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文中对作者原提出的分析一维河流水团示踪试验数据，确定河流纵向弥散系数Ｄ和河流平均流速的直线图解法进行了改进。与直线图解法相比较，改进方法具有：１）．在示踪剂一级反应速率常数Ｋ１为未知的情况下仍可以应用，进一步拓宽了水团示踪试验的适用范围；２）．在原始数据处理过程中，避免了计算浓度的差商值，可能会提高参数计算结果的精度等特点．
In this paper, we improved the straight-line graphical method of analyzing the experimental data of one-dimensional river water mass tracing proposed by the author and determining the longitudinal dispersion coefficient D and the average flow velocity of the river. Compared with the straight line method, the improved method has the following: 1). The tracer primary reaction rate constant K1 is still unknown when the case can be applied to further broaden the scope of application of water tracing test; 2). In the process of the original data, the difference between the calculated concentration and the quotient is avoided, and the precision of the parameter calculation result may be improved.