Quantitative assessment of diffuse rock fall hazard along a cliff foot

Hantz, Didier

doi:10.5194/nhess-11-1303-2011

Cited by 36 publications

(33 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 10 presents cumulative magnitude-frequency relationships derived from the clustering analysis of both the filled and unfilled models. The form of the magnitude-frequency relationships are similar to those derived for other rock slopes (e.g., [57,58]), and include characteristic "rollover" for small volumes as well as linearity in log-log space across several orders of magnitude of volume. The rollover phenomenon in landslide magnitude-frequency relationships has been attributed to data censuring that occurs when survey resolutions are approached [59].…”

Section: Study Site Asupporting

confidence: 57%

To Fill or Not to Fill: Sensitivity Analysis of the Influence of Resolution and Hole Filling on Point Cloud Surface Modeling and Individual Rockfall Event Detection

et al. 2015

View full text Add to dashboard Cite

Monitoring unstable slopes with terrestrial laser scanning (TLS) has been proven effective. However, end users still struggle immensely with the efficient processing, analysis, and interpretation of the massive and complex TLS datasets. Two recent advances described in this paper now improve the ability to work with TLS data acquired on steep slopes. The first is the improved processing of TLS data to model complex topography and fill holes. This processing step results in a continuous topographic surface model that seamlessly characterizes the rock and soil surface. The second is an advance in the automated interpretation of the surface model in such a way that a magnitude and frequency relationship of rockfall events can be quantified, which can be used to assess maintenance strategies and forecast costs. The approach is applied to OPEN ACCESSRemote Sens. 2015, 7 12104 unstable highway slopes in the state of Alaska, U.S.A. to evaluate its effectiveness. Further, the influence of the selected model resolution and degree of hole filling on the derived slope metrics were analyzed. In general, model resolution plays a pivotal role in the ability to detect smaller rockfall events when developing magnitude-frequency relationships. The total volume estimates are also influenced by model resolution, but were comparatively less sensitive. In contrast, hole filling had a noticeable effect on magnitudefrequency relationships but to a lesser extent than modeling resolution. However, hole filling yielded a modest increase in overall volumetric quantity estimates. Optimal analysis results occur when appropriately balancing high modeling resolution with an appropriate level of hole filling.

show abstract

Section: Study Site Asupporting

confidence: 57%

To Fill or Not to Fill: Sensitivity Analysis of the Influence of Resolution and Hole Filling on Point Cloud Surface Modeling and Individual Rockfall Event Detection

et al. 2015

View full text Add to dashboard Cite

show abstract

“…vehicles, buildings) is a rare event that can be ascribed to a Poisson process. Similarly, Lari et al (2014) and Hantz and colleagues (Hantz et al, 2003;Hantz, 2011) invoke the same assumption. The GPD has been chosen for fitting the values of list F for various reasons.…”

Section: Discussionmentioning

confidence: 74%

Estimation of the return period of rockfall blocks according to their size

Biagi

Napoli

Barbero

et al. 2017

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. With reference to the rockfall risk estimation and the planning of rockfall protection devices, one of the most critical and most discussed problems is the correct definition of the design block by taking into account its return period. In this paper, a methodology for the assessment of the design block linked with its return time is proposed and discussed, following a statistical approach. The procedure is based on the survey of the blocks that were already detached from the slope and had accumulated at the foot of the slope in addition to the available historical data.

show abstract

“…Hantz (2011) uses a risk calculation, where the block size varies according to a power law, and the target dimension is set to 0.5 m, corresponding to a hiker's "length". Michoud et al (2012) also use the dimensions of the cars (4 m) and of the falling rocks.…”

Section: Methods Considering An Impact On the Side Of The Vehiclementioning

confidence: 99%

“…The passengers' "length" could also be added to the event's width in this equation, similarly to the addition of the event's width to the vehicle's length in P ST (Eq. 8) or to the hiker's length in Hantz (2011), to account for the fact that a passenger with a geometric centre close to the path of the falling mass could actually be partly on its path. This is however a detail with respect to the fact that this last equation does not take the potential derailment of the train into account (see Cloutier, 2014), which could affect the passengers on a section of the train longer than the section directly affected by the falling material.…”

Section: P Nicolet Et Al: Direct Impact Probability Of Landslides Omentioning

confidence: 99%

Brief communication: On direct impact probability of landslides on vehicles

Nicolet

Jaboyedoff

Cloutier³

et al. 2016

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. When calculating the risk of railway or road users of being killed by a natural hazard, one has to calculate a temporal spatial probability, i.e. the probability of a vehicle being in the path of the falling mass when the mass falls, or the expected number of affected vehicles in case such of an event. To calculate this, different methods are used in the literature, and, most of the time, they consider only the dimensions of the falling mass or the dimensions of the vehicles. Some authors do however consider both dimensions at the same time, and the use of their approach is recommended. Finally, a method considering an impact on the front of the vehicle is discussed.

show abstract

Quantitative assessment of diffuse rock fall hazard along a cliff foot

Cited by 36 publications

References 15 publications

To Fill or Not to Fill: Sensitivity Analysis of the Influence of Resolution and Hole Filling on Point Cloud Surface Modeling and Individual Rockfall Event Detection

To Fill or Not to Fill: Sensitivity Analysis of the Influence of Resolution and Hole Filling on Point Cloud Surface Modeling and Individual Rockfall Event Detection

Estimation of the return period of rockfall blocks according to their size

Brief communication: On direct impact probability of landslides on vehicles

Contact Info

Product

Resources

About