摘要
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。
One dimensional unsteady flow numerical model was established with the new topography of the middle reaches of Xijiang River with main tributaries. Calibrations and verification of roughness have been finished with field flood hydrological data. Bed slopes of middle reaches of Xijiang River decreased from 0.74%o upstream of Hongshuihe River to 0.07%o downstream of Xunjiang River. Comprehensive roughness of Hongshuihe, Qianjiang and Xunjiang rivers were calibrated as 0. 056, 0. 055 and 0. 036 respectively, also showing decreasing trend from upstream to downstream in the middle reaches of Xijiang River. Roughness of the two tributaries, Liujiang River and Yujiang River, were 0. 033 and 0. 035, and showed small variation with flow dis- charges and water levels. Roughnesses of the upstream reaches from Yantan dam in Hongshuihe River have been affected significantly by regulation of the reservoir. Roughness of Qianjiang River changed little in recent 20 years, however it was predicted to be decreased after operation of Datengxia Reservoir in the downstream of the river.
出处
《泥沙研究》
CSCD
北大核心
2016年第2期20-25,共6页
Journal of Sediment Research
基金
国家自然科学基金项目(51309263
51309264)
广州市珠江科技新星专项(2014J2200067)
关键词
西江中游
糙率
圣维南方程
河床坡降
流量
Xijiang River
roughness
Saint Venant equations
bed slope
flow discharge
