饶河鄱阳湖湖区航道整治疏浚方案

在对饶河湖区航道情况及碍航浅滩特性分析的基础上,建立研究河段的一维水流数学模型,利用实测资料进行模型验证。运用数学模型计算设计流量条件下的湖区航道各浅滩段航槽疏浚深度的关键参数及工程前后的水面线变化,分析工程后的水动力条件变化及航槽断面流速变化。结果表明,工程后研究河段水位下降,河段水力比降减小,湖区浅滩段航槽断面平均流速减小,双港下游河道段流速增加。采用规范公式计算航槽疏浚后湖区各浅滩段航槽的年回淤厚度,研究结果可供设计单位参考。

Dredging scheme for Rao River waterway regulation in Poyang Lake

Based on the analysis of the Rao River waterway conditions and characteristics of the navigation-obstructing shoals,we establish a one-dimensional flow mathematical model to study the river section,which is verified by the measured data.By the mathematical model,we calculate the key parameters of the dredging depth channel in shallow shoal section and the variation of water line under the designed flow condition before and after the project,and analyze the changes of hydrodynamic conditions and the variation of flow velocity in section of the navigation channel.After the project,the water level and hydraulic gradient of the river section decreased.The average velocity of the navigation channel section in the shoal section of the lake area decreased,and the flow velocity of the lower reaches of the Shuanggang section increased.The annual back silting thickness of the navigation channel of shoals in the lake area after dredging of the navigation channel was calculated using the standard formula.The research results are available for reference by the design unit.