WAMSI 2 - DREDGING NODE - PROJECT 4.4 Continuous in situ monitoring of sediment deposition in shallow benthic environments

The objective of WAMSI DREDGING SCIENCE NODE Project 4.4 was to examine the suitability of automated in situ sediment deposition sensors based essentially on an upward facing nephelometer to assess sediment deposition. Prototype versions of this device have been deployed in situ and although the sensor currently gives useful information, the shape of the sensor needs to be optimized and the sensor readings need to be calibrated against settled sediment surface density as measured in units of mg cm2. The objective of Project 4.4, was to re-design, optimise and calibrate the deposition sensor head to more closely mimic the trapping of sediments on a coral's surface. The project determined how the new sensor geometry responds in the laboratory (at the National Sea Simulator (Sea Sim) based at the Australian Institute of Marine Science (AIMS, Townsville, Queensland)) caused by different particle size distributions under different turbulence regimes. a and also turbidity events and deposition events in situ during a field deployment in Cleveland Bay (Queensland, Australia)

Data is in the form of a report, which is a secured (printable, non-editable), searchable, Portable Document Format (PDF) showing the results of the analyses, and an Excel spreadsheet showing the result of the in situ deployment.

WAMSI疏浚科学节点（WAMSI DREDGING SCIENCE NODE）第4.4项目的目标为：检验以朝上式散射浊度仪（upward facing nephelometer）为核心的自动化原位沉积物沉积传感器在沉积物沉积评估中的适用性。该设备的原型版本已完成原位部署，尽管当前传感器可输出有效监测数据，但其外形仍需优化，且传感器读数需以mg·cm⁻²为单位的沉降沉积物表面密度为基准进行校准。第4.4项目的核心目标为重新设计、优化并校准该沉积传感器探头，使其能更精准地模拟珊瑚表面的沉积物捕获过程。本项目明确了新型传感器几何结构在实验室环境中的响应特性——该实验室环境设于澳大利亚海洋科学研究所（Australian Institute of Marine Science, AIMS，昆士兰州汤斯维尔）的国家海洋模拟设施（National Sea Simulator, Sea Sim），其响应由不同湍流条件下的不同颗粒物粒径分布所引发；同时还明确了在澳大利亚昆士兰州克利夫兰湾（Cleveland Bay）开展野外部署期间，原位发生的浊度事件与沉积事件的相关规律。本项目的数据集包含两类成果文件：一是受保护的可打印、不可编辑且支持检索的便携式文档格式（PDF）报告，其中呈现了各项分析的结果；二是Excel电子表格，其中收录了原位部署的实测结果。