Abstract：With the intensification of human activities and the impact of climate change, the conditions of the inflow of the five rivers and the main stream of the Yangtze River have changed greatly, and the hydrological relations between rivers and lakes have also changed. This paper constructed a two-dimensional coupled hydrodynamic model of the Yangtze River-Poyang Lake-Five River tails, simulated the outflow of Poyang Lake under extreme combined scenarios of the five river inflows, the Yangtze river inflow and interval rainfall. The results could provide technical support and method reference for flood control, drought resistance and water resource management decision-making of the Poyang Lake watershed.
