Department of Biological and Agricultural Engineering, NC State University, Raleigh, NC 27695, USA.
Sensors (Basel). 2023 Apr 5;23(7):3758. doi: 10.3390/s23073758.
Scour events can severely change the characteristics of streams and impose detrimental hazards on any structures built on them. The development of robust and accurate devices to monitor scour is therefore essential for studying and developing mitigation strategies for these adverse consequences. This technical note introduces a novel scour-monitoring device that utilizes new advances in the fiber-optic distributed temperature sensing (FO-DTS) technology. The novel FO-DTS scour-monitoring device utilizes the differential thermal responses of sediment, water, and air media to a heating event to accurately identify the locations of the interfaces between them. The performance of the device was tested in a laboratory flume under flow conditions with water velocities ranging from 0 m/s to 0.16 m/s. In addition, the effect of the measurement duration on the device's measurement accuracy was also investigated. The FO-DTS scour-monitoring device managed to detect the sediment-water and water-air interfaces with average absolute errors of 1.60 cm and 0.63 cm, respectively. A measurement duration of fewer than 238 s was sufficient to obtain stable measurements of the locations of the sediment-water and water-air interfaces for all the tested flow conditions.
冲刷事件会严重改变河流的特性，并对建在其上的任何结构造成有害的危害。因此，开发强大而准确的监测冲刷的设备对于研究和制定缓解这些不利后果的策略至关重要。本技术说明介绍了一种利用光纤分布式温度传感 (FO-DTS) 技术新进展的新型冲刷监测设备。新型 FO-DTS 冲刷监测设备利用泥沙、水和空气介质对加热事件的差分热响应，准确识别它们之间的界面位置。该设备在流速范围为 0 m/s 至 0.16 m/s 的水流条件下的实验室水槽中进行了性能测试。此外，还研究了测量持续时间对设备测量精度的影响。FO-DTS 冲刷监测设备成功地检测到泥沙-水和水-气界面，平均绝对误差分别为 1.60 厘米和 0.63 厘米。对于所有测试的水流条件，少于 238 秒的测量持续时间足以获得泥沙-水和水-气界面位置的稳定测量。
