基于HEC-RAS的梧桐山河流域泥沙输移特性分析

Analysis of sediment transport characteristics in Wutongshan River basin based on HEC-RAS

本文基于HEC-RAS软件建立梧桐山河一维水力学及泥沙输移模型,并利用实测资料对模型进行验证。利用该模型分析河道沿程水面线变化情况及泥沙输移特征。模型泥沙淤积计算表明河道淤积部位主要位于河道转折处及下游出口处,假定无降雨情况下输沙量近似为零,通过模拟计算场次暴雨流域出口断面泥沙输沙量,估算出流域年输沙总量为190.50t。该数学模型可以较好地反映流域内泥沙输移情况,研究成果对于预测梧桐山河流域泥沙淤积状况有重要意义。

In this paper,a one-dimensional hydraulic and sediment transport model of Wutong Mountain River is established based on HEC-RAS software,the model is verified by the measured data.The model is used to analyze the variation of water surface line along the river course and the characteristics of sediment transport.The sediment deposition calculation of the model shows that the siltation part of the river channel is mainly located at the turning point of the river channel and the downstream outlet.Assuming that the sediment transport capacity is approximately zero under the condition of no rainfall,the total annual sediment transport capacity of the river basin is estimated to be 190.50t by simulating the sediment transport capacity of the outlet section of the river basin in each rainstorm.The mathematical model can well reflect the sediment transport in the basin,and the research results are of great significance to predict the sediment deposition in Wutongshan River basin.