嘉陵江取水口项目通航影响数值模拟研究

Numerical Simulation Research on Navigation Effect of Project of Water Intake in Jialing River

随着国民经济发展与基础设施的不断完善,在通航河道修建的取水项目工程日益增多,这些在通航河段的工程项目均会不可避免地对航道、通航条件产生一定影响。为了科学合理地制定项目实施方案,以嘉陵江某取水口项目为例,通过建立二维数模与分析实测资料,统计分析拟建工程前后附近水域流速、水位等方面的变化,论证拟建项目对于嘉陵江航道通航的影响。结果表明,拟建工程对工程河段过水面积影响较小,且埋于河床下,其结构阻水作用有限,河道流态、主流带位置改变较小;另外,考虑到该河段的河道组成及川江河床演变特点,可以预测该工程建成后,对工程河段附近泥沙冲淤变形、河床形态等无甚影响,亦不会对工程河段的河床演变规律及河势造成影响。

With the development of the national economy and the continuous improvement of infrastructure,the number of water intake projects built in navigable river is increasing. These projects will inevitably have some impact on the channels and navigation conditions. In order to make a scientific and reasonable project implementation plan,taking a water intake project in Jialing River as an example,through the establishment of two- dimensional numerical simulation and analysis of measured data,statistically analyzing the change of flow rate and water level in the vicinity of water area before and after the proposed project. The influence of the proposed project on the navigable channel of the Jialing River is proved. The results show that the proposed project has little influence on the water area of the project,and buried under the river bed. The water- retardation effect of the structure is limited. The change of channel regime and mainstream belt position is small. In addition,taking into account the channel composition of the river beach and the evolution characteristics of Chuanjiang river bed,it can be predicted that after the completion of the project,there is no influence on the deformation of the sediment and the river bed in the vicinity of the engineering section.Nor will have an effect on the fluvial process and river regime of engineering reach.