One-dimensional Numerical Model of Cohesive Sediment Transport in Open Channel Flow
One-dimensional Numerical Model of Cohesive Sediment Transport in Open Channel Flow
复制标题
明渠流中粘性泥沙输运的一维数值模型
DOI：
--
复制
发表时间：
2010
影响因子：
1.2
通讯作者：
M. Kouchakzadeh
中科院分区：
文献类型：
--
作者：
J. Samani;H. Samani;M. M. Halaghi;M. Kouchakzadeh
粘性泥沙输运一直是水利工程师在涉水工程中经常遇到的一个复杂问题。这主要受水沙系统宏观特征的影响。本文建立了一个一维数学模型，用于预测侵蚀和沉积同时条件下的粘性泥沙输运。该模型以对流扩散方程为基础，采用合适的源汇项和色散系数。用有限体积法求解了模型中建立的方程。利用室内实验数据，采用优化技术对模型进行了标定。为了优化，采用了变换后的鲍威尔方法。数据是在长10米、宽0.30米、高0.45米的水槽中收集的。施加的流量和浓度分别在3 ~ 5lit/sec和7 ~ 15lit /sec -1之间。使用两个数据集评估了该模型的性能：一组是本研究获得的，另一组是由其他研究人员提供的。该模型与两组数据吻合良好。结果表明，泥沙淤积和侵蚀是水流浓度、水流深度和施加在河床上的剪应力的函数。
Cohesive sediment transport remains a complicated subject that hydraulic engineers are frequently faced with in water-related engineering problems. This is primarily affected by the macroscopic aspects of water-sediment system characteristics. In this paper a 1-D mathematical model was developed to be employed in predicting the cohesive sediment transport under simultaneous conditions of erosion and deposition. This model is based on the convection-diffusion equation with proper source and sink terms and dispersion coefficient. The equation developed in the model has been solved by applying the finite volume approach. The model has been calibrated by employing the optimization technique using laboratory experimental data. For optimization, the transformed Powel's method has been employed. The data were collected in a flume of 10 m length, 0.30 m width and 0.45 m height. The applied discharges and concentrations were between 3 to 5lit/sec and 7 to 15 lit sec -1 , respectively. The performance of this model has been assessed using two data sets: a set obtained in this study, and another provided by other researchers. The model shows good agreement with both data sets. The results obtained suggest that the deposition and erosion are functions of flow concentration, flow depth and shear stress exerted on bed.