[1]WANG Yongwen,LIU Huiying.Spatio-Temporal Changes of Precipitation in Zhang River Watershed in the Upper Region of Ganjiang Watershed During 1955-2015[J].Research of Soil and Water Conservation,2019,26(04):105-110.
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Spatio-Temporal Changes of Precipitation in Zhang River Watershed in the Upper Region of Ganjiang Watershed During 1955-2015
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 04
Page number:
105-110
Column:
Public date:
2019-06-11
- Title:
- Spatio-Temporal Changes of Precipitation in Zhang River Watershed in the Upper Region of Ganjiang Watershed During 1955-2015
- Keywords:
- Zhangshui River Watershed; areal precipitation; trend analysis; mutation analysis; spatial distribution
- CLC:
- P426.6
- DOI:
- -
- Abstract:
- In order to study the precipitation characteristics of the upper region of Ganjiang Watershed, the precipitation was analyzed to examine the trend and abrupt based observed time series data from 22 available rain gauging stations of Zhangshui Watershed of Ganjiang River from the hydrological bureau of Jiangxi Province for the period 1955—2015. The methods of linear regression, moving average method, Sen’s slope estimator and Mann-Kendall trend test were used. The significance and magnitude of precipitation trends were determined using the non-parametric Mann-Kendall test and Sen’s slope, respectively. Pettitt test was also used to examine abrupt change for precipitation. The average annual precipitation was 1 599.76 mm and the precipitation in spring accounted for 37.32%. The portion of winter precipitation was only 13.05%. The annual precipitation appeared an upward tendency with the rate of 0.17 mm/year. The results also showed that most of precipitation occurred in spring and summer and showed the increasing trend at the rate of 0.65 mm/year and 0.60 mm/year in general, respectively. The precipitation in autumn presented the significant decreasing trend with the magnitude of 1.94 mm/year. The spatial distribution of annual, spring and summer precipitation were insignificant in most stations by M-K test, but significant in the upstream part area only in autumn, especially in the western region. There were 10 stations with significant precipitation increasing trend in winter. The obvious abrupt change points of spring precipitation occurred in the year of 1992 in a few of stations. The mutation points were complex and scattered in the whole region in other three reasons.
- References:
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Last Update:
1900-01-01