基于Tennant改进法的讨赖河生态流量分析与评价

Analysis and Evaluation of Ecological Flow of Taolai River Based on Improved Tennant Method

基于冰沟水文站、鸳鸯池水库站的长序列水文资料,通过Tennant法、中位数改进法和众数改进法对比分析,最终确定了讨赖河干流在一般用水期和用水高峰期的生态流量,同时对现状水平年的生态下泄流量进行对比评价。结果表明:①冰沟水文站用水高峰期生态流量为2.332 m^3/s,一般用水期为1.258 m^3/s;而鸳鸯池水库站用水高峰期生态流量为0.989 m^3/s,一般用水期则为0.778 m^3/s;②现状水平年(2016年)冰沟水文站、鸳鸯池水库站的用水高峰期和一般用水期月平均流量均可达到相应生态流量的最佳范围;③2016年,冰沟水文站在一般用水期生态流量达到最佳生态流量的天数为181 d,鸳鸯池水库站的一般用水期生态流量达到最佳生态流量的天数为137 d,达到极好生态流量的天数为19 d,达到好的生态流量的天数为22 d。因此,冰沟水文站、鸳鸯池水库站均可基本满足河道一般用水期的生态流量。

Based on the long series hydrological data of Binggou Hydrological Station and Yuanyangchi Reservoir Station,through the comparative analysis of Tennant method,median improvement method and mode improvement method,the ecological flow of the Taolai River in the general water use period and peak water use period is finally determined,and the ecological discharge flow in the current level year is compared and evaluated.The results show that:①The peak ecological flow of Binggou Hydrological Station is 2.332 m^3/s,and the general water use period is 1.258 m^3/s;while the peak ecological flow of Yuanyangchi Reservoir Station is 0.989 m^3/s,and the general water use period is 0.778 m^3/s;②In the current level year(2016),the average monthly flow of Binggou Hydrology Station and Yuanyuangchi Reservoir Station can reach the optimal range of corresponding ecological flow in the peak period of water use and the general water use period.③In 2016,the number of days when the ecological flow of Binggou Hydrology Station reached the optimal ecological flow in the general water use period was 181 days,the number of days when the ecological flow of Yuanyangchi Reservoir Station reached the optimal ecological flow in the general water use period was 137 days,the number of days when the ecological flow reached the excellent ecological flow was 19 days,and the number of days when the ecological flow reached the good ecological flow was 22 days.Therefore,Binggou Hydrology Station and Yuanyangchi Reservoir Station can basically meet the ecological flow during the general water use period of the river.