一维河网泥沙输移模式研究  

A STUDY OF SEDIMENT TRANSPORT MODELE IN ONE-DIMENSIONAL NUMERICAL CHANNEL NETWORK MODEL

作　　者：韩冬[1,2] 方红卫[1,2] 陈明洪 何国建[1,2] 白静[1,2] 

机构地区：[1]清华大学水利水电工程系,北京100084 [2]水沙科学与水利水电工程国家重点实验室,北京100084 [3]中国农业大学水利与土木工程学院,北京100083

出　　处：《力学学报》2011年第3期476-481,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家重大专项“水专项”资助(2009ZX07104-001)~~

摘　　要：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.Hydrodynamics and sediment transport model are generally used to simulate the evolution of natural alluvial rivers.In this paper,an explicit recursive method for sediment transport in channel network is presented.Based on hydrodynamic calculation,the method can be used to directly calculate non-equilibrium sediment transport process,involving suspended load and bed-load gradation adjustments one by one node in each river.This method avoids solving the matrix of the relationship between first and last sections,which is popular in traditional methods.A one-dimensional mathematical model with the sediment transport method is applied to the Jingjiang River-Dongting Lake region in the Three Gorges Project.Results are greatly in accord with the actual measurement.Computation cost is reduced and high accuracy is obtained in the new method. Moreover,the differences among different models of suspended load diversion in the node are discussed in the paper.

关 键 词：一维河网水沙数学模型 汊点分沙模式 不平衡输沙 荆江-洞庭湖 

分 类 号：TV143.4[水利工程—水力学及河流动力学]