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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Analysis of landslide frequencies and characteristics in a natural system, Coastal British Columbia
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Analysis of landslide frequencies and characteristics in a natural system, Coastal British Columbia

机译：分析不列颠哥伦比亚省沿海自然系统中的滑坡频率和特征

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Two hundred and one debris slides and debris flows were analyzed in a 286 km(2) study area on the west coast of Vancouver Island, British Columbia, Canada. The study area remains essentially untouched by humans and therefore affords a natural setting in which to examine slope processes. Landslides were identified and characterized on aerial photographs from 1:15 000 to 1:31 680, and were then mapped and transferred to a GIS for analysis. Based on detailed landslide surveys, we propose a new method to accurately determine volume of landslides of this type by measured total area. Results indicate average denudation rates of 56 m(3) y(-1) km(-2), and higher natural rates of failure than analogous regions in coastal British Columbia. In contrast, the landslide rates are substantially less than those from forested watersheds. Landslide distribution is spatially clustered in air photograph epochs, and we propose intense storm cells within regional events as the causal mechanism. Further, failures occurred preferentially over the West Coast Crystalline Complex (by 1(.)4 times), a metamorphic assemblage of gabbros, schists and amphibolites, but 1(.)5 times less often over the Island Plutonic Suite, a granitic intrusive formation. The former result represents a new finding, while the latter corroborates findings of previous authors. We examined magnitude-frequency relationships of the data set and present for the first time a strong argument that the rollover effect is not merely an artefact, but is instead a consequence of the physical characteristics of the landslides themselves. We subsequently analyzed magnitude-frequency relationships from two other complete data sets from coastal British Columbia and produced a family of curves corroborating this result. Copyright (C) 2004 John Wiley Sons, Ltd.
机译：在加拿大不列颠哥伦比亚省温哥华岛西海岸的一个286 km（2）研究区域中分析了201个碎片滑梯和碎片流。研究区域基本上不受人类的影响，因此提供了检查坡度过程的自然环境。在从1：15 000至1：31 680的航拍照片上对滑坡进行了识别和定性，然后将其绘制地图并转移到GIS中进行分析。在详细的滑坡调查的基础上，我们提出了一种通过测量总面积来准确确定此类滑坡体积的新方法。结果表明，平均剥蚀速度为56 m（3）y（-1）km（-2），并且自然故障率高于不列颠哥伦比亚省沿海地区的类似地区。相反，滑坡发生率大大低于森林流域的滑坡发生率。滑坡分布在空间上聚集在空中照相时期，我们提出在区域性事件中形成强烈的风暴单元作为其成因机制。此外，故障优先发生在西海岸结晶复合体上（变质为长辉岩，片岩和角闪石的变体（1（。）4倍），但发生在花岗岩侵入构造的岛屿Plutonic Suite中的变差频率则少1..5倍）。 。前者的结果代表了一个新发现，而后者则证实了先前作者的发现。我们检查了数据集的幅度-频率关系，并首次提出了强有力的论据，即滑倒效应不仅是人工制品，而且是滑坡自身物理特征的结果。随后，我们从不列颠哥伦比亚省沿海的另外两个完整数据集中分析了幅度-频率关系，并得出了一系列曲线，证实了这一结果。版权所有（C）2004 John Wiley Sons，Ltd.

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