Abstract Rainfall-induced shallow landslide is a common geological hazard around the world that can pose serious threat to both lives and property. Previous studies suggested that rainfall induced shallow landslides always occurred either above the bottom of a downward wetting front in infiltration, or below a rising water table. This paper proposed a different mechanism of shallow landslides in a modelling approach. The comprehensive physics-based Integrated Hydrology Model (InHM) and the infinite slope stability model were employed on a virtual slope to simulate the hydrologic response and estimate the slope stability. Different failure mechanisms with various characteristics were investigated under diverse rainfall scenarios (i.e., various combinations of rainfall depths, durations and temporal patterns). The results showed a novel mechanism of shallow landslides: a significant vertical change in saturated hydrologic conductivity causes the accumulation of infiltrated water, and subsequently leading to an increase pore pressures and landslides in unsaturated soil layer. More importantly, this kind of landslide would bring larger landslide volume even with smaller total rainfall depths. This study expanded our understanding about landslides and had important application in alleviating the loss of lives and property.

中文翻译：

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不同降雨特征下降雨诱发浅层滑坡机制的模拟研究

摘要 降雨引起的浅层滑坡是世界范围内常见的地质灾害，对生命和财产造成严重威胁。以前的研究表明，降雨引起的浅层滑坡总是发生在下渗的向下湿润锋的底部之上，或者发生在上升的地下水位之下。本文在建模方法中提出了浅层滑坡的不同机制。在虚拟边坡上采用综合物理综合水文模型（InHM）和无限边坡稳定性模型来模拟水文响应并估算边坡稳定性。在不同的降雨情景（即降雨深度、持续时间和时间模式的各种组合）下研究了具有不同特征的不同失效机制。结果显示了浅层滑坡的一种新机制：饱和水电导率的显着垂直变化导致渗透水的积累，随后导致非饱和土层中孔隙压力和滑坡的增加。更重要的是，即使总降雨深度较小，这种滑坡也会带来更大的滑坡体积。这项研究扩展了我们对滑坡的认识，并在减轻生命和财产损失方面具有重要应用。即使总降雨深度较小，这种滑坡也会带来较大的滑坡体积。这项研究扩展了我们对滑坡的认识，并在减轻生命和财产损失方面具有重要应用。即使总降雨深度较小，这种滑坡也会带来较大的滑坡体积。这项研究扩展了我们对滑坡的认识，并在减轻生命和财产损失方面具有重要应用。