淮河干流刘台子弯道水动力及河床变形数值模拟研究

为分析和评价刘台子弯道河段在不同整治方案下的工程效果,采用SIMHYD-2D平台构建二维泥沙数学模型对淮河干流临淮岗闸下—鲁台子河段2种整治方案进行水动力及河床变形数值模拟研究。结果表明:二维水沙数学模型能够很好地模拟河道的水力因子,也能合理地模拟自然条件下的冲淤分布,可以用于开展工程河段的冲淤演变预测分析;经过冲淤调整10 a后,在2种整治方案下,临鲁段河道主槽仍以冲刷为主,冲刷速度减缓,滩地仍以淤积为主,整体河道表现为冲刷;通过对比分析2种整治方案裁弯对上下游河道水沙运动及冲淤的影响、通航水流条件及新老河段未来冲淤情况,推荐方案2作为整治方案。

Computational research on hydrodynamic and bed morphologic response of Liutaizi waterway bend reach in main stream of the Huaihe River

In order to analyze and evaluate the engineering effect of different regulation schemes for the Liutaizi bend reach,a two-dimensional sediment mathematical model was built on SIMHYD-2D platform to simulate the hydrodynamic and bed deformation of the two regulation schemes from Linhuaigang sluice to Lutaizi reach in the main stream of the Huaihe River.The results show that the two-dimensional water and sediment mathematical model can well simulate the hydraulic factors and the distribution of scouring and silting under natural conditions,and can be used to predict the evolution of scouring and silting in the engineering reach.After 10 years of adjustment of scouring and silting,the main channel in Linlu reach is still scouring under the two regulation schemes.The speed of scouring slows down,the beach is still mainly silted,and the whole river channel is scoured.By comparing and analyzing the influence of two kinds of regulation schemes on the movement of water and sediment in the upper and lower reaches,navigation flow conditions and future scouring and silting in the new and old reaches,the second scheme is recommended as the regulation scheme.