In-Situ Observation on the Influence of Internal Waves on Deep-Sea Sand Ripple Evolution in the Dongsha Region of the South China Sea

The data used in this study were collected through field observations carried out in the Dongsha region of the South China Sea from August 16 to August 31 (~16 days). An in-situ observation quadripod for bottom boundary layer in abyssal sea developed by the our research team was deployed at the site (117°31E, 21°12N), with a water depth of approximately 720 m, to observe the hydrodynamics and sand ripples. The observation quadripod was instrumented with a 75 kHz Acoustic Doppler Current Profiler (ADCP), a 6 MHz Acoustic Doppler Velocimeter (ADV), a high-precision pressure sensor, and a deep-sea camera.