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为探明导流槽工程岸坡冲刷特性,以流体力学和泥沙动力学相关理论为依据,通过对导流槽槽口、槽身岸边侵蚀线的分析与研究,探索了岸坡侵蚀特性在导流槽工程中的应用。结果表明:新开挖导流槽基本完成河道粗化、断面调整的时间约为450h,导流槽不同部位的侵蚀程度不一致,槽口处较槽身处侵蚀更为严重,最终侵蚀稳定时间也相对较长。导流槽岸坡侵蚀速率与流量不存在简单映射关系,侵蚀速率存在相位滞后现象,基本滞后约72h。同时,在导流槽开挖过水后,下游导流槽右岸会出现短期淤积现象,随着侵蚀过程的进一步加剧,该淤积滩地会消失。建议在今后的导流槽开挖建设中,导流槽冲刷稳定观测时间不低于500h。以上研究结果既是岸坡侵蚀理论在导流槽相关工程实践中的应用,也为河岸侵蚀研究提供了一定的数据支撑。
In order to find out the scour characteristic of the slope of the diversion channel engineering, based on the theory of hydrodynamics and sediment dynamics, the erosion characteristics of the slope slope and the bank of the diversion channel were analyzed and studied. Application in Guide Channel Engineering. The results show that the newly-built diversion channel basically completes the river course roughening, the time of section adjustment is about 450 hours, the erosion degree of different parts of the diversion channel is inconsistent, the erosion at the slot is more serious than that of the channel body, and the final erosion stability time Relatively long. There is no simple mapping relationship between the erosion rate and the flow rate of the diversion basin, and the phase lag rate exists in the erosion rate, with a lag of about 72 hours. At the same time, short-term siltation will occur on the right bank of the downstream diversion channel after excavation of the diversion channel. As the erosion process further aggravates, the siltation will disappear. It is suggested that in the future diversion trench excavation construction, the diversion channel erosion stability observation time is not less than 500h. The above results are not only the application of the theory of slope erosion in diversion channel related engineering practice, but also provide some data support for the study of river erosion.