Technical Note: Preliminary estimation of rockfall runout zones

Jaboyedoff, Michel; Labiouse, V.

doi:10.5194/nhess-11-819-2011

Cited by 110 publications

(85 citation statements)

References 25 publications

(52 reference statements)

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“…A successful application to rockfall is presented in Michoud et al (2012) by using the SFLM approach. This algorithm has similarities with the CONEFALL method (Jaboyedoff and Labiouse, 2011), and resulted in quite similar zonation, sometimes even more realistic due to better integration of the topography. Block release frequencies were first assessed and then propagated with Flow-R to result, after calibration, in a regional hazard map for rockfall.…”

Section: Application Of Flow-r To Other Phenomenamentioning

confidence: 99%

Flow-R, a model for susceptibility mapping of debris flows and other gravitational hazards at a regional scale

Horton

Jaboyedoff

Rudaz

et al. 2013

Nat. Hazards Earth Syst. Sci.

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202

267

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Abstract. The development of susceptibility maps for debris flows is of primary importance due to population pressure in hazardous zones. However, hazard assessment by process-based modelling at a regional scale is difficult due to the complex nature of the phenomenon, the variability of local controlling factors, and the uncertainty in modelling parameters. A regional assessment must consider a simplified approach that is not highly parameter dependant and that can provide zonation with minimum data requirements. A distributed empirical model has thus been developed for regional susceptibility assessments using essentially a digital elevation model (DEM). The model is called Flow-R for Flow path assessment of gravitational hazards at a Regional scale (available free of charge under http://www.flow-r.org) and has been successfully applied to different case studies in various countries with variable data quality. It provides a substantial basis for a preliminary susceptibility assessment at a regional scale. The model was also found relevant to assess other natural hazards such as rockfall, snow avalanches and floods. The model allows for automatic source area delineation, given user criteria, and for the assessment of the propagation extent based on various spreading algorithms and simple frictional laws. We developed a new spreading algorithm, an improved version of Holmgren's direction algorithm, that is less sensitive to small variations of the DEM and that is avoiding over-channelization, and so produces more realistic extents. The choices of the datasets and the algorithms are open to the user, which makes it compliant for various applications and dataset availability. Amongst the possible datasets, the DEM is the only one that is really needed for both the source area delineation and the propagation assessment; its quality is of major importance for the results accuracy. We consider a 10 m DEM resolution as a good compromise between processing time and quality of results. However, valuable results have still been obtained on the basis of lower quality DEMs with 25 m resolution.

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Section: Application Of Flow-r To Other Phenomenamentioning

confidence: 99%

Flow-R, a model for susceptibility mapping of debris flows and other gravitational hazards at a regional scale

Horton

Jaboyedoff

Rudaz

et al. 2013

Nat. Hazards Earth Syst. Sci.

Self Cite

202

267

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“…Massa tanah yang bergerak hanya dipengaruhi oleh gaya gravitasi dan gaya gesek bidang gelincir statis [11]. GAMBAR 3.…”

