Fixed acoustic Doppler current profiler (ADCP) velocity measurements are used to investigate headland vorticity generation and recirculation in ∼20 m depth around the small (∼1 km) central California headland Pt. Sal. To reduce vorticity estimation noise, velocities are reconstructed from the first two Empirical Orthogonal Function modes representing ≈73% of the variance. Using fixed ADCPs, depth‐averaged vorticity is estimated west and south of Pt. Sal. Only one west‐location vorticity component is estimated, leading to negative vorticity bias for northward flow. The south location vorticity is consistent with estimates from parallel vessel transects on one day. The observed depth‐averaged flow V was primarily along‐bathymetric contours and varied ±0.2 ms⁻¹ across subtidal and tidal frequency bands. The depth‐averaged normalized vorticity varied ±8 across all frequency bands. Vorticity distributions are skewed with opposite sign at west and south locations, and is more likely at the west location. At both locations, depth‐averaged vorticity and velocity are inversely related, with relationship asymmetric with sign of V, indicating headland and farther upstream vorticity generation. Binned‐mean depends on both V and its time‐derivative, and indicates vorticity recirculation across the headland. The ∼2 h vorticity adjustment timescale and the associated short excursion distances indicate vorticity generation between south and west locations. Potential vorticity changes across the headland are different for positive and negative V indicating headland asymmetric vorticity generation. Pt. Sal occupies a nondimensional parameter space that is unique relative to other well studied headlands.

中文翻译：

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宽带电流下小岬角的涡流再循环和不对称发电

固定声学多普勒电流剖面仪（ADCP）速度测量用于调查加利福尼亚中部小岬角（〜1 km）周围约20 m深度中的岬角涡流的产生和再循环。萨尔 为了减少涡度估计噪声，可从代表方差≈73％的前两个经验正交函数模式重建速度。使用固定的ADCP，可以估算Pt西部和南部的深度平均涡度。萨尔 仅估计了一个西位置的涡度分量，导致向北流动的负涡度偏差。南面位置的涡度与一天中平行血管横断面的估计值一致。观测到的深度平均流量V主要沿测深轮廓，变化范围为±0.2 ms ^-1跨潮汐和潮汐频段。在所有频带上，深度平均归一化涡旋度变化为±8。涡度分布在西部和南部位置以相反的符号倾斜，并且在西部位置更可能出现。在这两个位置，深度平均涡度和速度成反比，关系与V的符号不对称，表明岬角和更远的上游涡度的产生。装箱均值取决于两个V以及它的时间导数，并表明整个岬角的涡旋再循环。约2小时的涡度调整时间尺度和相关的短偏移距离表明南，西位置之间的涡度产生。对于正负V，整个岬角的潜在涡度变化是不同的，指示了岬角不对称涡旋的产生。铂 萨尔（Sal）占据了一个无量纲的参数空间，相对于其他经过充分研究的岬角而言，它是唯一的。