Change in overbank flood at Huaxian Section of the Wei River and its potential impact on riparian ecosystem
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Abstract:
In this paper, we investigated the overbank flood at the Huaxian section of the Wei River. First, we employed the top of bank (ToB) method to calculate the overbank flood level corresponding to different historical large profiles, and employed hydraulic methods to calculate the frequency, duration, and maximum flow of overbank floods at Huaxian section from 1965 to 2010. Moreover, with the frequency and duration of overbank floods as evaluation indexes, we used the range of variability approach ( RVA ) to evaluate the variation of the overbank flood time series and discussed its potential impact on the riparian ecosystems. The results showed that the overbank flood occurred 34 times at the Huaxian section of the Wei River in 1965-2010, that is 0.74 times a year. The frequency, duration, and maximum flow of overbank floods all showed a significant decreasing tendency over time. Especially since the 1990s, the over bank floods were mostly small floods due to flow reduction and sediment deposition in the lower reaches of the Wei River, and they had slower flow speed, smaller quantity, and limited ecological effects. Meanwhile, the evaluation results by RVA showed the frequency and duration of the overbank floods at Huaxian section both changed significantly , which would posegreat potential threat to the riparian environment. Thus, we suggest that the administration should take more measures such as artificial overbank floods to protect the ecological balance and security of riparian wetlands and beaches.
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