三峡工程运用初期上荆江杨家脑至郝穴河床冲淤变化试验研究

摘要

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.利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上荆江杨家脑至郝穴河段的冲淤变化过程、冲淤规律、数量及分布,并在此基础上预测河势调整趋势.研究成果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.%Due to the reservoir regulation of the Three Gorges Project (TGP), the water and sediment load flowing into the Jingjiang river reach downstream of,TGP have undergone significant changes both in the process and in the amount. Conspicuous erosion, which leads to river regime changes in some locations, has occurred in the Jingjiang river channel, consequently affecting the embankments, bank protection works along both sides, river regulation projects, and the stability of river bed at different levels in the long - run, and further affecting the flood control,navigation, ecology, environment and the integrated function of the river in these areas. In this paper, the movable bed model test of Changjiang River Flood Protection Model was adopted to study the changing process, the amount and distribution ,of scouring and silting of the Jingjiang river course from Yangianao to Haoxue at the initial operation stage of TGP. Based on this understanding, the tendency of river changes were predicted as well. The obtained research results may be taken as technical references for the planning and designing of river harnessing and river regime control projects in this river course.