Velocity measurements at South China Sea

The observation site is located on the northern slope of the South China Sea (20.08°N, 115.2°E), with a water depth of 659 m. A bottom landing frame was deployed at the site from 00:00 on August 21, 2020 to 12:00 on August 22, with an observation duration of 36 h. The frame was equipped with velocity profilers (75k Hz-ADCP and 2M Hz-ADCP) and an Acoustic Doppler velocimetry (ADV). The 75k Hz-ADCP measured full-depth velocity profiles with sampling frequency of 1 Hz (75kHzADCP.mat). The 2M Hz-ADCP measured fine-scale (vertical resolution: 0.007 m) bottom boundary layer velocity profiles with sampling frequency of 1 Hz(2MHzADCP.mat). The ADV measured high frequency velocity (64 Hz) at 0.6 mab (ADV.mat).观测站点位于南海北坡（20.08°N，115.2°E），水深659米。2020年8月21日00:00至8月22日12:00，该站点布放了一套海底着陆架，观测时长共计36小时。该着陆架搭载了声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，ADCP，分为75kHz-ADCP与2MHz-ADCP）以及声学多普勒测速仪（Acoustic Doppler Velocimetry，ADV）。其中75kHz-ADCP以1Hz的采样频率测量全水深流速剖面，数据存储为75kHzADCP.mat；2MHz-ADCP以1Hz的采样频率测量垂直分辨率为0.007米的精细尺度底边界层流速剖面，数据存储为2MHzADCP.mat；ADV以64Hz的高频采样速率测量0.6 mab处的流速，数据存储为ADV.mat。