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首页> 外文期刊>Engineering Geology >Plan curvature and landslide probability in regions dominated by earth flows and earth slides
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Plan curvature and landslide probability in regions dominated by earth flows and earth slides

机译：在以泥石流和泥石流为主的地区，计划曲率和滑坡概率

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Damaging landslides in the Appalachian Plateau and scattered regions within the Midcontinent of North America highlight the need for landslide-hazard mapping and a better understanding of the geomorphic development of landslide terrains. The Plateau and Midcontinent have the necessary ingredients for landslides including sufficient relief, steep slope gradients, Pennsylvanian and Permian cyclothems that weather into fine-grained soils containing considerable clay, and adequate precipitation. One commonly used parameter in landslide-hazard analysis that is in need of further investigation is plan curvature. Plan curvature is the curvature of the hillside in a horizontal plane or the curvature of the contours on a topographic map. Hillsides can be subdivided into regions of concave outward plan curvature called hollows, convex outward plan curvature called noses, and straight contours called planar regions. Statistical analysis of plan-curvature and landslide datasets indicate that hillsides with planar plan curvature have the highest probability for landslides in regions dominated by earth flows and earth slides in clayey soils (CH and CL). The probability of landslides decreases as the hillsides become more concave or convex. Hollows have a slightly higher probability for landslides than noses. In hollows landslide material converges into the narrow region at the base of the slope. The convergence combined with the cohesive nature of fine-grained soils creates a buttressing effect that slows soil movement and increases the stability of the hillside within the hollow. Statistical approaches that attempt to determine landslide hazard need to account for the complex relationship between plan curvature, type of landslide, and landslide susceptibility.
机译：阿巴拉契亚高原和北美中部大陆分散地区的破坏性滑坡突显了滑坡灾害制图的必要性，以及对滑坡地形地貌发展的更好理解。高原和中大陆具有滑坡所必需的成分，包括足够的起伏，陡峭的坡度，宾夕法尼亚和二叠纪的旋风，这些风化成含有大量粘土的细粒土壤，并有足够的降水。滑坡灾害分析中一个需要进一步研究的常用参数是平面曲率。平面曲率是指山坡在水平面中的曲率，或者是地形图上轮廓的曲率。山坡可细分为凹的向外平面曲率的区域（称为凹陷），凸的向外平面曲率的区域（称为鼻）和笔直轮廓的区域（称为平面区域）。对平面曲率和滑坡数据集的统计分析表明，具有平面平面曲率的山坡在以泥石流（CH和CL）为主的泥石流和泥石流为主的地区发生滑坡的可能性最高。随着山坡变得更加凹凸不平，滑坡的可能性降低。空心发生山体滑坡的可能性比鼻子高。在凹陷处，滑坡物质汇聚到斜坡底部的狭窄区域。收敛性与细粒土壤的粘结性相结合，产生了支撑作用，减缓了土壤运动并增加了凹陷处山坡的稳定性。试图确定滑坡灾害的统计方法需要考虑平面曲率，滑坡类型和滑坡敏感性之间的复杂关系。

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