Debris-flow runout predictions based on the average channel slope (ACS)

Prochaska, Adam B.; Santi, Paul M.; Higgins, Jerry D.; Cannon, Susan H.

doi:10.1016/j.enggeo.2008.01.011

Cited by 83 publications

(33 citation statements)

References 26 publications

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“…Volume, elevation and channel slope have been used to estimate the total travel distance (Rickenmann 1999(Rickenmann , 2005 or have been determined on the basis of the average channel slope (Prochaska et al 2008). Volume balance criteria have been considered that delineate cross-sectional and inundated planimetric areas (Iverson et al 1998;Berti and Simoni 2007).…”

Section: Empiricalmentioning

confidence: 99%

Recommendations for the quantitative analysis of landslide risk

Corominas

Westen

Frattini

et al. 2013

Bull Eng Geol Environ

618

666

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This paper presents recommended methodologies for the quantitative analysis of landslide hazard, vulnerability and risk at different spatial scales (site-specific, local, regional and national), as well as for the verification and validation of the results. The methodologies described focus on the evaluation of the probabilities of occurrence of different landslide types with certain characteristics. Methods used to determine the spatial distribution of landslide intensity, the characterisation of the elements at risk, the assessment of the potential degree of damage and the quantification of the vulnerability of the elements at risk, and those used to perform the quantitative risk analysis are also described. The paper is intended for use by scientists and practising engineers, geologists and other landslide experts.

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Section: Empiricalmentioning

confidence: 99%

Recommendations for the quantitative analysis of landslide risk

Corominas

Westen

Frattini

et al. 2013

Bull Eng Geol Environ

618

666

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“…Empirical equations for the total travel distance (the entire horizontal path length) of debris flows were proposed by Corominas [1996], Rickenmann [1999], Legros [2002], Toyos et al [2008], and Prochaska et al [2008]. In most of these approaches the runout length is essentially a function of the volume and angle of reach or the longitudinal profile of the expected flow path.…”

Section: Flow Modelling and Runout Prediction On The Fanmentioning

confidence: 99%

Debris-Flow Hazard Assessment and Methods Applied in Engineering Practice

Rickenmann

2016

IJECE

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Debris flows constitute a major natural hazard in mountainous regions. The main elements required for a practical hazard assessment include the following steps: (i) estimation of potential initiation zones and sediment sources, (ii) establishment of a relation between the magnitude and frequency of expected future debris-flow events, and (iii) assessment of the flow behavior and delineation of areas potentially endangered by flowing debris. A general overview is presented of the main triggering conditions and initiation mechanisms for debris-flow formation. A brief summary is given of methods to establish a magnitude-frequency relation and to estimate the total volume of sediments transported to the fan during so-called "design" events. To assess the runout distance of debris flows and potentially affected areas, either simple empirical approaches or more physically based numerical simulation models may be used. An example application for a Swiss debris fan illustrates the variability of the results when using three different debris-flow simulation models, even though all three models were first calibrated based on the observed deposition areas of a past event.

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“…Several efforts have been made to develop relationships to estimate the angle of reach, mainly using the volume of the debris flow. The minimum angle of reach that has been observed is 6.5 • (ratio H /L = 0.11) (Prochaska et al, 2008), and the highest and more repetitive is 11 • (ratio H /L = 0.19) (Rickenmann, 1999;Huggel and Kääb, 2003;Rickenmann and Zimmermann, 1993;Kappes et al, 2011). The two angles were used to test the sensitivity of the results, but larger and more fluid debris flows may show lower H /L ratios and consequently a larger flow reach.…”

Section: Development Of the Morphometric Indicatormentioning

confidence: 99%

Regional debris flow susceptibility analysis in mountainous peri-urban areas through morphometric and land cover indicators

Rogelis

Werner

2014

Nat. Hazards Earth Syst. Sci.

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Abstract.A method for assessing regional debris flow susceptibility at the watershed scale, based on an index composed of a morphometric indicator and a land cover indicator, is proposed and applied in 106 peri-urban mountainous watersheds in Bogotá, Colombia. The indicator of debris flow susceptibility is obtained from readily available information common to most peri-urban mountainous areas and can be used to prioritise watersheds that can subsequently be subjected to detailed hazard analysis. Susceptibility is considered to increase with flashiness and the possibility of debris flows occurring. Morphological variables recognised in the literature to significantly influence flashiness and occurrence of debris flows are used to construct the morphometric indicator by applying principal component analysis. Subsequently, this indicator is compared with the results of debris flow propagation to assess its capacity in identifying the morphological conditions of a watershed that make it able to transport debris flows. Propagation of debris flows was carried out using the Modified Single Flow Direction algorithm, following identification of source areas by applying thresholds identified in the slope-area curve of the watersheds. Results show that the morphometric variables can be grouped into four indicators: size, shape, hypsometry and (potential) energy, with energy being the component that best explains the capability of a watershed to transport debris flows. However, the morphometric indicator was found to not sufficiently explain the records of past floods in the study area. Combining the morphometric indicator with land cover indicators improved the agreement and provided a more reliable assessment of debris flow susceptibility in the study area. The analysis shows that, even if morphometric parameters identify a high disposition to the occurrence of debris flow, improving land cover can reduce the susceptibility. However, if favourable morphometric conditions are present but deterioration of the land cover in the watershed takes place, then the susceptibility to debris flow events increases. The indicator of debris flow susceptibility is useful in the identification of flood type, which is a crucial step in flood risk assessment especially in mountainous environments, and it can be used as input for prioritisation of flood risk management strategies at regional level and for the prioritisation and identification of detailed flood hazard analysis. The indicator is regional in scope, and therefore it is not intended to constitute a detailed assessment but to highlight watersheds that could potentially be more susceptible to damaging floods than others in the same region.

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Debris-flow runout predictions based on the average channel slope (ACS)

Cited by 83 publications

References 26 publications

Recommendations for the quantitative analysis of landslide risk

Recommendations for the quantitative analysis of landslide risk

Debris-Flow Hazard Assessment and Methods Applied in Engineering Practice

Regional debris flow susceptibility analysis in mountainous peri-urban areas through morphometric and land cover indicators

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