Abstract Subsurface water processes are principle triggering and driving factors during slope movements. However, the hydraulic properties that drive groundwater flow along the slope remain poorly understood. Moreover, landslide deposits are often characterized by layering and fissures that cause high heterogeneity in the distribution of hydraulic properties. This heterogeneity leads to great uncertainty in the prediction of groundwater flow paths. This study aimed to improve understanding of hydraulic and transport properties of deep earth slides and to identify preferential flow directions inside the landslide body. A dye tracer test was used to estimate transport parameters and characterize groundwater flow paths. The results indicate that in the studied landslide, two groundwater flow types exist and are related to the presence of fissured rock blocks and debris horizons embedded in a fine matrix. The estimated low groundwater flow velocity has rarely been estimated in other studies of this landslide type. The groundwater flow direction appears to be mainly influenced by the failure surface shape and differs from the sliding direction. Our results differ from those in other landslide studies and improve our knowledge of groundwater flow properties in deep earth slides; furthermore, they offer a new contribution to slope stability analyses and formula, and to the effective design of mitigation strategies.

中文翻译：

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用于评估泥石流和运输参数的示踪剂测试：Montecagno 滑坡案例研究（意大利）

摘要 地下水过程是边坡运动的主要触发和驱动因素。然而，驱动地下水沿斜坡流动的水力特性仍然知之甚少。此外，滑坡沉积物通常以分层和裂缝为特征，导致水力特性分布的高度非均质性。这种异质性导致地下水流动路径的预测存在很大的不确定性。本研究旨在提高对深层土体滑坡的水力和输运特性的理解，并确定滑坡体内的优先流动方向。染料示踪剂测试用于估计传输参数和表征地下水流动路径。结果表明，在所研究的滑坡中，存在两种地下水流类型，它们与镶嵌在精细基质中的裂隙岩块和碎屑层的存在有关。在这种滑坡类型的其他研究中很少估计估计的低地下水流速。地下水流向似乎主要受破坏面形状的影响，与滑动方向不同。我们的结果不同于其他滑坡研究中的结果，并提高了我们对深部滑坡地下水流特性的了解；此外，它们为斜坡稳定性分析和公式以及缓解策略的有效设计提供了新的贡献。地下水流向似乎主要受破坏面形状的影响，与滑动方向不同。我们的结果不同于其他滑坡研究中的结果，并提高了我们对深部滑坡地下水流特性的了解；此外，它们为斜坡稳定性分析和公式以及缓解策略的有效设计提供了新的贡献。地下水流向似乎主要受破坏面形状的影响，与滑动方向不同。我们的结果不同于其他滑坡研究中的结果，并提高了我们对深部滑坡地下水流特性的了解；此外，它们为斜坡稳定性分析和公式以及缓解策略的有效设计提供了新的贡献。