Acoustic Surface Elevation Dynamics data Marconi salt marsh

At the semi-natural constructed Marconi salt marsh, bed level change data were collected using state-of-the-art Acoustic Surface Elevation Dynamics (A-SED) instruments. This recently developed instrument measures the distance between the bed and the instrument through the echo of an acoustic signal. The instrument is set-up to be able to collect measurements when the sensor of the instrument is fully inundated. A burst of eight samples (sampling frequency of 5 Hz) was stored at a measurement interval of 5 to 15 minutes. The instruments were installed downward looking, with the sensor head aimed vertically at the bottom. The instruments were serviced, cleaned and data were downloaded every two to three months. A post-processing script was developed in Python to convert the acoustic return signals to bed level change data. The measurements were validated with manual readings of the height above bed (HAB) of the sensors every time the instruments were serviced. <br>

在半自然人工构建的马可尼盐沼（Marconi salt marsh）中，采用国际先进的声学表面高程动力学（Acoustic Surface Elevation Dynamics，简称A-SED）仪器采集床面高程变化数据。这款新近研发的仪器通过声学信号回波，测量传感器与床面之间的距离。该仪器的设置逻辑为，仅当仪器传感器完全被水淹没时，方可开展测量采集。以5至15分钟的测量间隔，存储一组包含8个采样点的采样序列，采样频率为5赫兹。所有仪器均朝下安装，传感器探头垂直对准床面底部。每两至三个月对仪器进行维护、清洁，并下载采集所得数据。基于Python开发了一套后处理脚本，用于将声学回波信号转换为床面高程变化数据。每次对仪器进行维护时，均通过人工读取传感器的床面以上高度（height above bed，HAB）对测量结果进行验证。