嘉陵江入汇对重庆河段水力特征影响的水力学分析

Hydraulic Analyses of the Effect of Inflow ofJialing-Jiang on Flow Characteristics ofChongqing Reach

本文着重从水力学分析的方法来探讨嘉陵江水流入汇对重庆河段的影响.水力学分析方法能够为类似于嘉陵江入汇长江干流的问题提供较为通用的计算方法;在提供计算结果的同时也使得对问题本身的物理实质或机理有一深入认识.在文中,除对自然状态下嘉陵江入汇问题进行分析外,还将三峡建库后在不同水库运用方式下嘉陵江入汇对重庆河段影响的试验及计算结果作了比较.文中提供的方法可以弥补通常采用的水文统计法的一些不足之处,也可用来检验后者在分析问题时的合理性.

The hydraulic analysis method for the flow characteristics in a river junction is introduced in connection with the example of the inflow of Jialing-Jiang into Yangtze River, instead of the traditional hydrologic method. In this way, a theoretical explanation of the previous reasonable qualitative relations among the hydraulic parameters or the empirical formulas based on the hydrologic statistical method is given, meanwhile the shortcomings in the previous method are also indicated. The analyses show that the present model can also be used for the estimation of the effect of the different operation plans of the downstream reservoir on parameters in the river junction, if all the relevant factors are counted in the determination of the significant parameter β3. All the calculation results agree very well with the measured data.