靖远县"20250623"暴雨洪水分析OA

To investigate the occurrence characteristics of rainstorm and flood disasters under the background of ongoing climate change,this study used the"20250623"rainstorm and flood event in Jingyuan County as a case study,focusing on key parameters including rainfall intensity,peak discharge,and return period.Typical survey sections were selected from the short-duration"20250623"rainstorm and flood event.A combination of methods was applied,including the rainstorm and flood survey method,Manning's formula,the Pearson Type Ⅲ(P-Ⅲ)frequency curve fitting method,and regional empirical formulas.These methods were integrated with information technologies such as the"Space-Air-Ground"integrated sensing system,5-min rainfall telemetry,rainfall radar monitoring,and digital twin technology,supplemented by analyses of runoff generation,flow concentration,and underlying-surface conditions,to investigate the causes and characteristics of the rainstorm and flood event.The results showed that this rainstorm had a short duration and high intensity and was a non-frontal rainfall event.The rainstorm center was located in Liangjiao Village.The 3-h precipitation amount at the rainstorm center reached 50.2 mm,corresponding to a return period of 10 years.The peak discharge of the flood(Han'gou River section at Qingyang Village)reached 199 m3/s,with a return period of 10 years,consistent with that of the 3-h rainstorm.The water information technologies applied in this study played an important role in real-time rainstorm monitoring and dynamic flood analysis.The findings provide methodological reference and data support for rainstorm-flood disaster investigation and flash flood warning in ungauged regions.