海洋沉积动力过程原位监测平台及其应用

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

利用倾斜仪、ADCP、PC-ADP、扇形声纳、OBS等先进仪器组建海洋沉积动力过程原位监测平台,并利用此平台获得了北部湾底部同步连续的波浪数据,流速剖面及近底紊流数据,距底0.5、0.9、1.3m的悬浮物浓度数据以及不同时间的地貌图像。实际观测表明,原位监测平台能够克服极端条件,系统地监测波流、悬浮物浓度以及地貌演化,获得数据可以为理论研究和工程实践提供支持。根据应用实例,建议加载流速计并减小扇形声纳的扫描范围,来弥补1.2～4m之间水动力数据的缺失并观测海底微地貌的变化。观测期间水体悬浮物质和海洋生物对光学仪器有较大影响,ABS可能比OBS更适合长期水下悬浮物浓度监测。

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.