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A two-dimensional flow numerical model of the tidal reaches,which total length is more than 700 km,is established from Datong to the Yangtze River estuary.The tidal levels,velocities,diversion ratios and dynamic axes before and after the separate regulation of each reach and combined regulation of all reaches are obtained.The comparative analysis shows that the regulation project of a separate reach basically has no impact on velocity distributions and variations of diversion ratios of upper and lower reaches,the variations of dynamic axes are only within the local scope of the project.The regulation project of a separate reach also has less impact on the water level in the lower adjacent reaches,but will make the water levels in the upper reaches rise.After the implementation of the regulation projects for all reaches,the rise of water level in the upstream reaches will have a cumulative impact.
A two-dimensional flow numerical model of the tidal reaches, which total length is more than 700 km, is established from Datong to the Yangtze River estuary. Tidal levels, velocities, diversion ratios and dynamic axes before and after the separate regulation of each reach and combined regulation of all reaches are obtained. the comparative analysis shows that the regulation of a regulation of a separate reach basically has no impact on velocity distributions and variations of diversion ratios of upper and lower reaches, the variations of dynamic axes are only within the local scope of the project The regulation project of a separate reach also has less impact on the water level in the lower adjacent reaches, but will make the water levels in the upper breakthrough rise. After the implementation of the regulation projects for all reaches, the rise of water level in the upstream reaches will have a cumulative impact.