长江上游胡家滩航道整治数值模拟研究

长江上游胡家滩为弯曲展宽河段浅滩。探讨了胡家滩浅滩河段河床演变特征、碍航特性及滩险成因,提出了航道整治思路与方案。应用平面二维水流泥沙数学模型,采用2002—2011年的水沙序列资料,对方案整治效果进行分析。结果显示,整治后航槽流速增加且不会成为急滩,消落期航槽内泥沙冲刷加强,起冲时间提前,冲刷历时延长,航道尺度满足规划要求,航槽基本稳定,说明采用筑坝、疏浚与炸礁相结合的方法对胡家滩浅滩航道整治较为有效。

Numerical simulation of Hujiatan waterway regulation in upper reaches of the Yangtze River

Hujiatan waterway is a bending and broadening reach located in the upper reaches of the Yangtze River.This paper studies the bed evolution characteristics,navigation-hindering features,and formation causes of Hujiatan shoal waterway,and puts forward the waterway regulation ideas and schemes.The regulation effects are analyzed using 2-D flow and sediment mathematical model and based on the flow and sediment data of year 2002 to 2011.The results show that after the regulation,the navigation channel flow velocity increases and the reaches will not turn into rapids.Moreover,in the water level fluctuating period,the channel sediment erosion strengthen,the scour starting time advanced and the erosion duration prolonged.Correspondingly,the channel scale meets the design requirements and can remain stable,which indicates that the combined methods of construction of dikes,dredging and reef blasting are effective to Hujiatan shallow shoal regulation.