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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Breach Discharge Estimates and Surface Velocity Measurements for an Earth Dam Failure Process Due to Overtopping Based on the LS-PIV Method
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Breach Discharge Estimates and Surface Velocity Measurements for an Earth Dam Failure Process Due to Overtopping Based on the LS-PIV Method

机译：基于LS-PIV方法的超载导致土坝破坏过程的破坏流量估计和表面速度测量

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摘要

Measuring the surface velocity and breach outflow discharge is a challenge in earth dam-break experiments. To solve this problem, large-scale particle image velocimetry (LS-PIV), a non-intrusive approach to measuring surface velocities, was applied in earth dam-break experiments. In this paper, two dam-break experiments were conducted in a large flume, and LS-PIV was used to measure the surface flow velocities of the dam breach. The flume was 50 m long, 4 m wide and 2 m high, and an idealized, non-cohesive, homogeneous earthen dam was placed in the middle of the flume. Three pressure sensors were used to measure the water depth over time. In addition, three high-speed digital cameras and two industrial cameras were used to record the dam breach process. The measured velocities were applied to evaluate the breach outflow discharge. Acceptable agreement was obtained between the discharges estimated with the LS-PIV and water level change methods. The surface velocity field was also obtained, and a dam crest cross section was selected to analyze the process of surface velocity change. Moreover, a convenient and simple formula was introduced to rapidly estimate breach discharge at the dam crest cross section. Finally, based on the Manning formula and surface velocity, the shear stress of the breach bottom was computed and discussed. The findings of this paper validate the accuracy and reliability of the LS-PIV technique for dam-break experiments and suggest that it is a reliable and advantageous technology for dam failure experiments.
机译：在土坝溃决实验中，测量表面速度和泄漏流出流量是一项挑战。为了解决这个问题，在大坝溃坝试验中采用了一种非侵入性的方法来测量表面速度的大型粒子图像测速仪（LS-PIV）。在本文中，在大水槽中进行了两次溃坝试验，并使用LS-PIV测量了溃坝的表面流速。该水槽长50 m，宽4 m，高2 m，并在水槽中间放置了一个理想的，非粘性的均质土坝。使用三个压力传感器来测量一段时间内的水深。此外，还使用了三台高速数码相机和两台工业相机来记录大坝的破坏过程。将测得的速度应用于评估泄漏流出流量。用LS-PIV估算的排放量与水位变化方法之间获得了可接受的协议。还获得了表面速度场，并选择了坝顶横截面来分析表面速度变化的过程。此外，引入了一个方便，简单的公式来快速估算坝顶横截面的违规排放量。最后，基于曼宁公式和表面速度，计算并讨论了裂口底部的剪应力。本文的发现验证了LS-PIV技术在大坝溃坝试验中的准确性和可靠性，并表明这是用于大坝溃败试验的可靠且有利的技术。

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