Regionalization of rainfall thresholds: an aid to landslide hazard evaluation
Regionalization of rainfall thresholds: an aid to landslide hazard evaluation
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DOI：
10.1007/s002540050300
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发表时间：
1998-08-01
期刊：
影响因子：
--
通讯作者：
Crosta, G
中科院分区：
文献类型：
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作者：
Crosta, G
降雨、土壤性质和形态是控制浅层滑坡的主要因素。研究人员对意大利北部引发土壤滑坡的一系列气象事件进行了研究，以确定降雨阈值并评估可能的区域化。土壤特性、触发降雨以及不同地点的当地岩性和形态设置被用作渗透模型的输入。该方法可以识别皮埃蒙特、阿尔卑斯山前和阿尔卑斯地区的几种触发条件。这表明需要使用与其他方法得出的不同的降雨阈值。当与土壤渗透性和厚度相关时，强度与降雨持续时间的关系变得尤为重要，并证明了先前降水的作用。道路涵洞异常排水的事件揭示了人类结构在引发此类现象中所扮演的角色。考虑到基岩岩性、地形、渗流和局部饱和条件，本文展示了边坡稳定性分析的不同方法。
Rainfall, soil properties, and morphology are major factors controlling shallow landsliding. A series of meteorological events that triggered soil slips in northern Italy were studies to define rainfall thresholds and to evaluate a possible regionalization. Soil properties, triggering rainfall, and local lithological and morphometrical settings of different sites were used as input to an infiltration model. The approach allows the recognition of several triggering conditions in the Piedmont, Pre-Alpine and Alpine regions. This suggests the need for different rainfall thresholds with respect to those derived with other methods. Intensity versus rainfall duration relationships become particularly important when related to soil permeability and thickness, and demonstrate th role of antecedent precipitation. Events with exceptional water discharge from obstructed road culverts reveal the role played by anthropic structures in triggering such phenomena. Different approaches to slope stability analysis are shown, taking into account bedrock lithology, topography, seepage, and local saturation conditions.