Jiaxing area as a typical plain tidal river network area, is threatened by flood. And to the flood processes, downstream tide is one of the three major influencing factors. Hence, in order to investigate the influence of downstream tide on the flood processes, a coupled hydrologic and hydrodynamic model is established. And different flood processes under four different tidal processes are calculated in this model. Through comparing the different water level change processes, the relationship between flood processes and downstream tide is summarized. Finally, some relevant suggestions on Jiaxing flood control and drainage planning are put forward.

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