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首页> 外文期刊>Computers & geosciences >2D dry granular free-surface flow over complex topography with obstacles. Part Ⅰ: experimental study using a consumer-grade RGB-D sensor
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2D dry granular free-surface flow over complex topography with obstacles. Part Ⅰ: experimental study using a consumer-grade RGB-D sensor

机译：具有障碍物的复杂地形上的2D干粒状自由表面流。第一部分：消费级RGB-D传感器的实验研究

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摘要

Avalanches, debris flows and other types of gravity-driven granular flows are a common hazard in mountainous regions. These regions often have human settlements in the lower parts of valleys, with human structures dangerously exposed to the destructive effects of these geophysical flows. Therefore a scientific effort has been made to understand, model and simulate geophysical granular flows. In order for computer models and simulations to be of predictive value they need to be validated under controlled, yet nature-like conditions. This work presents an experimental study of granular flow over a simplified mountain slope and valley topography. The experimental facility has a rough bed with very high slope at the upstream end and adverse slope on the downstream end, following a parabolic profile. Obstacles are present in the lower regions. Transient measurements of the moving granular surfaces were taken with a consumer-grade RGB-D sensor, providing transient 2D elevation fields around the obstacles. Three experimental configurations were tested, with semispheres of different diameters and a square dike obstacle. The experimental results are very consistent and repeatable. The quantitative, transient and two-dimensional data for all three experiments constitute excellent benchmarking tests for computational models, such as the one presented in a companion paper.
机译：雪崩，泥石流和其他类型的重力驱动的颗粒流是山区的常见危害。这些地区通常在山谷的下部有人类住区，人类结构危险地暴露于这些地球物理流的破坏作用。因此，已经做出科学努力来理解，建模和模拟地球物理颗粒流。为了使计算机模型和仿真具有预测价值，需要在受控但又类似于自然的条件下对它们进行验证。这项工作提出了简化的山坡和山谷地形上的颗粒流的实验研究。实验设备具有抛物线形的粗糙床层，在上游端具有很高的坡度，在下游端具有不利的坡度。下部区域存在障碍物。使用消费级RGB-D传感器对移动的颗粒表面进行瞬态测量，从而提供障碍物周围的瞬态2D高程场。测试了三种实验配置，具有不同直径的半球形和方形堤坝障碍物。实验结果非常一致且可重复。所有这三个实验的定量，瞬态和二维数据构成了计算模型的出色基准测试，例如在随附论文中提出的一种。

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