中文摘要：

为提高线性变截面梯形渠道非恒定流计算的精度，降低计算工作量，从明渠非恒定流的基本微分方程出发，推导出线性变截面梯形渠道非恒定流计算的特征线法．并通过算例证实了该方法的有效性．

英文摘要：

In order to enhance the calculation precision of unsteady flow in open channel with linear variable trapezoidal cross-section and reduce the calculation workload, based on the basic partial differential equations of unsteady flow in open channel, the method of characteristics for calculation of unsteady flow in channel with linear variable trapezoidal cross-section is derived in this paper, the effectiveness of which is confirmed by computational examples.