| The proposed wharf is a key project of grain wharf along the Yangtze River in Jiangsu province.Because land-based conditions are limited and can not meet the needs of development,there is an urgent need for relocation and expansion.It is necessary to study the influence of the proposed dock project on the engineering reach because of its complicated water and sediment conditions,hydrodynamic conditions and navigation environment.In this study,the non-equilibrium and non-uniform two-dimensional tidal flow mathematical model of the engineering reach is established,the hydrodynamic conditions,sediment concentration and riverbed erosion and deposition of the model are verified by the measured water and sand data of flood and dry seasons and topography.The results show that the mathematical model can simulate the process of tidal wave propagation and the movement of tidal current.On this basis,the water dynamics before and after the implementation of the proposed wharf are studied in detail.The research results are as follows:(1)after the implementation of the proposed wharf project,the high and low tide levels of the project reach have little change.Under the condition of the flood season,only the local water level near the wharf project changes,the water level changes generally within 0.02 m,and is limited to the local vicinity.In dry season,the variation trend of water level is basically the same as that of Khonj spring tide,and the range decreases.Therefore,the proposed wharf project has little influence on flood discharge and drainage of the Yangtze River.(2)the impact of the proposed wharf project on the ebb and flow pattern of the project area is small,and the impact is limited to the local part of the project area.Under the conditions of low tide in flood season,the flow direction is relatively smooth along the front line of the proposed wharf project,and the front flow direction of the water in the water area near the proposed wharf project is slightly southerly due to the wharf kick,with a smaller amplitude.In dry season and low tide,the variation of the flow field near the wharf project is basically the same as that in flood season,and the range decreases.There is a certain angle between the flow direction and the front line of the proposed wharf project under the condition of high tide in dry season.(3)The implementation of the project plan for the proposed wharf makes the adjustment of the flow trajectory mainly concentrated in the partial engineering area of the proposed wharf,but the overall trend has not changed.There is basically no change in the dynamic axis of the rising and falling tide before and after the implementation of the proposed terminal project.Under the condition of low tide during the flood season,the flow velocity in the 12.5m deep water channel,Tianshenggang channel,and Shaxi waterway in Tongzhou has little change.The velocity and direction of the project area of the proposed wharf in Nantong Waterway have little change,and the flow velocity in other areas is basically unchanged;high tide in dry season Under the circumstances,the flow velocity in the Tianshenggang waterway,Rugao Zhongcha,Liuhaisha waterway,and Tongzhou Shadong and West waterways remained basically unchanged.The flow velocity and direction of the proposed wharf project area of the Nantong Waterway changed little,and the flow velocity in other areas remained basically unchanged.(4)The changes in the diversion ratio caused by the proposed wharf under various hydrological conditions are very small,and the diversion ratio in Liuhaisha Channel,Rugao Zhongdian,Tianshenggang Channel,and Tongzhousha East-West Channel has basically no change.Therefore,the proposed wharf has a small impact on the rising and falling tide volume and diversion ratio of each branch. |
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