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| Calculation method of mean rainfall amount of river basin in the Hilly-gully region of Loess Plateau of Northern Shaanxi Province |
| Wang Lina1，2,Mu Xingmin3,4,Zhang Xiaoping3,4,Li Yan5 |
| 1.Center for Water Resources and Environment Sun Yat-sen University,510275, Guangzhou;2.Guangdong Province Key Lab.of Coatal Ocean Engineering,510275,Guangzhou;3.Northwest A&F University,712100,Yangling,Shaanxi;4.Institute of Soil and Water Conservation,The Chinese Academy of Sciences,Ministry of Water Resources,712100,Yangling,Shaanxi;5.Department of Tourism and Environment,Guangdong University of Business Studies,510320,Guangzhou:China |
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Abstract It is crucial to calculate method of areal precipitation and the selection number of rainfall station` for mean precipitation in a river basin.The data about respective rainfall station of Kuye,Tuwei,Jialu River Basin,which located in the Hilly-gully region of Northern Shaanxi Province within the period of 1981 to 1986 were used as rainfall data relatively put together.Using Taisen polygon to calculate area mean rainfall as reference values.Analysing the relationship between maximal proportional error absolute value and the number of rainfall station by using arithmetic average law under various rainfall station combination condition.Conclusion as follow: in the river basin,increasing the number of rainfall station,maximal proportional error absolute value seems to be the decrease trend.In Kuye river the proportional error absolute values,between the calculated area mean rainfall value which accord to selecting 9 rainfall stations in Upper,Middle and Lower river,and reference values,are all within 10%.With the same method,Tuwei river's and Jialu river's the proportional error absolute values are 5 percent.This research technique has provided the method which is how to deal with the individual rainfall station data lacks,in the rainfall material limited situation and in research precision scope.This paper also displayed the simple feasible method and the theory basis.
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Received: 04 July 2007
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