Mackenzie三角洲风暴相关的海岸水动力现象

针对西北风和东风这2种强风在Mackenzie三角洲开敞水域时期占主导地位的特点,运用SWAN模型对1次西北向风暴过程中的风暴浪进行模拟,并基于实测风、流数据和MODIS数据对2次东风引起的海岸水动力现象进行分析。结果表明:西北向风暴影响水域中上层的波浪和强流,引起明显的波浪增水和波能耗散;东向风暴可以引起从海表到海底的强流,甚至强度较弱的持续东风都可以引起上升流和水体混合;西北风和东风都会使水底的细小泥沙发生运动。

Coastal hydrodynamic phenomena generated by the storm in waters off Mackenzie Delta

Northwest and east wind events are two major types of strong winds that dominate waters off Mackenzie delta during open water summer seasons. A storm from the northwest during the Oct. 2008 storm is selected, and the SWAN model is applied to simulate the generated storm waves in waters off the delta during this storm. Also, the coastal hydrodynamic phenomena caused by east wind events are analyzed based on the observed wind, current data and MODIS data. The results show that, northwest storms generate strong waves that impact the delta waves and strong currents in the upper and middle layers of ocean, inducing the obvious wave set-up and wave dissipation. East storm winds cause the strong currents from the surface to the bottom of ocean, and even mild sustaining east winds can cause the upwelling and mixing in waters off the delta. In addition, both the northwest and east winds can lift the fine sediment at the bottom.