孟加拉国布河河道泥沙数学模型计算中几个问题的探讨

针对布河游荡性河道上支汊众多、主流摆动不定、河道防洪能力较差等特性,基于断面输水和输沙相等的概念,将布河宽浅多汊的河道断面合并为等量的单一河道;在分析比较的基础上,确定了部分年份所缺的水沙资料,利用一维非均匀悬移质不平衡输沙数学模型进行验证计算,结果表明计算值与实测值相符较好.在此基础上,作了布河整治方案计算.对一些影响计算结果的因素进行了敏感性分析,指出了其中一些较为敏感的影响因素.

Calculation Results and Sensitivity Analysis of Channel Deformation on the Brahmaputra River in Bangladesh

Some characteristics of a mathematical model simulating the channel deformation of the Brahmaputra River in Bangladesh are described, Under the assumption that the water conveying and sediment carrying capacities in prototype and normalized channels are equal, a single equvialent channel is adopted as a calculating section. Based on analysis and comparison of measured data, some sedimet missing datum are determined. The calculation results of the model agree well with the deformation of the river channel observed during 1965-1989. Then, river channel deformation under different regulations schemes is predicted. Finally, the sensitivity analysis is carried out, and some sensitive factors are pointed out.