IN-SITU MONITORING PLATFORM FOR MARINE SEDIMENT DYNAMICS AND ITS APPLICATION

Several advanced optical and acoustic survey instruments(Tiltmeter, ADCP, PC-ADP, OBS, etc.) have been assembled on a quadruped platform for in-situ monitoring of marine dynamics. A testing case was carried out in the Beibu Gulf, and synchronous and continuous wave data, velocity profiles and turbulent current data near bottom were gained by the instruments on the platform. Suspended sediment concentrations were measured at the depth of 0.5 m, 0.9 m and 1.3 m above the seabed, and topographic images at different times were also obtained. Observations indicate that the in-situ monitoring platform can survive from extreme conditions. With it we can make systematic observation of wave and current, SSC and topographic features. The data obtained can be used in both theoretical study and engineering purpose. In accordance with the practice of the present case, we suggest adding current meters at depth of 1.2 m and 4m above the seabed to get more data of current velocity. Sweep range should be further decreased to help define smaller changes in microfeatures. Suspended matter and sea creatures have serious influences on optical sensors, and ABS is better than OBS for long-term measurements of SSC.