中文摘要：

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1in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。

英文摘要：

ASM instrument was developed for high resolution observation at the bottom of moving water, which has the advantage of multi-point measurement. In this study, ASM was fixed in a tetrapod to obtain suspended sediment concentration near the bottom （ 1 m） in the North Passage, Yangtze Estuary. The stability and sensitivity of turbidity were also analyzed and compared to synchronous OBS data. Moreover, both the relationship between turbidity, suspended sediment grain size and concentration have obtained through the laboratory sedi- ment calibration experiment. Combined with the bottom water-sediment observation system, this work will give insight into a certain aspect of ASM and the application of the coastal measurement.