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| Characteristics of precipitation and soil erosive rainfall in Changwu Loess Plateau-gully Region |
| Chen Jie,Liu Wenzhao,Wang Wenlong,Li Zhi |
| Northwest A & F University,Institute of Soil and water Conservation,CAS & MWR,712100 Yangling,Shaanxi,China |
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Abstract The monthly and annual distribution characteristics of precipitation as well as the probability distribution of annual precipitation were studied,utilizing the daily precipitation from 1957 to 2006,data of which supplied by the Changwu Meteorological Station.The results demonstrate that the distribution of monthly precipitation is variable,and mainly concentrated in July,August,and September.The total annual precipitation varied greatly from year to year.The annual variation of precipitation is larger than the annual variation of rainy days.Analysis of the soil erosive rainfall showed that the highest occurrence of rainfall happened in July and August.The times of rainfall that amounts of rainfall less than 30 mm were more than others.As to single soil erosive rainfall,the rainfall intensity reduced along with the rainfall amount increasing.Meanwhile the times of rainfall duration within 30 min are more than that over 30 min.
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Received: 12 April 2008
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