热带岛屿南渡江洪水归槽影响下防洪能力分析

发布时间：2018-07-21 09:35

【摘要】：流域内修建堤防可以抵御洪水侵害,但堤防修建易引发洪水归槽,导致用于洪水灾害风险评估的洪水序列失去一致性,防洪堤的防洪能力受到影响。采用水文变异诊断系统和变化环境下基于小波分析的非一致性水文频率计算方法,结合南渡江三滩站1956-2013年的实测年最大流量序列,对受归槽洪水影响下南渡江的堤防防洪能力进行分析。结果显示,洪水归槽影响下,引起下游断面涨水过程和洪峰流量增大、水位增高,洪水发生的频率和量级发生了较大的变化,南渡江上游龙州河堤防的防洪能力有所降低。当安全超高在1.0~2.0 m变化时,其堤防可以抵御的洪水标准从过去条件下的10~18年一遇,降到现状条件下的3~6年一遇。
[Abstract]:The construction of embankment in the basin can resist flood damage, but the construction of embankment can easily lead to flood return channel, which leads to the loss of consistency of flood sequence used in flood hazard risk assessment, and the flood control capacity of flood prevention embankment is affected. Using the hydrological variation diagnosis system and the non-uniform hydrological frequency calculation method based on wavelet analysis under the changing environment, combined with the measured annual maximum discharge series of Santan station in Nandujiang River from 1956 to 2013, The flood control capacity of the embankment in Nandujiang River under the influence of return channel flood is analyzed. The results show that under the influence of flood return channel, the process of rising water and Hong Feng discharge of downstream section are increased, the water level is increased, the frequency and magnitude of flood occurrence have changed greatly, and the flood control capacity of Longzhou River embankment in the upper reaches of Nandu River has been reduced. When the safety superelevation is 1.0 ~ 2.0 m, the flood standard of its embankment can be withstood from 1018 years to 3 ~ 6 years under the present condition.
【作者单位】：海南省水文水资源勘测局;海南大学环境与植物保护学院;海南大学旅游学院;
【基金】：水利部公益性行业科研专项经费项目(201401048) 海南省自然科学基金项目(414192,20164157) 国家自然科学基金项目(51569009,51210013,51509127) 海南省中西部高校提升综合实力工作资金项目(ZXBJH-XK004,ZXBJH-XK005) 海南大学科研启动基金项目(kyqd1417)
【分类号】：TV122;TV87

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