根据复杂山区地形的特点，以箱模式为基础，引入地形修正系数，建立梯形模型。

Echelon model was built based on the box model and imported modified terrain coefficient, according to the characteristic of mountainous area.

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本文提出了一条求解小底坡梯形明渠临界水深的新途径——预估修正法。

This paper presents a new way, i. e., a advance estimate modified method, for calculating critical water depth of open channel with trapezoid section and smooth slope.

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