基于非恒定流模型的山洪沟水面线计算

本文将具有良好激波捕捉能力的Godunov格式离散圣维南方程组建立的一维非恒定流模型用于山洪沟水面线的分析计算。首先通过混合流算例验证了该模型具有良好的模拟间断水面和流态过渡的能力,随后将该非恒定流模型用于刘家舍窠山洪沟、梁家岔山洪沟和红花坪山洪沟的水面线计算。分析认为计算结果合理,模型较好地模拟了陡坡和断面变化剧烈情况下出现的急流和流态过渡等问题。该模型在山洪沟水面线的分析计算领域具有良好的工程应用前景。

Unsteady flow model-based calculation of mountain torrent ditch water level

The one-dimensional unsteady flow model established with Saint-Venant equations discretized by Godunov scheme with better shock capturing capability is applied to the calculation of the water level of mountain torrent ditch. At first， it is verified through the calculation made on the case of mixed flow that this model has a better capability for simulating the discontinuous water level and the transition of flow regime， and then the unsteady flow model is applied to the water level calculations made on Liujiasheke Mountain Torrent Ditch， Liangjiacha Mountain Torrent Ditch and Honghuaping Mountain Torrent Ditch. The relevant analysis shows that the calculation result is reasonable， while the torrential flow， flow regime transition， etc.under the conditions of drastic changes of steep slope and section are better simulated by the model. Therefore， this model has a better prospect of engineering application in the field of the analysis and calculation of the water level of mountain torrent ditch.