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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >An optical tachometer for short-path measurement of flow speeds in shallow overland flows: improved alternative to dye timing
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An optical tachometer for short-path measurement of flow speeds in shallow overland flows: improved alternative to dye timing

机译：光学转速计，用于短距离测量浅水陆流中的流速：改进的染色时间替代方法

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摘要

Tracers, such as fluorescein dye, are widely employed to measure overland flow speeds by time-of-travel along measured flow paths. Among several disadvantages of this method are the involvement of human reaction time when using stopwatches, and the relatively long travel path that is consequently needed for reliable timing. Long flow paths mean that local variability along the flow path cannot be detected. This paper describes a new optical tachometer that overcomes these limitations, as well as offering other advantages. It is based on the use of a small floating reflector target that is carried on the surface tension film, and which passes between two reflective sensors mounted above the flow. The new device allows virtual 'spot' measurements of surface flow speed over a path as short as 1cm, and eliminates the influence of human reaction time. The new device is battery powered and portable, and provides an improved alternative to dye timing in many field and laboratory applications. Its use will allow the collection of more refined data than have hitherto been easily achievable.
机译：示踪剂（例如荧光素染料）被广泛用于通过沿测得的流动路径的行进时间来测量陆上流速。这种方法的几个缺点包括：使用秒表时，人的反应时间太长，以及可靠计时所需的相对较长的行程。长的流路意味着无法检测到沿流路的局部变化。本文介绍了一种新型的光学转速表，它克服了这些限制，并提供了其他优点。它基于使用小型浮动反射镜目标，该目标浮在表面张力膜上，并在安装在流上方的两个反射传感器之间通过。这种新设备可以虚拟地“测量”一条短至1cm的路径上的表面流速，并消除了人类反应时间的影响。该新设备由电池供电，可携带，在许多现场和实验室应用中提供了一种替代染色定时的改进选择。它的使用将允许收集比迄今为止容易实现的更为精确的数据。

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