基于SOBEK的黄河口一维水力学模型适用性研究

Applicability of a One-dimensional Hydraulic Model in Yellow River Estuary Based on SOBEK

基于黄河口生态环境需水及其配置研究的需要,以平水年洪水过程资料为基础,在黄河下游河口段建立了一维河流数学模型,对年度内及年际间的流量水位过程进行模拟,研究模型的适用性。结果表明,模型在冬季冰冻期内的适用性较低,主要原因为冬季冰封期使模型运用条件发生改变,模拟结果出现误差;去除冰封时段后,模型适用性得到恢复,满足河段的年内应用;而年际间模拟结果表明,河床高程变动是影响模型精度的主要原因,在充分考虑河床的冲淤变化后,经适当校正,模型在河口段仍具有较高的适用性。

In the study on Yellow River estuary environmental flow,a one-dimensional hydraulic model using SOEBK was set up based on the flood data in the normal years.And the model applicability was studied.The results show that the model has a low applicability in ice period because of the changing condition of the model running.However,the model has a good running in non-ice period.Then a comparable analysis of simulation shows that the ability of the hydraulic model to correctly compute water levels depends strongly on the trend in the morphological development of the Yellow River bed,and it still has high applicability considering bed level.