基于中国山洪水文模型(CNFF)的中小流域洪水频率分析

Flood frequency analysis in small and medium-sized catchments based on China Flash Flood hydrological(CNFF)model

结合暴雨频率分析成果,基于中国山洪水文模型分析了江西省上流流域小流域及分级嵌套流域的洪峰流量频率值。研究表明:中国山洪水文模型在研究区内具有很好的适用性,率定期和验证期的平均径流深和洪峰流量相对误差绝对值分别在12%和7%以内,平均峰现时间误差绝对值均为1.1h,平均Nash-Sutcliffe效率系数分别为0.87和0.90;5年一遇至500年一遇的小流域洪峰流量平均值为78~201 m^(3)/s,分级嵌套流域的洪峰流量分别为104~810 m^(3)/s、125~1041 m^(3)/s、144~1202 m^(3)/s、169~1329 m^(3)/s、181~1436 m^(3)/s、198~1571 m^(3)/s、214~1712 m^(3)/s和231~1889 m^(3)/s。研究成果可为中小流域洪水频率分析及其时空分布规律提供技术支持和参考。

Combined with the results of rainstorm frequency analysis,China Flash Flood hydrological model was used to analyze the flood peak discharge frequency of small catchment scale and hierarchical nested catchments in Shangliu catchment of Jiangxi Province.The results showed that:China Flash Flood hydrological model showed good applicability in study area.During the calibration and validation periods,the absolute values of relative errors of average runoff depth and peak discharge were within 12%and 7%,respectively,the absolute value of average errors of peak occurrence time were 1.1 h,and the average Nash-Sutcliffe efficiency coefficients were 0.87 and 0.9,respectively.The average peak discharge at small catchments were 78~201 m^(3)/s with from 5-year to 500-year return periods.The corresponding peak discharge at hierarchical nested catchments were 104~810 m^(3)/s,125~1041 m^(3)/s,144~1202 m^(3)/s,169~1329 m^(3)/s,181~1436 m^(3)/s,198~1571 m^(3)/s,214~1712 m^(3)/s and 231~1889 m^(3)/s,respectively.The study are expected to provide technical support and reference for flood frequency analysis and spatio-temporal patterns in small and medium-sized catchments.