 2005 overabundant .

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CLC: > Astronomy,Earth Sciences > Geophysics > Hydrological Sciences (water sector physics) > Hydrological analysis and calculation > Water balance
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