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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Using a thermal tracer to estimate overland and rill flow velocities
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Using a thermal tracer to estimate overland and rill flow velocities

机译：使用热示踪剂估算陆上和钻探流速

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摘要

Flow velocity is a basic hydraulic property of surface flows and its precise calculation is necessary for process based hydrological models, such as soil erosion and rill development models, as well as for modelling sediment and solute transport by runoff. This study presents a technique based on infrared thermography to visualize very shallow flows and allow a quantitative measurement of overland flow and rill flow velocities. Laboratory experiments were conducted to compare the traditional dye tracer technique with this new thermal tracer technique by injecting a combined tracer (heated dye) into shallow flowing surface water. The leading edge tracer velocities estimated by means of infrared video and by the usual real imaging video were compared. The results show that thermal tracers can be used to estimate both overland and rill flow velocities, since measurements are similar to those resulting from using dye tracers. The main advantage of using thermography was the higher visibility of the leading edge of the injected tracer compared with the real image videos.
机译：流速是表面流的基本水力特性，它的精确计算对于基于过程的水文模型（例如土壤侵蚀和小溪发育模型）以及通过径流进行沉积物和溶质运移的建模是必需的。这项研究提出了一种基于红外热成像技术，以可视化非常浅的流量，并可以定量测量陆上流量和钻探流量的速度。通过将组合的示踪剂（加热的染料）注入浅水流动的地表水中，进行了实验室实验，以将传统的染料示踪剂技术与这种新的热示踪剂技术进行比较。比较了通过红外视频和通常的真实成像视频估算的前沿示踪剂速度。结果表明，热示踪剂可用于估算陆上和小溪流速，因为测量结果与使用染料示踪剂得出的结果相似。使用热成像的主要优点是，与真实图像视频相比，注入的示踪剂前沿的可见度更高。

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