Bed conduction impact on fiber optic distributed temperature sensing water temperature measurements

Error in distributed temperature sensing (DTS) water temperature measurements may be introduced by contact of the fiber optic cable sensor with bed materials (e.g., seafloor, lakebed, streambed). Heat conduction from the bed materials can affect cable temperature and the resulting DTS measurements. In the Middle Fork John Day River, apparent water temperature measurements were influenced by cable sensor contact with aquatic vegetation and fine sediment bed materials. Affected cable segments measured a diurnal temperature range reduced by 10% and lagged by 20–40 min relative to that of ambient stream temperature. The diurnal temperature range deeper within the vegetation–sediment bed material was reduced 70% and lagged 240 min relative to ambient stream temperature. These site-specific results illustrate the potential magnitude of bed-conduction impacts with buried DTS measurements. Researchers who deploy DTS for water temperature monitoring should understand the importance of the environment into which the cable is placed on the range and phase of temperature measurements.

Raw project data is available by contacting [e-mail]

分布式温度传感（DTS）的水温测量误差可能源于光纤电缆传感器与底质材料（例如，海底、湖底、溪底）的接触。底质材料的热传导可能会影响电缆温度，进而影响DTS的测量结果。在约翰戴伊河的中叉河段，由于电缆传感器与水生植被和细粒度底质材料的接触，导致的水温测量值受到影响。受影响的电缆段测得的一日温度范围比环境河水的温度范围降低了10%，并且滞后20至40分钟。植被-沉积物底质更深处的日温度范围比环境河水的温度范围降低了70%，并且滞后240分钟。这些特定地点的结果展示了底质传导对埋设DTS测量可能产生的影响的潜在幅度。对于部署DTS进行水温监测的研究人员来说，理解电缆放置环境对温度测量范围和相位的重要性至关重要。

原始项目数据可通过联系[e-mail]获取。