Flood storage and detention areas play an important role in flood control in the middle and lower Changjiang River,so it is significant to study the simulation method of the flooding processes in the flood storage and detention areas.Based on the measured width and flow discharge data of the embankment failure at Tuanzhou embankment alongside the Dongting Lake in 2024,the discharge process at the breach was reproduced,and the flood evolution was simulated by using a two-dimensional hy-drodynamic model to analyze the temporal and spatial variations of disaster-causing factors,including water inundation depth and flow velocity.The results showed that:① the development of embankment failure included three stages,namely,downward scou-ring,lateral widening and steady discharging;the total water volume entering the Tuanzhou embankment was estimated as 2.53×108 m3 based on the discharge process,which was basically equivalent to the water volume(2.63×108 m3)back-calculated ac-cording to the reservoir capacity curve.②The discharge and water level processes near the breach were basically consistent with the measurements,and the maximum water level in the Tuanzhou embankment was 31.955 m,which was basically consistent with the measured water level(31.960 m).③The inundation range calculated by the model was basically consistent with the range extracted based on remote sensing images.At the end of the calculation period,92.7%of the area was in severe inundation(the inundation depth＞1.5 m),the maximum inundation depth was about 8.2 m,and the flow velocity in the embankment increased first and then decreased,with the average flow velocities at each time(t=4 h,t=10 h,t=15 h and t=20 h)were 0.37,0.43,0.22 m/s and 0.05 m/s.The results can provide technical support for the risk assessment and flood control of embankment fail-ure.
关键词
堤坝溃决/洪水演进/水动力学模型/团洲垸/洞庭湖/蓄滞洪区
Key words
embankment failure/flood routing/hydrodynamic model/Tuanzhou embankment/Dongting Lake/flood storage and detention area
维普
万方数据