One-dimensional numerical simulation of non-uniform sediment transport under unsteady flows |
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| Authors: | Hongwei FANG Minghong CHEN Qianhai CHEN |
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| Institution: | [1]Prof., Dept. of Hydraulic Engineering, Tsinghua Univ., State Key Laboratory of Hydroscience and Engineering,Beijing, 100084, China [2]PhD, College of Water Conservancy and Civil Engineering, China Agricultural Univ., Beijing 100083, China [3]Engineer, Institute of the Yangtze River Research, Wuhan, 430010, China |
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| Abstract: | 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. |
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| Keywords: | One-dimensional numerical model Sediment transport capacity Recovery coefficient Adaptation length Unsteady flow |
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