| Characteristics of daily precipitation with different intensity in the rain-fed area east of the Yellow River of Gansu province |
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| DOI：10.7606/j.issn.1000-7601.2010.06.42 |
| Key Words: daily precipitation with different intensity amount of precipitation precipitation days temporal-spatial distribution tendency |
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| Abstract: |
| According to the Bonsal marginal distribution function, daily precipitation data from 1971~2007 are used and divided into five grades of intensity, i.e., weak, relatively weak, medium, relatively heavy and heavy. These
data are from 13 meteorological stations (with agricultural weather experiment observation also) over the rain-fed area east of the Yellow River in Gansu province. The temporal-spatial distribution and tendency characteristics of various gTades of precipitation are analyzed. The results show that the distnbution of average precipitation days and amount of precipitation are different . The area with the most (least) precipitation days is not the corresponding area along with the highest (low-est) amount of precipitation. The precipitation days of diverse grades of intensity have the most days in weak grade and the least days in heavy grade . The precipitation days of weak grade detemine the average precipitation days . The precip-itation days of heavy grade has the main contribution to the amount of precipitation . The tendency of amount of precipita-tion is more complicated than that of precipitation days. The tendency of precipitation days has the same characteristics in different regions in the study area, but the tendency of amount of precipitation has obvious regional features. The heavy grade precipitation has more intense inter- annual change and greater uncertainty characteristics than those of other intensi-ty grades. |
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