| Study on characteristics of precipitation and runoff changes in the Shitouhe watershed |
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| DOI：10.7606/j.issn.1000-7601.2011.06.33 |
| Key Words: precipitation runoff Mann-Kendall test analysis of spectrum non-uniformity coefficient concentra-
tion period Shitouhe watershed |
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| Abstract: |
| Studying characteristics of precipitation and runoff changes could offer a scientific support for planning
and using water resources more resonable. Mann Kendall test and analysis of spectrum are used to study the characteris-tics of precipitation from 1954~2007 and runoff series from 1950~2008 in Shitouhe watershed. The annual distribution of precipitation and runoff is analyzed with non uniformity coefficient and concentration period . The results show that: the annual precipitation and runoff declines significantly; the aberrance points of precipitation appear in 1979 and 1990, while the annual runoff aberrance points in 1969 and 1995; the precipitation and runoff have the main cycle of about 3 years，and the study on non-uniformity coefficient and concentration period got the same conclusion. |