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推导了一种显式的河网泥沙输移递推计算方法,该方法在水动力学计算结果所确定的汊点类型基础上,直接计算每个河段中逐个节点的不平衡泥沙输沙过程以及悬沙和床沙的级配调整,克服了传统方法中必须通过首末断面含沙量关系确定河网悬沙矩阵求解的困难.将该泥沙输移模式的一维河网水沙数学模型,应用于长江三峡下游荆江-洞庭湖河网区域,并取得了较好的计算结果.在模型验证之后,进一步讨论了采用新的泥沙输移计算模式和原有泥沙输移计算模式在计算时间上和计算内容方面的差别.
An explicit recursive calculation method of sediment transport in river network is derived. Based on the type of 汊 point determined by hydrodynamic calculation, this method directly calculates the imbalance sediment transport of each node in each river section Sand process and gradation adjustment of suspended sediment and bed sand to overcome the difficulty of solving the suspended sediment matrix of riverbed through the relationship between the initial and the final sediment concentration in the traditional method. Sand mathematical model is applied to the Jingjiang-Dongting Lake river network in the lower reaches of the Three Gorges of the Yangtze River and good results are obtained.After the model verification, the paper further discusses the new sediment transport calculation model and the original sediment transport The difference between the calculation mode and calculation content.