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Evaluation of Current and Wave Measurements from a Coastal Buoy

机译：从沿海浮标评估电流和波测量

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The Chesapeake Bay Interpretive Buoy System (CBIBS) collects real-time measurements of currents and directional waves from a series of small buoys designed for coastal regions. The buoys use an AXYS Technologies TRIAXYS directional wave sensor and a downward looking 1 MHz Nortek Aquadopp Profiler for current profiles. In this experiment, a bottom mounted Nortek acoustic wave and current (AWAC) profiler was deployed next to one buoy in 7 m water for 1 month (April 2008) to collect reference current and wave data to evaluate the performance of the buoy wave gauge in the small, short waves common to the region, and to understand how buoy motion affects the fidelity of the current measurements. Over 75% of the total current velocity energy was well described by a regional tidal model. The buoy-mounted current profiler compared well with the bottom-mounted current profiler in both speed and direction at all depth cells. For all currents greater than 0.1 m/s, the mean of the absolute value of the difference in current magnitude was less than 0.01 m/s. The mean of the absolute value of difference in current direction was 5°. An analysis of average intervals demonstrated that an average interval of 2 minutes achieved 96% of the best possible measurement compared to a 10 minute average. Significant wave height ranged from 0.1-0.7 m and peak periods varied from 2-4 s. The buoy mounted wave gauge reported wave period accurately, but may under-report significant wave height. Wave direction between the buoy and AWAC agreed well for all waves greater than about 0.25 m.
机译：切萨皮克湾解释浮标系统（CBIBS）从为沿海地区设计的一系列小型浮标收集电流和定向波的实时测量。浮标使用Axys Technologies Tri XYS定向波传感器和向下寻找1 MHz Nortek Aquadopp Profiler，用于当前配置文件。在该实验中，底部安装诺泰克声波和电流（AWAC）探查部署旁边7米水一个浮标1个月（2008年4月），以收集参考电流和波数据来评估所述浮标波计的在性能该区域的小，短波共用，并了解浮标运动如何影响当前测量的保真度。区域潮汐模型良好地描述了超过75％的总电流速度能量。浮标安装的电流分析器在所有深度细胞的速度和方向上使用底部安装的电流分析器进行比较。对于大于0.1米/秒的所有电流，当前幅度差的绝对值的平均值小于0.01米/秒。电流方向差异的绝对值的平均值为5°。平均间隔的分析证明，与10分钟相比，2分钟的平均间隔达到了96％的最佳测量。显着的波形高度范围为0.1-0.7米，峰值周期从2-4秒变化。浮标安装波测量值的波动准确地，但可能会在报告显着的波形高度。浮标与AWAC之间的波浪方向同意所有波浪大于约0.25米。

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    《OCEANS》|2008年||共5页
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    Doug Wilson; Eric Siegel;

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  • 中图分类 P75-53;
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