南水北调与水利科技2018，Vol.16Issue(1)：114-121,8.DOI:10.13476/j.cnki.nsbdqk.20180018
渭河华县段漫滩洪水变异特征及其生态效用探析
Change in overbank flood at Huaxian Section of the Wei River and its potential impact on riparian ecosystem
摘要
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 varia-tion of the overbank flood time series and discussed its potential impact on the riparian ecosystems.The results showed that the over-bank 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 overbank floods were mostly small floods due to flow reduction and sediment deposition in the lower reaches of the Wei River,and they had slo-wer flow speed,smaller quantity,and limited ecological effects.Meanwhile,the evaluation results by RVA showed the frequency and du-ration of the overbank floods at Huaxian section both changed significantly,which would pose great potential threat to the riparian envi-ronment.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.关键词
漫滩洪水/演变规律/ToB/Pettitt检验/变化范围法/渭河流域Key words
overbank flood/evolution law/top of bank/Pettitt test/RVA method/Wei River basin分类
天文与地球科学引用本文复制引用
张洪波,南政年,余荧皓,李吉程..渭河华县段漫滩洪水变异特征及其生态效用探析[J].南水北调与水利科技,2018,16(1):114-121,8.基金项目
国家自然科学基金(51379014) （51379014）
陕西省科学技术研究发展计划(2014KJXX-54) （2014KJXX-54）
中央高校基本科研业务费专项资金(310829152018)National Natural Science Foundation of China(51379014) （310829152018）
Shaanxi Science and Technology Research and Development Plan(2014KJXX-54) （2014KJXX-54）
Special Funds for Basic Scientific Research in Central Universities(310829152018) （310829152018）
