Based on the data of the annual runoff from 1953 to 2004 obtained at Xiaodeshi Hydrological Station located at the Mid Jinshajiang River and the monthly mean precipitation data from 1953 to 2004 got from Yibin Hydrological Station, the frequency of higher and lower runoff in Lower Jinshajiang River is analyzed herein with the joint distribution of both the precipitation and runoff constructed with Copula function. The result shows that the precipitations and runoffs within all the quarters are accorded with the Person type Ⅲ distribution and the joint distributions of the precipitations and runoffs within all the quarters can be better fitted by Clayton Copula function; while the frequencies of abundant water of all the quarters are 14. 08%、18. 11% ? 12. 32% 、13. 01% respectively and the corresponding dry frequencies are 15. 51%、18. 78%、14. 16%、15. 48% respectively. The study mentioned above can not only lay a scientific basis for the reasonable allocation and control of the water resources of the Lower Jinshajiang River, but can also build a foundation for the further risk assessment.
Pearson Ⅲ distributionCopula functionrunoffprecipitationfrequency of higher and lower runoffLower Jinshajiang River
国家科技期刊平台
NSTL
万方数据
维普
