Both the process and the amount of the water and sediment load flowing into the Jingjiang river reach downstream of the Three Gorges Project (TGP) have changed significantly due to the regulation and storage of the reservoir. Conspicuous erosion in Jingjiang river channel has resulted in river regime changes in parts of the reach, and will consequently influence the embankments and bank protection works along both sides, the river regulation projects and the stability of riverbed, thereby further affecting the flood control, navigation, ecology, environment and the integrated service function of the river in these areas. In this study, movable bed model of the Changjiang River Flood Protection Physical Model was used to study the changes of erosion and sedimentation in this reach at the initial operation stage of TGP. The tendency of river regime changes were predicted as well. Research results will offer technical reference for the planning and design of river regulation and river regime control projects in this river course.%三峡水库修建后,由于水库调蓄作用,进入坝下游荆江河道的水沙过程发生了显著变化.荆江河道产生较明显的冲刷,已引起局部河段的河势调整,将在相当长时期内对两岸堤防、已建护岸工程和河道整治工程及河道的稳定产生不同程度影响,进而影响该地区的防洪、航运、生态与环境,以及河流的综合服务功能的正常发挥.采用长江防洪实体动床模型试验,研究了三峡工程运用初期不同时期荆江重点险工段调关弯道的冲淤变化过程,并在此基础上预测河势调整趋势.研究成果可为该段河道的治理和河势控制工程规划、设计等提供技术参考.
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