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The influence of slow-moving landslides on landscape evolution in the eastern Apennine Mountains, Italy.

机译：慢速滑坡对意大利亚平宁山脉东部景观演变的影响。

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摘要

This study quantifies the morphology of slow-moving landslides in the Eastern Apennine Mountains of southern Italy and explores how they contribute to local landscape evolution. Our results suggest that these landslides are influencing the morphology of the local landscape and impacting the local sediment budget. Through DEM analyses and field surveying, we identify 97 landslides located on the slopes surrounding two small, hilltop towns. For landslides that are assumed to be active, the cumulative frequency distribution of landslide area above 10,000 m2 follows a power-law relationship. The mean slopes of the landslides (22%) and the study area (23%) are within one standard deviation of each other, suggesting the landslides are progressively decreasing the landscape gradient. We estimate the erosion rate due to landsliding to be 0.36 mm/yr. In comparison with the range of fluvial incision and erosion rates measured in other studies in the Apennine Mountains (0.17 mm/yr–2.2 mm/yr), the estimated erosion rate from landsliding is low but within the observed range from other similar locations. An analysis of curvature data show that landslide profiles have local concavities and convexities, but overall profile curvature varies around zero. The profile form could be related to the lithology and processes driving these landslides, but we do not have a mechanistic model to support this idea. Landslide planform shape is well constrained regardless of landslide area, however, there are differences in landslide morphology that may reflect landslide evolution. We determine that landslide shapes with high width standard deviations may be indicative of older landslides that are more heavily influenced by fluvial processes. We also suggest that those landslides with high width standard deviations and low minimum to maximum ratios are inactive. Finally, variations in landslide aspect ratio may be indicative of landslide evolution.
机译：这项研究量化了意大利南部亚平宁山脉东部缓慢移动的滑坡的形态，并探讨了它们如何促进当地景观的演变。我们的结果表明，这些滑坡正在影响当地景观的形态，并影响当地的泥沙预算。通过DEM分析和现场调查，我们确定了位于两个小山顶小镇周围的山坡上的97个滑坡。对于假定为活动的滑坡，10,000 m2以上的滑坡面积的累积频率分布遵循幂律关系。滑坡的平均坡度（22％）与研究区域的平均坡度（23％）在一个标准偏差之内，表明滑坡正在逐渐减小景观梯度。我们估计由于滑坡造成的侵蚀速率为0.36毫米/年。与亚平宁山脉其他研究中测得的河流切口和侵蚀速率范围（0.17 mm / yr–2.2 mm / yr）相比，滑坡的估算侵蚀速率较低，但在其他类似地点的观测范围内。对曲率数据的分析表明，滑坡剖面具有局部凹凸，但整体剖面曲率在零附近变化。剖面形式可能与驱动这些滑坡的岩性和过程有关，但是我们没有机械模型来支持这种想法。无论滑坡面积如何，滑坡的平面形状都受到很好的约束，但是，滑坡形态上的差异可能反映了滑坡的演化。我们确定具有高宽度标准偏差的滑坡形状可能表明较旧的滑坡受到河流过程的影响更大。我们还建议，那些具有高宽度标准偏差和最小与最大比率低的滑坡是不活跃的。最后，滑坡纵横比的变化可能表示滑坡的演化。

著录项

  • 作者

    Hoey, Heather.;

  • 作者单位

    Tulane University School of Science and Engineering.;

  • 授予单位 Tulane University School of Science and Engineering.;
  • 学科 Geomorphology.
  • 学位 M.S.
  • 年度 2012
  • 页码 100 p.
  • 总页数 100
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
  • 关键词

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