蓄滞洪区洪水演进数学模型研究及应用

Flood routing mathematical model for flood detention basin

以二维非恒定流基本控制方程为理论基础,采用有限体积法,建立洪水演进数学模型.根据蓄滞洪区内不同地形条件及洪水调度方案,以相应的水动力学方法,对模型区域的通量、蓄水量和洪水实时淹没水位进行计算,并考虑了公路建设中路基体积、涵洞尺度、取土方量对蓄滞洪区洪水演进的影响.采用恩县洼蓄滞洪区的历史洪水淹没资料进行模型验证,模拟了自然滞洪和分区滞洪两种情况下的洪水淹没过程,模拟结果与历史统计淹没范围基本吻合,预报了公路建设后蓄滞洪区洪水位的变化及风浪对洪水最大淹没范围的影响,为蓄滞洪区中的工程建设和防洪影响评价提供了研究思路和方法.

Based on 2D unsteady flow governing equations, the finite volume method is adopted to establish a flood routing mathematical model. According to different terrain conditions in detention basin and flood operational plans, the flux, water storage and real-time inundated water level of the study region are calculated with corresponding hydrodynamic methods. The influences of roadbed volume, culvert size and earthwork on flood routing in highway construction in the detention basin are also considered. The model adopts historical flood inundation data in Enxianwa detention basin to simulate the flood inundation process in two cases of natural detention and zoning detention. The simulation results are in agreement with historical observed data, which can predict the flood level variation in the detention basin after highway construction and the influence of storm on the maximal flood inundation range. This model gives research thoughts for engineering constructions and impact assessment of flood control in detention basins.