Section: Metode Penelitianunclassified

STUDI PARAMETRIK PENGARUH POLA CURAH HUJAN terhadap JARAK JANGKAUAN (RUN-OUT) LONGSOR di LEMBANG-BANDUNG

Khoiriyah

Feranie

Tohari

2016

SPEKTRA

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AbstrakLongsor termasuk bencana alam yang sering terjadi di Jawa Barat. Banyak penelitian mengenai longsor. Salah satu penelitian didasarkan pada faktor penting pemicu terjadinya longsor yaitu pola curah hujan. Penelitian dilakukan di Lembang-Bandung sebagai daerah berpotensi longsor dengan menggunakan metode geologi teknik berupa uji karakteristik keteknikan tanah. Hasil dari karakterisasi keteknikan tanah berupa distribusi ukuran butir, porositas, permeabilitas, kohesi, dan dengan dilengkapi geometri lereng potensi longsor digunakan untuk mengidentifikasi besaran yang digunakan untuk mengetahui jarak jangkauan (run-out) longsor berdasarkan model gesekan Coloumb sederhana. Perubahan pola curah hujan yang dilakukan yaitu 0 mm/jam, 0,1 mm/jam, 5 mm/jam, 10 mm/jam, 20 mm/jam, dan 25 mm/jam menghasilkan stabilitas lereng (baca: faktor keamanan) yang berbeda-beda. Pola hujan ringansedang menunjukan bahwa lereng berada dalam keadaan kritis dengan FK ~1,001 sedangkan saat hujan lebat -sangat lebat menunjukan lereng berada dalam keadaan tidak stabil dengan FK< 1. Hal ini berpengaruh pada run-out longsor beserta kecepatan tanah. Semakin tinggi tingkat curah hujan maka lereng akan semakin tidak stabil sehingga tinggi awal pusat massa berubah menjadi lebih tinggi maka run-out longsor dan kecepatan pun semakin tinggi.Kata-kata kunci: Pola Curah Hujan, Faktor Keamanan, Jarak Jangkauan (Run-Out) AbstractLandslide is one of the most frequent natural disasters in West Java. There is a lot of research conducted under landslides discussion. One of the researches was conducted based on one of the important factors that trigger landslides that is rainfall patterns. The research was conducted in Lembang, Bandung as it is an area potentially having landslide. The method used was geological method particularly using engineering characteristic such as the soil test. The results of engineering characterization of soil are in the form of grain size distribution, porosity, permeability, and cohesion. It is completed by potential landslide slope geometry in order to identify the unit used to determine the run-out of the landslide based on the friction model of simple Coulomb. Changes in rainfall patterns made is 0 mm/h, 0.1 mm/h, 5 mm/h, 10 mm/h, 20 mm/h, and 25 mm/h resulting different intensity of slope stability (read: safety factor). That are light-medium rainfall pattern then the value FK ~ 1.001, while heavy-torrential rainfall pattern then the value FK <1. It affects the run-out landslides including the ground speed. The higher of the rainfall level, the lower of the slope stability will be, It increases initial high center of mass and also resulting the higher of the run-out of landslides and it speed.

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“…In the last few decades several papers have been based on this approach (e.g. Copons et al 2009;Jaboyedoff, Labiouse 2011;Blahůt et al 2013) and the typical value of the shadow angle is around 27° (Copons et al 2009). …”

Section: Shadow and Reach Angle Models As Tools To Determine The Extementioning

confidence: 99%

“…CONEFALL locates the rockfall propagation zone within the area that is delimited by the intersection of the energy line with the slope surface. Jaboyedoff and Labiouse (2011) have reviewed the theoretical backgrounds of CONEFALL operation. In this study, high-resolution DEM based on the airborne LiDAR was used as the input data.…”

Section: Estimation Of the Position Of Sandstone Bouldersmentioning

confidence: 99%

The origin of sandstone boulder aprons along the escarpments of the Stołowe Mountains: are they all rockfall-derived? A new insight into an old problem using the CONEFALL 1.0 software

Duszyński

Migoń

2015

Bulletin of Geography. Physical Geography Series

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Abstract.A characteristic feature of sandstone-capped escarpments in the Stołowe Mountains is the occurrence of extensive boulder mantles which extend from the rock face to the footslope over distances of 300-500 m. The hypothesis implying rockfall as the process of boulder release from the rock face and subsequent transport is tested by means of Conefall 1.0 software, designed to simulate run-out zones of rockfalls. The actual extent of boulder mantles is much larger than the simulated extent, which casts doubt on the applicability of rockfall scenario. Alternative hypotheses are briefly discussed and it is concluded that a similar morphological effect can be achieved by in situ caprock disintegration and sub-caprock slope lowering and retreat.

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Technical Note: Preliminary estimation of rockfall runout zones

Cited by 110 publications

References 25 publications

Flow-R, a model for susceptibility mapping of debris flows and other gravitational hazards at a regional scale

Flow-R, a model for susceptibility mapping of debris flows and other gravitational hazards at a regional scale

STUDI PARAMETRIK PENGARUH POLA CURAH HUJAN terhadap JARAK JANGKAUAN (RUN-OUT) LONGSOR di LEMBANG-BANDUNG

The origin of sandstone boulder aprons along the escarpments of the Stołowe Mountains: are they all rockfall-derived? A new insight into an old problem using the CONEFALL 1.0 software

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