A laser profilometry technique was upgraded to detect underwater bed level evolution with a laser and a single camera for highly transient laboratory experiments. The proposed procedure is simple, but achieves a similar performance as that met by more complex and expensive methods. This technique was applied to a dam-break test case over a mobile bed in a channel with a 90° bend, for which water and bed levels were both continuously recorded at five different places. Photogrammetry was then used to reconstruct the final topography, whose main features could be explained by analysing only a few appropriately chosen linear bed profiles. This cheap, simple, flexible and accurate method thus proves to be an interesting alternative to more complex methods for morphodynamics investigations in the case of fast transient flows.

升级了激光轮廓测量技术，以使用激光和单台相机检测水下床位演变，用于高度瞬态的实验室实验。所提出的过程很简单，但实现了与更复杂和昂贵的方法相似的性能。该技术被应用于一个 90° 弯曲通道中移动床上的溃坝测试案例，在五个不同的地方连续记录水位和河床水位。Photogrammetry was then used to reconstruct the final topography, whose main features could be explained by analysing only a few appropriately chosen linear bed profiles. 因此，这种廉价、简单、灵活和准确的方法被证明是在快速瞬态流动情况下用于形态动力学研究的更复杂方法的有趣替代方法。