对传统的T ennant 法进行改进, 从原方法中确定多年平均年流量系列中找一典型年, 要求典型年的年流量最 接近多年平均流量, 典型年来自河流本身一年流量过程, 因而具有河流本身的季节丰枯特性。用典型年流量来代替 多年平均流量, 从而实现T ennant 法反映河流流量的季节性。改进后的应用结果表明, 求得的湟水干流和大通河的 河道内生态环境需水流量更好地体现了研究河段流量丰枯的季节性。

In this pa per, the t raditio nal T ennant method was improv ed. Based on t he or ig inal metho d, a t ypical year in the av erag e annual flow ser ies of many years was selected, w hich r equired that the flow in the ty pical y ear is clo se to the av erag e annual flow of many y ear s. For t he ty pica l year cho sen fr om the river flow process, it has the seasonal w etness and dry ness char acter istics. Use o f river flow in a typical y ear instead o f the av erage annual flow in Tennant method can reflect the seasonal characterist ics of r iver flow . T he results show ed that the eco2environmental water r equirement calculated by the improv ed metho d bet ter re2 flect s the seasonal w etness and dry ness char acter istics in the main str eam of Huangshui Riv er and all reaches of Dato ng Riv er.