鄱阳湖康山蓄滞洪区洪水演进模拟研究OA

The Kangshan Flood Storage and Detention Area in Poyang Lake is a national flood storage and detention area,playing a vital role in protecting against floods exceeding design standards in the middle and lower reaches of the Yangtze River and in mitigating flooding and waterlogging disasters.To systematically evaluate the flood diversion and storage capacity and the flood routing characteristics of the Kangshan Flood Storage and Detention Area in Poyang Lake after the construction of a new diversion sluice,the independently developed two-dimensional hydrodynamic model"Poyang FS 1.3"was employed to construct a flood routing model for the area.After the model was validated through physical model tests,five diversion scenarios with different initial water levels for flood diversion were simulated and analyzed.The results show that the diversion water level exhibits a nonlinear positive correlation with the maximum diversion discharge.Higher water levels lead to stronger initial discharge capacity but faster decline in discharge.Under the high water level scenario(20.68 m),the planned flood storage volume of 1.57 billion m3 is reached approximately 42 h after diversion begins,whereas under the low water level scenario(18.68 m),only about 64%of the planned volume is reached after 48 h of diversion.The flood routing exhibits a spatial pattern of faster progression in the north and slower progression in the south,with low-lying areas inundated first.The inundation extent and depth increase significantly as the diversion water level rises.Agricultural losses due to inundation increase with diversion duration,but the rate of increase declines noticeably in the later stage.A comparison of the maximum differences in inundation losses at the same time under different scenarios reveals 10 million yuan between high and medium water levels,16 million yuan between medium and low water levels,and 23 million yuan between high and low water levels.After 48 h of diversion,the losses under the high,medium,and low water level scenarios are 328 million yuan,322 million yuan,and 312 million yuan,respectively.The findings can provide a scientific basis for flood control operation and decision-making in the Kangshan Flood Storage and Detention Area,as well as for the development of a digital twin for flood diversion and storage measures in Jiangxi Province.