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现有以α_1 型壅水曲线简易计算法——抛物线法,其基本假定是曲线两端分别与水平线和正常水深线相切。该假定不符合明渠α_1 型水面线的基本水力特征——水面线应以水平线和正常水深线为渐近线。针对这一假定本文提出α_1 型曲线简易计算的新方法——双曲线法,并给出估计坐标原点的近似公式。算例表明本法物理概念清楚、应用简便、计算精度高。
The existing α1 type slug curve simple calculation method - the parabolic method, the basic assumption is that the two ends of the curve tangent to the horizontal line and the normal depth line. This assumption is inconsistent with the basic hydraulic characteristics of open channel α_1 waterline - the waterline should be asymptotically horizontal and normal. In view of this assumption, this paper presents a new method of simple calculation of α_1 curve - hyperbolic method, and gives an approximate formula for estimating the origin of coordinates. The examples show that the physical concept of this method is clear, the application is simple and the calculation accuracy is high.