浮标追踪在水动力数学模型验证中的应用

Application of digital buoy tracing method in verification of hydrodynamic mathematical model

针对常规水动力数学模型验证资料的不足,采用数值模拟追踪浮标与河道内投放物理浮标对比的方法进行模型验证。结果表明,如所建一维感潮网河非恒定水流数学模型能够较好的模拟所在网河区的水流往复运动规律,在水文站点的水位、流量实测值与计算值基本吻合的同时,数学模型中投放的数字浮标与实际网河中的物理浮标两者的运动轨迹在相位和振幅两个方面也能够基本保持一致,说明浮标追踪法在水动力数学模型的验证中具有较好的应用价值,且该法可同时从时间和空间两方面完成模型的验证,对完善和发展水动力数学模型具有重要的作用。

Digital buoy was used to trace physical buoy in natural river for verification of hydrodynamic mathematical model to overcome the difficulty of insufficient data or information for the verification. Results show that the traces of digital buoy and physical buoy will keep in line both in phase and amplitude if two requirements are satisfied, i.e. the one-dimensional unsteady flow mathematical model is well developed to produce a good-quality simulation of flow reciprocation in tidal river network, and the calculations of water level and discharge at the hydrological station agree with the measurements. This indicates that digital buoy tracing method is valuable in application to model verification that is possibly done via comparison of spatio-temporal variations. Thus, this technique plays an important role in improving and developing hydrodynamic mathematical model.