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Numerical Study on Hydrodynamic Environment Effect of Channel-Narrowing Project in the Complex Tidal Estuary

The recent evolution of the North Branch of Changjiang Estuary is seriously affect the development of social economy in the region of Changjiang Estuary, regulation project of North Branch is extremely urgent. Now, the Channel-narrowing project in local implementation of North branch is already implemented. For study the effect of Channel-narrowing project on the hydrodynamic environment of the North Branch, a 2-D vertical average tidal current numerical model of Yangtze Estuary was set up with flexible irregular triangular grid to simulate the hydrodynamic before and after the Channel-narrowing Project in the North Branch. The following conclusions are drawn from the study. The results show that, the characteristics of tidal current in North Branches are not change a lot; the flood volume has been greatly decreased by the width of the North branch in the estuary area being narrowed down; the high tidal level lowers after the project. On the other hand, the low water level became increase and decrease, but the change of relative amplitude is not obvious. To sum up, the narrow project works to the advantage of the hydrodynamic environment in North branch.