| Analysis on coincidence characteristics of high and low streamflow in Central Shaanxi based on Copula function |
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| DOI：10.7606/j.issn.1000-7601.2013.04.043 |
| Key Words: water resource river runoff high and low streamflow Copula function |
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| Abstract: |
| Taking the mainstreams of Weihe River, Jinghe River and Heihe River in Central Shaanxi as examples, the coincidence relationship of high and low streamflow among different rivers was analyzed with Copula function. The results showed that the synchronous frequency of normal flow year was the highest, that of low flow year was the next, and that of high flow year was the lowest. As far as the asynchronous frequency of flow was concerned, the frequency of high-normal and normal-high flow, high-low and low-high flow, and normal-low and low-normal flow of two rivers was coincident approximately. The synchronous frequency (of 3 types) was higher than the asynchronous frequency (of 6 types) for the three rivers. The Copula function method is not only simple and convenient but also clear and applicable for analyzing the coincidence relationship of streamflow among rivers. |
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