基于FloodArea模型的龙须河流域暴雨洪涝淹没模拟研究-气象研究与应用

文章信息/Info

Title:: Simulation Study of Flood in Longxu River Basin Based on the FloodArea Model

Author(s):: Dai Yuhan¹; Huang Luting²; Li Mingzhi²; Chen Xin¹; 1. Tiandong Meteorological Station, Tiandong 531500;
2. Baise Meteorological Office, Baise 533000

Keywords:: FloodArea; Rainstorm and flood; flooding simulation; Longxu river basin

摘要:: 选取龙须河流域内及周边气象区域站和国家站的逐日降雨量资料,采用广义极值分布函数来进行拟合优度检验并计算出不同重现期的致洪面雨量。将不同重现期致洪面雨量、小时雨型分布、高程数据代入FloodArea模型进行洪水淹没模拟,得到不同重现期下面雨量淹没范围和水深。结果表明:龙须河流域中下游水位上涨明显,靠近龙须河中游的荣华水文站点模拟水淹最深,出现2次涨水,模拟水位上涨超过3 m,通过和实际水文站数据对比,洪水发展过程、最高水淹深度要滞后于降水峰值5-7小时,且与实际的水文站的水位差较吻合,证明FloodArea模型在龙须河流域具有较好的洪水淹没模拟效果,为暴雨洪涝灾害风险评估和预警业务提供较好的技术支撑。

Abstract:: By using the generalized extreme value distribution functions and data of daily rainfall with all of the meteorological stations in Longxu River basin, the return period values of flood-causing area rainfall are calculated. Flooding simulation is obtained from FloodArea model by using the return period values, data of hourly rainfall and the digital elevation model, the return period values of flooding scope and flooding depth are carried out. The results of the typhoon (1415 Kalmaegi) flooding simulation show that there is a sharp rise of the water level at middle and lower reaches of Longxu river basin, the deepest of flood is Ronghua hydrologic station close to the middle of river, water level has increased twice, simulating water level has increased by over 3 meters, According to compare hydrologic stations, the peak of flooding depth is lagging behind 5-7 hours of rainfall peak, the simulation result of FloodArea model agrees with the fact. This indicates that the FloodArea model generates good simulation effect of flooding in Longxu river basin and it can be need in the risk evaluation and early-warning of rainstorm and flood disasters.