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ASM是现场悬浮物浓度的高分辨率剖面观测仪,在测量悬沙浓度方面具有多点同步的优点。将ASM应用于长江口北槽近底三脚架观测系统,观测近底1m的泥沙浓度剖面。结合同步的OBS实测数据,对比分析了ASM所测浊度数据的可靠性及敏感度。通过对ASM的浊度参数进行含沙量转换的室内标定实验,分析了水体浊度、悬浮物颗粒和浓度间的关系,讨论了泥沙颗粒大小及级配差对ASM观测的影响。结合近底层水沙观测系统,给出了ASM的应用前景,可为基于该仪器的河口海岸滩槽水沙观测及相关研究提供科学依据。
The ASM is a high-resolution profiler for on-site suspended matter concentrations that offers the advantage of multi-point synchronization in measuring suspended sediment concentrations. The ASM was applied to the near-bottom tripod observation system in the north channel of the Yangtze Estuary, and the sediment concentration profile at the bottom of 1m was observed. Combined with the synchronized OBS data, the reliability and sensitivity of ASM measured turbidity data were compared. The ASM turbidimetric parameters were used for the calibration of sediment concentration. The relationship between the turbidity of the water body and the concentration of suspended solids was analyzed. The influence of sediment particle size and gradation on the ASM observation was discussed. Combined with near-surface water and sediment observation system, the application prospect of ASM is given, which can provide a scientific basis for the observation and research on the water and sediment of estuaries and beach troughs based on this instrument.