Baffle array is generally embedded ahead of the protecting site for reducing rock avalanche’s flow energy. This study explored the arc-shape baffles in comparison with common baffles (cylindrical and square baffles) according to the application of science in practice. The comparing process of three categories of baffles was delved into experimentally, primarily highlighting the disaster reduction effectivity. The comparison of disaster reduction effective between these three categories of baffles is analyzed by three elements, which are deposition, VRR (velocity decrease rate), and U* (dimensionless velocity). Based on the rock avalanche final deposition, the optimal configuration for arc shape, square, and cylindrical baffles satisfy Sr = 4.5 and Sc = 3.5, Sr = 4.5 and Sc = 4.5, and Sr = 4.5 and Sc = 2.5, separately. As suggested from the results, the arc-shape baffle is the optimal case among those three categories of baffle. Shape alteration (cylindrical to arc-shape) can elevate the fragment block degree; the succeeding avalanches can occur around the avalanche deposits, causing kinetic energy to dissipate significantly. Besides, based on the contrast of VRR, U*, and deposition, arc-shape baffle mechanism was reported significantly superior to block. The energy dissipation system of the arc-shape baffle is primarily explained as: (1) the friction of rock fragment will be generated in the movement around the arc surface, thereby causing additional loss of kinetic; (2) a natural cushion is formed when rock fragment accumulated between the arc-shape baffle, being critical to energy dissipation for subsequent rock avalanches.

中文翻译：

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不同挡板系统受岩崩影响的比较

挡板阵列一般嵌入在保护地点的前面，以减少岩崩的流动能量。本研究根据科学在实践中的应用，探讨了弧形挡板与普通挡板（圆柱形和方形挡板）的比较。对三类挡板的比较过程进行了实验研究，主要突出了减灾效果。这三类挡板减灾效果的比较从沉积、VRR（速度下降率）和U*（无量纲速度）三个要素进行分析。根据岩崩最终沉积，弧形、方形和圆柱形挡板的最佳配置分别满足 Sr = 4.5 和 Sc = 3.5，Sr = 4.5 和 Sc = 4.5，以及 Sr = 4.5 和 Sc = 2.5。从结果中可以看出，弧形挡板是这三类挡板中的最佳情况。形状改变（圆柱形到弧形）可以提高碎片块度；随后的雪崩可能发生在雪崩沉积物周围，导致动能显着消散。此外，基于 VRR、U* 和沉积的对比，据报道弧形挡板机构显着优于块。弧形挡板的耗能系统主要解释为：（1）岩石碎片绕弧面运动时会产生摩擦力，从而造成额外的动能损失；(2) 圆弧形挡板间岩屑堆积形成天然垫层，对后续岩崩能量耗散起到关键作用。