ELCIRC河口模型优点之一是水平法向速度的全导数采用逆向追踪计算。这种欧拉-拉格朗日模拟必须采用精确的追踪算法。就ELCIRC现有模型中插值方法的双线性映射误差进行了一定的讨论，给出另外一种较为简化的迭代算法。通过弯道水槽算例分析可知，迭代算法在计算精度和计算有效性上与原有的程序基本一致。
The numerical algorithm of ELCIRC (Eulerian Lagrangian CIRCulation) has an important advantage: the total derivatives of the horizontal normal velocity are discretized using Lagrangian back tracking. The use of accurate tracking algorithms is strongly recommended for this Eulerian Lagrangian simulation. Tracking errors in inverse bilinear mapping for quadrangles is discussed and a more simple iterative method is recommended. A calculation example of bend flume shows that this iterative method has the same accuracy and computational efficiency with the original method.
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