Correlation between rockfall frequency and overhang geometrical attributes

IF 5.8 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Landslides Pub Date : 2024-05-02 DOI:10.1007/s10346-024-02259-z

Olga Mavrouli, M. Amparo Núñez-Andrés, Felipe Buill, Nieves Lantada, Jordi Corominas

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Abstract

The estimation of rockfall frequency for the quantitative assessment of rockfall hazard is challenging when there are not records of previous events. The aim of this study is to investigate the correlation between the rockfall frequency and the geometry of the overhanging rock blocks, at rocky slopes. The investigation takes place for seven rocky slopes along a coastal road in Northern Spain, and it is based on 15 years of rockfall data. A field survey of these slopes took place between May and June 2022, using a terrestrial laser scanner as well as ground and aerial photogrammetry from UAVs, in order to build three-dimensional digital models. Then, the geometrical attributes of the existing overhanging rocks were measured on the models. The surface area and the width of the latter were calculated. The correlation between the rockfall frequency and the sum of the overhanging areas at each slope was assessed. A good linear correlation was indicated between the normalized per slope area number of rockfalls and total overhang area (R² = 0.9013) and between the respective normalized per unit of road length parameters (R² = 0.9594). The magnitude-frequency relationship for the rockfall events that occurred at the seven slopes follows a power law distribution with exponent −0.65.

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落石频率与悬臂几何属性之间的相关性

在没有以往事件记录的情况下，为定量评估落石危险而估算落石频率是一项挑战。本研究的目的是调查岩石斜坡的落石频率与悬挂岩块几何形状之间的相关性。研究以 15 年的落石数据为基础，对西班牙北部沿海公路沿线的七个岩石斜坡进行了调查。2022 年 5 月至 6 月期间，使用地面激光扫描仪以及无人机进行地面和空中摄影测量，对这些斜坡进行了实地勘测，以建立三维数字模型。然后，在模型上测量了现有悬岩的几何属性。计算了悬岩的表面积和宽度。评估了每个斜坡的落石频率与悬岩面积总和之间的相关性。结果表明，每个斜坡面积上的正常化落石数量与总悬挂面积（R2 = 0.9013）之间，以及单位道路长度上的正常化参数（R2 = 0.9594）之间存在良好的线性相关关系。在七个斜坡上发生的落石事件的大小-频率关系呈幂律分布，指数为-0.65。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Landslides 地学-地球科学综合

CiteScore

13.60

自引率

14.90%

发文量

191

审稿时长

>12 weeks

期刊介绍： Landslides are gravitational mass movements of rock, debris or earth. They may occur in conjunction with other major natural disasters such as floods, earthquakes and volcanic eruptions. Expanding urbanization and changing land-use practices have increased the incidence of landslide disasters. Landslides as catastrophic events include human injury, loss of life and economic devastation and are studied as part of the fields of earth, water and engineering sciences. The aim of the journal Landslides is to be the common platform for the publication of integrated research on landslide processes, hazards, risk analysis, mitigation, and the protection of our cultural heritage and the environment. The journal publishes research papers, news of recent landslide events and information on the activities of the International Consortium on Landslides. - Landslide dynamics, mechanisms and processes - Landslide risk evaluation: hazard assessment, hazard mapping, and vulnerability assessment - Geological, Geotechnical, Hydrological and Geophysical modeling - Effects of meteorological, hydrological and global climatic change factors - Monitoring including remote sensing and other non-invasive systems - New technology, expert and intelligent systems - Application of GIS techniques - Rock slides, rock falls, debris flows, earth flows, and lateral spreads - Large-scale landslides, lahars and pyroclastic flows in volcanic zones - Marine and reservoir related landslides - Landslide related tsunamis and seiches - Landslide disasters in urban areas and along critical infrastructure - Landslides and natural resources - Land development and land-use practices - Landslide remedial measures / prevention works - Temporal and spatial prediction of landslides - Early warning and evacuation - Global landslide database