[1]WU Yan,BAI Jian-qin,ZHANG Xiao-ping,et al.Trend Analysis of Precipitation and Its Erosivity over Last 53 Years Based on the Daily Rainfall in Changwu County[J].Research of Soil and Water Conservation,2012,19(04):38-42.
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Trend Analysis of Precipitation and Its Erosivity over Last 53 Years Based on the Daily Rainfall in Changwu County
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
19
Number of periods:
2012 04
Page number:
38-42
Column:
Public date:
2012-08-20
- Title:
- Trend Analysis of Precipitation and Its Erosivity over Last 53 Years Based on the Daily Rainfall in Changwu County
- CLC:
- P332.1
- DOI:
- -
- Abstract:
- The daily observation data from 1957 to 2009 were used to systematically analyze the trend of precipitation, erosive precipitation and the precipitation erosivity in Changwu County. The results showed that: (1) the mean annual precipitation was 577.8 mm and the erosive precipitation was 340.7 mm, and for precipitation erosivity 1691.2 (MJ·mm)/(hm·h). Their coefficients of variations were 22.5%,34.4%,43.2% respectively. And the proportion of 76.1%, 83.4% and 85.8% concentrated in summer and autumn, 53.2%, 65.5% and 70.1% focused on the period from July to September; (2) over the last 53 years, precipitation and erosive precipitation were detected with an insignificant negative trend and for precipitation erosivity, it was slightly positive trend, the seasonal change patterns among the three elements were similar, for all three elements, there were slightly positive trend both in summer and winter and slightly negative trend both in autumn and spring, for April it was significant negative trend and positive trend for June; (3) the trends of precipitation, erosive precipitation and precipitation erosivity were equally influenced greatly by the change of summer and autumn especially in summer, in monthly scale, by the changes from July to September especially in August. The impact, whatever from two seasons or three months, was intensified gradually among three elements. The results indicated that the changes of three elements differentiated but showed great same phase over the last 53 years.
- References:
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