基于中位数众数理论的Tennant法改进与应用

在河流生态径流计算中Tennant法应用比较广泛，但其多年平均流量的确定一直是该方法应用的一个难点，以往使用的平均数有时并不能准确反映总体分布的集中趋势，针对这一问题，通过研究实测数据的统计特性，引入中位数及众数理论，对原Tennant法进行改进，有效的去除了极端数据对统计规律的影响，找出了典型流量过程。将其应用在滦河下游生态径流计算中，通过新老方法的比较，认为采用改进后的计算方法得到的结果更加科学合理。该方法具有原理简单、计算过程“透明”等特点，对河流生态环境研究和水资源合理利用具有指导意义。

Improvement and Application of Tennant method Based on median and mode Theory

Tennant method was widely applied on river ecological runoff calculation, but it was very difficult to confirm perennial average flow by this method, the average sometimes did not accurately reflect the central tendency of overall distribution. Therefore, this paper researched statistical character of the practical data and introduces median and mode theory, so as to avoid extreme data effect to statistics by improved Tennant method, and finally found out typical flow process. On the basis of the application on ecological runoff calculation of Luan River downstream and the comaprison between this method and old ones, this paper put forward that the results by this improved method were much more reasonable, that this method took on character of theory simpleness and calculation process clarity, and this method had instructional significance to river ecological environment research and water resources rational use.