基于MIKE FLOOD的洪泽湖周边滞洪区洪水演进模拟研究

基于实测断面资料建立了研究区的一维水动力模型,基于高精度DEM以及1∶10000地形图建立了研究区的二维水动力模型,并用MIKE FLOOD将一维模型和二维模型进行耦合,构建了洪泽湖周边滞洪区一、二维耦合的洪水演进数学模型。利用2003年历史洪水资料对模型参数进行了率定,并以2007年历史洪水资料进行了验证。以洪泽湖百年一遇设计洪水为模型上边界,二河闸、三河闸以及高良涧闸的现行调度方案的水位-流量关系为模型下边界,对洪泽湖百年一遇设计洪水方案进行模拟计算,当蒋坝水位达到14.33m时,洪泽湖周边滞洪区开始滞洪,得到开始滞洪后不同时段研究区内各类洪水风险要素的动态分布情况以及最大淹没水深、淹没历时,验证了模型的合理性,可用于蓄滞洪区洪水演算分析。

Flood routing simulation of hongze lake detention basin based on Mike Flood

Gauged cross section data is used for 1-D hydrodynamic model, and both high resolution DEM and topographic map of 1:10000 is used for 2-D hydrodynamic model. A 1D-2D coupled mathematical model is established to simulate flood routing in Hongze Lake Detention Basin based on Mike Flood. The historical flood data in 2003 and 2007 is used to calibrate and verify the parameters in this model. Calculation of design flood plan(P=1%) is used for model simulation in which design inflow is used for upper boundary of model and Q-H curves of Sanhe Gate, Erhe Gate and Gaoliangjian Gate is used for lower boundary of model. Hongze Lake Detention Basin begins impound when the water level of Jiangba station exceed 14.33m. The dynamic distribution of risk elements in the study area indicates that the model has rationality in simulation. With the increase in flood magnitude, flooded area, flooded duration and other risk factors showed a change of trend. It can be used for flood routing analysis in detention basin.