“断尾”山洪沟落水洞泄洪能力分析

Analysis on flood discharge capacity in sinkhole of betrunk flash flood gully

喀斯特区域内“断尾”山洪沟泄洪主要依靠沿线落水洞,对落水洞泄洪能力的研究是治理“断尾”山洪沟的关键,同时可为预防和应对山洪灾害提供决策依据。采用熵权法对“断尾”山洪沟落水洞的泄洪能力进行系统分析,为“断尾”山洪沟泄洪能力水文精确计算提供依据。研究表明:以1#-7#号落水洞为研究对象,各落水洞周长、平均直径、平均水深、平均深度为分析指标,通过熵权法分析得出各指标所占的权重分别为22.63%、40.02%、7.94%、29.41%,按其权重计算出各落水洞的过流能力。同理,分析计算7#落水洞的泄洪能力值为68.15 m^(3)/s,大于P=10%的洪水标准为28.20 m^(3)/s,能够满足行洪要求。

In the karst area,the flood discharge of betrunk gully(the small tail-broken mountain valley)mainly relies on the sinkholes along the line.The study of the flood discharge capacity of the sinkholes is the key to the governance of betrunk flood gully,and can provide decision-making basis for the prevention and response of mountain flood disasters.In this study,the entropy weight method is used to systematically analyze the flood discharge capacity of betrunk flood gully,which can provide a basis for the hydrological calculation of flood discharge capacity in the flood gully.Taking No.1 to 7 sinkholes Qiubei county of Yunnan province as the research object,the perimeter,average diameter,average water depth,and average depth of each sinkhole as the analysis indicators.The research shows that:it is concluded that the weight of each indicator respectively is 22.63%,40.02%,7.94%,29.41%through the analysis of entropy weight method.And the flood discharge capacity of each sinkhole according to its weight is calculated.In the same way,the analysis and calculation of the flood discharge capacity of No.7 sinkhole is 68.15 m^(3)/s,which is greater than the P=10%flood standard of 28.20 m^(3)/s,which could meet the flood discharge requirements.