宽浅河段航道整治线宽度确定方法

Study on determining method of the width of waterway regulation line for the broad-shallow river

为解决航道整治线宽度理论公式求解过程中假定工程前后参数不变产生的计算误差,提出一种确定整治线宽度的新方法。该方法从河流水流运动、泥沙运动以及河床形态机理出发,通过理论研究,推导了持续冲刷状态下和输沙平衡状态下航道整治线宽度的计算公式,并利用整治效果良好的实际工程进行验证。结果表明:新方法可以规避工程前后相关参数的取值问题;与已有大多数方法相比较,新方法确定的整治线宽度与实际工程应用值最为接近,验证了该方法的可行性。

At present,the theoretical formulas for determining the width of waterway regulation lines were mostly solved by establishing a certain relationship between the flow and sediment conditions before and after the project.Many parameters were involved in these formulas,and in the solving process,it was usually assumed that value of part parameters in the formula is the same before and after the project.However,some changes may occur before and after the project,affecting the accuracy of the width of regulation lines.In order to avoid errors caused by this assumption,a new method to determine the width of waterway regulation lines was proposed.Based on the mechanism of flow movement,sediment movement and river bed topography,two determining methods for the width of waterway regulation lines under continuous scouring condition and sediment transport equilibrium condition were put forward by theoretical study,and the proposed methods were verified by practical projects with good regulation effect.The results show that the proposed methods have good engineering results,and compared with most existing methods,the width of the regulation lines determined by the new method is the closest one to the actual value of engineering project,which can provide a good theoretical support for waterway regulation projects.