基于MIKE 11模型的鹅头分汊型河道水面线及分流比计算

Calculation on Water Surface Line and Divergence Ratio of Goose-head Bifurcated River Based on MIKE 11 Model

分汊型河道是冲积平原河流中常见的一种河型,研究分汊型河道的水面线及分流比对于在分汊型河道上设计涉水工程具有重要的意义。本文以汉江襄阳鱼梁洲河段为例,根据2015年实测固定断面和2011、2017年实测洪水调查资料,采用MIKE 11一维水动力模型对鹅头分汊型河道的水面线及分流比进行了研究,结果表明:各级不同来水条件下,汉江鱼梁洲左、右汊分流比较稳定,总体变化不大;随着干流总来水流量增大,汉江左汊的分流比随之增加。

Tiller channels are a common type of rivers in alluvial plains. It is of great significance to study the water surface line and the diversion ratio of the Tiller channels for designing wading projects on the branch channels. Taking the Yuliangzhou section of the Xiangyang River in the Hanjiang River as an example, this paper uses the one-dimensional hydrodynamic model of the MIKE 11 one-dimensional hydrodynamic model to study the water surface line and the diversion ratio of the goose-head divergent channel based on the measured fixed sections in 2015 and the survey data from 2011 and 2017. The results show that: under different incoming water conditions at different levels, the left and right diversions in Yuliangzhou of the Han River are relatively stable with little change in the overall;as the total inflow of the main stream increases, the diversion ratio of the left diversion in the Hanjiang increases.