A multi-approach rockfall hazard assessment on a weathered granite natural rock slope

Pérez-Rey, Ignacio; Riquelme, Adrián; González-deSantos, Luis Miguel; Estévez-Ventosa, Xian; Tomás, Roberto; Alejano, Leandro R.

doi:10.1007/s10346-019-01208-5

Cited by 26 publications

(9 citation statements)

References 38 publications

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“…Shortly after the fire, a few new fragmented boulders were identified at the lower part of the slope (Figure 9b). A detailed study, briefly reported in what follows, has been published elsewhere [115].…”

Section: Galiciamentioning

confidence: 99%

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

et al. 2021

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Understanding processes and conditions that lead to rockfalls during and after a wildfire in different geological contexts is crucial since this phenomenon is one of the major hazards in mountainous regions across Europe. Spain is one of the European countries with the highest rate of wildfires, and rockfalls cause high economic and social impact, with many fatalities every year. The increase of rockfalls during and after wildfires is connected with the merging of different factors, not only in the detached area but also in the propagation and potentially affected area. When wildfire occurred, many actions take place: changes in the mechanical conditions of the rocks, the loss of protective capacity from vegetation, the effect induced by firefighting activities and/or the impact by the high temperatures in the adopted protective measures. After the wildfire, there is an increase in frequency and intensity of rockfalls in the burned area, causing a major impact of rockfalls on not only road networks and built-up areas but also people living. Additionally, the removal of vegetation by wildfires causes an increase in the risk perception, related not only to detached blocks but also to the general appearance of the rock mass. In this review, the main factors that influence the occurrence of rockfalls after a wildfire are analyzed, and three actual case studies in Spain are presented to support the variety of conclusions obtained.

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Section: Galiciamentioning

confidence: 99%

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

et al. 2021

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“…For each cliff segment, we conducted a kinematic analysis with Dips to obtain the probabilities for planar sliding, wedge sliding, and toppling using the cliff segments' average dip and dip directions and the identified joint sets at the cliffs. The probability of failure can be used as an indication of rockfall susceptibility at a given location, and similar approaches have been used by other authors (e.g., Matasci et al 2018;Pérez-Rey et al 2019). We analysed the number of joint sets that form critical intersections and identified critical sets on each cliff segment that can contribute to failures.…”

Section: Analysis Of Rock Mass Discontinuities and Rockfall Release Mechanismsmentioning

confidence: 99%

Rockfall susceptibility and runout in the Valley of the Kings

et al. 2021

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The UNESCO world heritage site Valley of the Kings or Wadi el-Moluk (وادي الملوك) near Luxor, Egypt, hosts unique burial places of Egyptian kings and royals from the New Kingdom (c. 1539–1075 BCE) and attracts about 0.5 to 2 million tourists per year. Very steep to subvertical cliffs of Thebes Limestone surround the Valley of the Kings. The rock mass is cut by frequent joints and faults making the cliff walls prone to rockfalls. However, only few rockfall debris are found in the valley, likely due to natural remobilisation by flood events and artificial clearings and excavation works that rendered the natural debris cover over the millennia. This work focuses on rockfall susceptibility and runout and makes use of new high-resolution landscape surface models utilising terrestrial laser scanning. We investigated rockfall release areas by exploring rock mass fractures at 23 cliff segments and analysed the kinematics of potential rockfalls. Furthermore, we estimated potential rockfall deposition areas with CONEFALL supported by nine numerical simulations of single rockfall events using Rockyfor3D. We found that nearly 4500 m2 (26%) of the public walking paths and 24 out of 64 tomb entrance areas locate within potential rockfall runout zones.

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“…Esto incluyó un estudio geotécnico clásico, datos meteorológicos y sísmicos y se obtuvo una nube de puntos muy detallada de toda la zona mediante la combinación de diferentes técnicas de detección remota (fotogrametría de dron y LiDAR). Además, a partir de la nube de puntos se realizó un análisis geoestructural semiautomático (Riquelme et al, 2014) que permitió obtener el tamaño de bloque medio de granito en la ladera, de en torno a 0.9 m 3 (Pérez-Rey et al, 2019a). Una vez que se disponía de dicha información, se realizó un reconocimiento de campo detallado donde se identificaron todos los bloques, conjuntos de bloques y zonas potencialmente inestables, así como la presencia de bloques caídos en el pasado.…”

Section: Ejemplounclassified

Natural instability phenomena in granitic rock masses: slopes in decomposed granite, boulder fields and irregular large granitic boulders

Alejano¹

2021

Bol. geol. min.

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RESUMENEn este artículo se presenta una revisión de los fenómenos de inestabilidad que se producen típicamente en laderas naturales en terrenos graníticos a partir de la experiencia acumulada por los autores, principalmente en el noroeste de la Península Ibérica, que se caracteriza además por un clima oceánico muy húmedo con precipitaciones elevadas. Para ello, se presenta en primer lugar un breve repaso introductorio de aspectos geomorfológicos de los terrenos graníticos en el que se definen diferentes morfologías de laderas que pueden dar lugar a fenómenos de inestabilidad y que incluyen grandes bolos graníticos individuales y con formas típicamente elipsoidales, campos de bolos graníticos en zonas de escarpe y laderas de pendiente alta o media y, finalmente, laderas suaves de materiales graníticos descompuestos, denominados localmente jabres. En todos estos casos, la meteorización de los materiales graníticos juega un papel relevante, por lo que se explica brevemente como se van meteorizando y erosionando los macizos rocosos graníticos. Posteriormente y para cada una de estas tres casuísticas, se presenta un descripción típica de los fenómenos a estudiar y mecanismos de inestabilidad característicos a los que dan lugar y que habrá que analizar, se introducen las técnicas de caracterización adecuadas y se define el tipo de análisis de estabilidad más apropiado para los mismos. Finalmente, se presenta de forma breve un caso de estudio para cada fenomenología de inestabilidad.

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A multi-approach rockfall hazard assessment on a weathered granite natural rock slope

Cited by 26 publications

References 38 publications

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

Rockfall susceptibility and runout in the Valley of the Kings

Natural instability phenomena in granitic rock masses: slopes in decomposed granite, boulder fields and irregular large granitic boulders

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