The role of wind in the near field and midfield of a river plume
The role of wind in the near field and midfield of a river plume
复制标题
风在河流羽流近场和中场中的作用
DOI：
10.1002/2014gl060606
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发表时间：
2014
影响因子：
5.2
通讯作者：
A. Horner‐Devine
中科院分区：
文献类型：
--
作者：
G. Kakoulaki;D. MacDonald;A. Horner‐Devine
利用2009年、2010年和2011年在一系列风和河流流量条件下落潮期间在河口附近释放的表面漂流物的观测结果，量化了风在梅里马克河羽流近场和中场区域的作用。动量平衡项的比较和羽流轨迹的分析表明，在羽流的所有区域，包括近场，风速>4 m s−1时，羽流对风向敏感，风的影响通常被认为是二阶的。中程（4-12公里）比近场（0-4公里）受风的影响更大。然而，瞬时风的影响在离嘴较远的地方减弱，据推测，这是由于较长时间尺度过程的重要性越来越大（即，Ekman运输）。与沿海岸的风相比，烟羽对横向海岸风的敏感性较低，特别是在动量占主导地位的河口附近。
The role of wind in the near‐field and midfield regions of the Merrimack River plume is quantified using observations from surface drifters released near the river mouth during ebb tide in 2009, 2010, and 2011 under a range of wind and river discharge conditions. Comparison of momentum balance terms and analysis of plume trajectories suggests that the plume is sensitive to wind direction for wind speeds >4 m s−1 in all regions of the plume, including the near field, where wind influence has typically been considered second order. Intermediate ranges (4–12 km) were more strongly influenced by the wind than the near field (0–4 km). However, the influence of the instantaneous wind diminished farther from the mouth, presumably, due to the growing importance of longer time scale process (i.e., Ekman transport). The plume was less sensitive to cross‐shore winds than alongshore winds, particularly near the river mouth, where momentum dominates.