二维水动力模型在渭河防洪评价中的应用

Application of Two⁃Dimensional Hydrodynamic Model to Flood Control Evaluation in Weihe River

二维水动力模型可以模拟水体在自然和人工水系统中的演进,应用越来越广泛。通过对渭河岐山县岐星段进行实地查勘、大断面测量,利用无人机倾斜摄影系统进行数据采集,生成立体模型、DEM数字高程模型并绘制1∶500地形图。根据历史资料进行河势演变分析,利用曼宁公式、二维水动力数学模型进行洪水分析计算,并对计算结果分析比较。二维模型考虑了沿程的水位变化、能量传递、弯道的能量耗散,整治工程实施后,工程河段100 a一遇洪水二维水动力模型计算水位比实施前上升0.10~0.48 m。

Two⁃dimensional hydrodynamic model can simulate the evolution of water body in natural and artificial water systems,and it is ap⁃plied more and more widely.Through the field survey and large section survey of Qixing section in Qishan County,Weihe River,the UAV oblique camera system was used to collect data,generate stereo model and DEM digital elevation model,and draw 1∶500 topographic map.According to the historical data,the river regime evolution was analyzed,and the flood was analyzed and calculated by using Manning formu⁃la and two⁃dimensional hydrodynamic mathematical model,and the calculation results were analyzed and compared.The two⁃dimensional model has considered the water level changes along the channel,energy transfer and energy dissipation in bends.After the implementation of the river training works,the water level calculated by the two⁃dimensional hydrodynamic model of a 100 year flood in the project section is in⁃creased by 0.10-0.48 m compared with that before the implementation.