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根据西江中游干支流最新河道地形资料建立了一维非恒定水动力数学模型,采用实测洪水水文资料对主要干支流河道糙率进行了率定和验证。研究表明西江中游干流从上游红水河河床坡降0.74‰逐渐减小到浔江河床底坡降0.07‰,主要支流柳江和郁江河床底坡降都小于0.1‰;干流红水河、黔江和浔江率定后的综合糙率分别为0.056、0.055和0.036,呈现依次从上游向下游递减的趋势;柳江和郁江河床综合糙率分别为0.033和0.035,且该两条主要支流河床糙率随流量和水位变化幅度很小;红水河上具有调节能力的岩滩水库对库区上游河道糙率影响显著。黔江河道在近20年来河床糙率变化不大,但在该河道下游端大藤峡水库蓄水和运行后,可以预见该河道糙率将会呈减小趋势。
Based on the latest channel topography data of the main tributaries of the middle reaches of the Xijiang River, a one-dimensional unsteady mathematical model of hydrodynamics was established, and the roughness of the main dry-tributaries was calibrated and verified by the measured flood and hydrological data. The results show that the main stream in the middle reaches of the Xijiang River descends from 0.74 ‰ of the upper reaches of the Red River, and decreases 0.07 ‰ to the bottom of the Yingjiang River. The bottom slopes of the main tributaries of Liujiang River and Yujiang River are all less than 0.1 ‰. The main streams of the Red River, Qianjiang River, The comprehensive roughness rates of the two rivers are 0.056, 0.055 and 0.036, respectively, which show decreasing trend from upstream to downstream. The comprehensive roughness of Liujiang River and Yujiang River are 0.033 and 0.035, respectively, and the roughness of the two main tributaries is proportional to the flow rate And the change range of water level is very small. The Yantan reservoir with regulating ability on Hongshui River has a significant influence on the roughness of the upper reaches of the reservoir. The roughness of riverbed in Qianjiang River has not changed much in recent 20 years. However, it is forecasted that the roughness of this river channel will decrease after the water and operation of Dato-Tongxia Reservoir at the downstream end of the river.