sand wave bed 沙波河床
A friendly polar bear loving nothing more than an audience and climbing out of his snowy bed to give a cruise ship a wave was caught on camera by a photographer, the Daily Mail of London reported.
据英国《每日邮报》报道，一位摄影家日前在北极斯瓦尔巴德群岛拍到一只超有表现欲的好客北极熊，当一艘游艇经过它家附近时，它从雪窝中爬出来，向过往的人们挥掌执意。
If the epicentre is on the seabed, that also lifts the water above the bed, creating a wave.
如果震中位于海底，板块运动带动上方海水起伏，形成波浪。
But the theory about the flow regime of the wave boundary layer, the wave friction factor, the bed shear stress and the initiation of sediment motion has not developed very well.
而且波浪是海岸地区一个非常重要的海洋水动力因素，波浪作用下底部边界层的流态、底摩阻系数、床面剪应力和泥沙起动的理论还不成熟。
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