考虑推悬运动特性的全沙数学模型

A mathematical model for total sediment transportconsidering different characteristics betweenbed load and suspended load

本文分析了推移质和悬移质的运动形式、运动区域、运动规律、能量来源、挟沙能力及其计算公式、造床作用大小、断面冲淤分布、冲淤同步性、孔隙率、泥沙级配的计算方法以及实测资料所提供的初始边界条件等的不同，提出一个考虑推移质和悬移质不同运动特性的一维全沙数学模型．其建模的基本思路是：在水流部分计算之后，将程序分两个循环，采用各自的计算方法，分别计算推移质和悬移质在同一水流条件下的上游来沙量、水流挟沙能力、断面实际输沙量、断面冲淤面积、新时段泥沙级配、冲淤厚度的横向分布、泥沙孔隙率，然后将它们的冲淤厚度按其非孔隙部分为权进行迭加，作为总冲淤厚度．本文还提出了悬移质冲淤厚度横向分布公式、总冲淤厚度迭加公式．本模型的计算结果与重庆两江汇合口河工模型试验成果进行了比较，符合程度较好．

Analysed the differences of forms,areas, laws,energy sources of motion,calculating formulas of sediment-carrying capacity,effect on bed, lateral distribution and synchroinsm of alluviation,porosity,methods of determining sediment composition, and initial and edge conditions between bed load and suspended load,a total sediment transport mathematical. model for considering different characteristics between both loads is established in this paper.The basic idea of themodeling is that the program is divided into two circulations and each computing method is usedto determine oncoming sediment,sediment carrying capacity,actual sediment discharge,areas ofscouring and deposition,sediment composition at new time step,lateral distribution of alluviation, porosity of bed load and suspended load respectively,then under the same condition of flow,the both loads'sizes of scouring and deposition are superposed as total sizes of alluviation withno-poresection weight. It is in good agreement as compared with the results of physical model.