One-dimensional numerical simulation of non-uniform sediment transport under unsteady flows

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• 作者：Hongwei FANG ; Minghong CHEN ; Qianhai CHEN
• 关键词：One-dimensional numerical model ; Sediment transport capacity ; Recovery coefficient ; Adaptation length ; Unsteady flow
• 刊名：International Journal of Sediment Research
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：23
• 期：4
• 页码：316-328
• 全文大小：527 K

文摘

One-dimensional numerical models are popularly used in sediment transport research because they can be easily programmed and cost less time compared with two- and three-dimensional numerical models. In particular, they possess greater capacity to be applied in large river basins with many tributaries. This paper presents a one-dimensional numerical model capable of calculating total-load sediment transport. The cross-section-averaged sediment transport capacity and recovery coefficient are addressed in the suspended load model. This one-dimensional model, therefore, can be applied to fine suspended loads and to hyperconcentrated flows in the Yellow River. Moreover, a new discretization scheme for the equation of unsteady non-uniform suspended sediment transport is proposed. The model is calibrated using data measured from the Yantan Reservoir on the Hongshui River and the Sanmenxia Reservoir on the Yellow River. A comparison of the calculated water level and river bed deformation with field measurements shows that the improved numerical model is capable of predicting flow, sediment transport, bed changes, and bed-material sorting in various situations, with reasonable accuracy and reliability.