整治工程影响下大清河航道水流泥沙冲淤分析

Analysis of Flow and Sediment Scouring and Silting in Daqinghe River Channel under the Influence of Regulation Project

基于实测资料对大清河航道的水动力及泥沙特征进行了分析,从水流连续性方程,泥沙运动方程出发,建立了水动力泥沙二维数学模型,在此基础上对典型水沙条件下河道内水流、泥沙运动、航道选线及淤积预测进行了模拟研究。重点分析了工程整治后河道内流态、地形变化对航道冲淤的影响,对航道整治工程进行了评价。研究表明,大清河泥沙运动主要受径流携带的泥沙,河道地形影响,航道工程整治后仍保持上冲下淤的态势,水流归槽效应是航道主槽淤积的主要因素。

Based on the measured data,the hydrodynamic and sediment characteristics of Daqinghe River channel are analyzed.Based on the continuity equation of flow and sediment transport equation,a two-dimensional mathematical model of hydrodynamic sediment is established.On this basis,the flow,sediment transport,channel route selection and sedimentation in study area under typical water and sediment conditions are simulated.Emphasis is laid on the analysis of the effects of river flow and topographic changes on channel siltation after the regulation of the project,and the evaluation of the channel regulation project is carried out.The results show that the sediment movement in Daqinghe River is mainly affected by runoff sediment,river topography factors.The channel effect is the main factor of channel siltation after channel engineering renovation.