中文摘要：

博罗浅滩为东江下游主要碍航河段，近20年来其来水来沙条件与河床演变趋势受大规模河床采沙、上游水库与水利枢纽建设等人类活动影响强烈，对通航条件与航道整治产生重大影响．针对人类活动影响下河床演变与航道整治特点，建立了正交曲线网格坐标系统下的东江下游二维水沙数学模型．在运用水沙实测资料对模型验证的基础上，计算分析了剑潭枢纽运行初期下游的河床冲刷和推荐整治方案实施后的整治效果．结果表明，推荐方案实施后，博罗浅滩河段可满足设计航道尺度要求．

英文摘要：

The Boluo shoal blocks seriously the shipping in the lower reaches of the Dongjiang River. In the last 20 years, the water-sediment conditions and fluvial process of the reaches have been greatly influenced by the human activities such as large-scale sand mining from riverbed, and construction of reservoirs and hydro projects. On one hand, the increase of the discharge in the dry season and the water depth improve the navigation ability; on the other hand, the severe riverbed downcutting results in the continuous drop of the lowest designed water level of navigation, and the rapid increase of the water surface gradient worsens the navigation conditions of the local reach. According to the characteristics of the fluvial process and channel regulation affected by human activities, a 2D mathematical model is developed, which adopts the boundary-fitting orthogonal coordinate system. Based on the verification of the water surface profile, and the distribution of flow velocity and the riverbed deformation, the riverbed erosion and water level decline after the construction of Jiantan Project and the regulation effects after the implement of the recommended projects are predicated.