Rip Current Observations via Marine Radar
Rip Current Observations via Marine Radar
复制标题
通过海洋雷达进行裂流观测
DOI：
10.1061/(asce)ww.1943-5460.0000229
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Catalán
中科院分区：
文献类型：
--
作者：
M. Haller;D. Honegger;P. Catalán
新的遥感观测表明存在的裂流羽流在X波段雷达图像。在外滩群岛（北卡罗来纳州达克）收集的观测数据显示，在10天的时间内，低潮、低能、形态驱动的裂流有规律地发生。遥感数据得到了现场海流测量的证实，表明深度平均裂流速度为20 e40 cm =s，而有效波高为Hs 50：5e 1 m。有些令人惊讶的是，这些低能量的撕裂有一个表面签名，有时从海岸延伸几个冲浪区宽度，并持续几个小时的时间，这是在对比与最近的裂流观测与拉格朗日漂流。这些遥感观测提供了一个更全面的裂流流场的图像，并允许识别几个裂流事件，而这些裂流事件没有被现场传感器捕捉到，以及裂流沿海岸偏转的时间。为了比较其他雷达平台上的裂流特征，还给出了一个简单校准的雷达图像示例。最后，通过对裂流垂直结构的现场观测，发现了一个排除裂流成像的离岸风应力阈值（0.02 m = s2）。DOI：10.1061/（ASCE）WW.1943-5460.0000229。© 2014美国土木工程师学会。作者关键词：裂流;雷达;冲浪区;近岸流体动力学。
New remote sensing observations that demonstrate the presence of rip current plumes in X-band radar images are presented. The observations collected on the Outer Banks (Duck, North Carolina) show a regular sequence of low-tide, low-energy, morphologically driven rip currents over a 10-day period. The remote sensing data were corroborated by in situ current measurements that showed depth-averaged rip current velocities were 20e40cm=s whereas significant wave heights were Hs 50:5e1m. Somewhat surprisingly, these low-energy rips have a surface signature that sometimes extends several surf zone widths from shore and persists for periods of several hours, which isin contrastwith recent rip current observations obtained with Lagrangian drifters. These remote sensing observations provide a more synoptic picture of the rip current flow field and allow the identification of several rip events that werenot captured by thein situ sensors and times of alongshoredeflection oftherip flowoutsidethesurfzone.Thesedataalsocontainaripoutbreakeventwherefourseparateripswereimagedovera1-kmstretchofcoast. For potential comparisons of the rip current signature across other radar platforms, an example of a simply calibrated radar image is also given. Finally,insituobservationsoftheverticalstructureoftheripcurrent flowaregiven,andathresholdoffshorewindstress(.0:02m=s 2 )isfoundto preclude the rip current imaging. DOI: 10.1061/(ASCE)WW.1943-5460.0000229. © 2014 American Society of Civil Engineers. Author keywords: Rip currents; Radar; Surf zone; Nearshore hydrodynamics.
影响因子：
2.9
作者：
J. MacMahan;Jeff L. Brown;Jenna A. Brown;E. Thornton;A. Reniers;T. Stanton;M. Henriquez;E. Gallagher;J. Morrison;M. Austin;T. Scott;N. Sénéchal
通讯作者：
J. MacMahan;Jeff L. Brown;Jenna A. Brown;E. Thornton;A. Reniers;T. Stanton;M. Henriquez;E. Gallagher;J. Morrison;M. Austin;T. Scott;N. Sénéchal