Hydraulic control of a highly stratified estuarine front
Hydraulic control of a highly stratified estuarine front
复制标题
高度层状河口前缘的水力控制
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
W. Geyer
中科院分区：
文献类型：
--
作者：
D. MacDonald;W. Geyer
摘要在加拿大不列颠哥伦比亚省弗雷泽河河口的观测表明，在垂直方向上几米和水平方向上几百米处，非分层河流流出和高度分层的河流羽流之间存在一个突然的锋面过渡，其盐度差异大于25 psu。锋面大致遵循水深测量中的自然间断，以大约45°的角度穿过海峡，并且在大约3.5小时的时间内基本静止，以两次每日退潮中较大的一次之后的低潮为中心。前的位置是一致的观察显着超临界内部弗劳德数在前面，根据沿流方向的速度。这一观察结果与一维理论相矛盾，一维理论表明弗劳德数应该是1。然而，因为前面是倾斜的流出，可以选择一个坐标系，这是正常的前面，并为其中的一个c.
Abstract Observations at the mouth of the Fraser River (British Columbia, Canada) indicate an abrupt frontal transition between unstratified river outflow and a highly stratified river plume with differences in salinity greater than 25 psu across a few meters in the vertical direction and several hundred meters in the horizontal direction. The front roughly follows a natural break in the bathymetry, crossing the channel at an angle of approximately 45°, and is essentially stationary for a period of approximately 3.5 h centered on the low tide following the larger of two daily ebbs. The location of the front is coincident with observations of significantly supercritical internal Froude numbers at the front, based on velocities in the along-flow direction. This observation contradicts the one-dimensional theory, which indicates that the Froude number should be 1. However, because the front is oriented obliquely to the outflow, a coordinate system can be selected that is normal to the front and for which a c...