Data_Quantification of the Effect of a Seabed-Mounted Observation Platform on Bottom.rar

The bottom boundary layer (BBL) serves as the critical interface governing energy dissipation and material transport in marine systems, playing a pivotal role in seafloor geomorphic evolution and biogeochemical cycling. However, structural interference from conventional seabed-mounted observation platforms induces distortions in near bed hydrodynamic parameter measurements—a systematic quantification of such errors remains conspicuously absent. Through a field comparative experiment in China's coastal sea, this study implemented synchronized monitoring over 60 consecutive hours to quantitatively resolve platform-induced perturbations in BBL hydrodynamics. Results indicate that frames of the platforms reduced the east-west mean flow velocity by 41.9%, increased the north-south flow by 3.6%, amplified vertical flow velocity by 200%, and induced a 14.6°counterclockwise deflection in flow direction. Turbulence mixing processes were enhanced by the frames, with shear stress, turbulent kinetic energy (TKE), and dissipation rate increasing by 10.5%, 7.7%, and 40%, respectively, while TKE dissipation rate surged by an order of magnitude during flow reversal phases. This study reveals the systematic impacts of conventional platforms on BBL hydrodynamic processes, providing critical guidelines for optimizing ocean in-situ observatory design and correcting historical BBL datasets, thereby advancing the scientific precision of marine dynamic process research.