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所在平台: Udemy |
课程主页: https://www.udemy.com/course/sediment-transport-modeling-using-hec-ras-1d/
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本课程“使用 HEC-RAS 1D 进行泥沙输移模拟”旨在教授学员如何利用 HEC-RAS 1D 模型进行河流泥沙输移的模拟。 课程概要： 河流中普遍存在三种形态的泥沙：推移质、悬移质和冲泻质。自然和人为因素会导致河床或河岸的严重淤积和侵蚀，进而改变河流的地貌形态。泥沙输移受多种因素影响，包括泥沙粒径、流域特征（面积、坡度、河道宽度）、土地覆盖、气候变化和洪水事件。 HEC-RAS 1D 模型作为一种一维数值模型，因其计算简单、所需输入数据少、计算时间短等优点，在模拟长河段的河流动力学和泥沙输移现象方面得到了广泛应用。该模型利用其水力引擎计算出的、跨断面平均的水力性质，结合泥沙连续性方程来计算泥沙输移速率，并据此更新河道几何形态。 HEC-RAS 泥沙模型需要输入文件包括：几何文件（横断面）、流量文件（准非恒定或非恒定流量过程线）、泥沙数据文件（包含床层粒径分布、输沙公式、沉速、泥沙分选方法和边界条件）以及泥沙分析方案文件。 本应用型课程将详细讲解 HEC-RAS 1D 泥沙输移模拟的各个方面，并通过实例应用进行说明。学完本课程后，学员将能够独立地模拟实际工程项目中的泥沙输移过程。
All rivers conveying water contain sediment particles in any of the three forms: bed load, suspended load, and wash load. Natural and human factors trigger rivers to undergo severe deposition and erosion of beds or banks (Joshi et al. 2019). The long-term effects of erosion and sedimentation cause changes in river geomorphological regime. The sediment transport process in rivers depends on several factors including sediment particle size, catchment characteristics (area, basin slope, river slope, and channel width), catchment's land cover, climate changes effects and flood events.To simulate the realistic hydraulic and sedimentation phenomena, several numerical models have been developed over the past decades. Among them, 1D numerical models are still successfully used for long river reaches due to simple computations, small amount of required input datasets, and short computation time (Werner, 2001; Horritt and Bates, 2002; Panin and Jipa, 2002). Due to the high capability of the HEC-RAS 1D model for hydraulic simulation and analyzing the sediment transport process, several companies, engineers, and researchers, all around the world, are using the HEC-RAS 1D model in different projects. Sediment computations in HEC-RAS utilize one-dimensional, cross-section averaged, hydraulic properties from RAS's hydraulic engines to compute sediment transport rates and update the channel geometry based on sediment continuity calculations.An HEC-RAS sediment model requires a geometry file (in 1D case we need cross-sections), a flow file (quasi-unsteady or unsteady flow hydrograph), a sediment data file (including bed gradation, transport function, fall velocity, Sorting method, and boundary conditions), and a sediment analysis plan file. In this applied course, the details of sediment transport modeling in HEC-RAS are described completely with a applied examples. After finishing this course, the user can easily simulate the sediment transport process for each real case study and project.
