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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Extreme events, natural variability and climate change : Temporal analysis of hydrological and meteorological factors in the downstream of jinsha river and t...
Temporal analysis of hydrological and meteorological factors in the downstream of jinsha river and the three gorges section of yangtze river
Author : YANG Lu1úČ2,MEI Ya-dong1úČ2,YE Yan3
ABSTRACT: Using mean monthly runoff at 3 gauge stations from 1954 to 2008 as well as precipitation and temperature series at 2 meteorological stations from 1951 to 2008 in the downstream of Jinsha River and the Three Gorges section, this paper investigates tendency of hydrological and meteorological factors with moving average method and Mann-Kendall rank correlation test, and examines mutability and periodicity with sequential clustering analysis, mean value test method and wavelet analysis. In addition, the sensitivity of runoff to precipitation and temperature change is analyzed. The results show that: (1) Distribution of runoff in the study area is highly uneven within a year, while the inter-annual variation is not as significant as inner-annual variation. (2) The annual runoff of gauge stations in the Three Gorges section presents a downtrend and abrupt changes in 1968 and 2005, while precipitation of Shapingba station shows an increasing trend with obviously mutation points in 1961 and 1995. Similarly, runoff of Pingshan station in the downstream of Jinsha River indicates an uptrend and an abrupt change in 1997, meanwhile, precipitation of Yibin station reflects the opposite trend with a mutation point in 1991. Furthermore, temperature in the study area demonstrates an obvious uptrend. (3) Series of runoff, precipitation and temperature all show main cycles less than ten years and secondary cycles over 20 years. (4)Besides, Pearson correlation coefficients implies that runoff of Yichang station is not only in a positive correlation with precipitation, but also in a negative correlation with temperature in Three Gorges section.
File Size : 397,004 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 28/08/2015
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