示踪实验确定河流纵向离散系数的单纯形加速法

应用单纯形加速法结合实例求出福建闽江干流富屯溪洋口段纵向离散系数ＤＬ＝２．６２ｍ＾３／ｓ。研究结果表明，该法用于估计非线性模型参数优于“非线性逼近法”。由于单纯形法寻优过程不需要计算目标函数的偏导数，不受模型复杂程度的限制，因而计算简便，可广泛应用于环境，生态模型的拟合和参数估计。

Accelerated Simplex Algorithm to Determine the Longitudinal Dispersion Coefficient in a River by Tracer Tast

The accelerated simplex alsorithm has been used tocalculate the longitudinal dispersion coefficient in ariver,as an example for which the Ynagkou reachesof the Futunxi River,a mainstream of the MinjiangRiver in Fujian province, was found to have alongitudinal dispersion coefficient D2 of 2.62 m2/s.The results show that the accelerated simplexalgorithm was more effective to be used forevaluating the parameters for a nonlinear model thanthe nonlinear approach algorithm.This was simplybecause the accelerated simplex algorithm had aprocess of optimization in which it was not necessaryto calculate the partial derivative of the goalfunction and was not limited by the complexity of amodel so that it was easy to be calculated and widelyapplicable. This algorithm could be widely used to fitenvironmental and ecological models and to makeparameters evaluation.