Debris flow erosion and deposition in Jiangjia Gully, Yunnan, China

Chen, J.; He, Yi; Feng, Wei

doi:10.1007/s00254-005-0017-z

Cited by 33 publications

(25 citation statements)

References 7 publications

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“…This self-sustaining effect partly explains the high rate of volume increase observed in many debris flows and is probably often necessary to achieve long runouts in subaerial debris flows. Chen et al (2005) also found that the magnitude of the debris flow event has a crucial influence on erosion and deposition processes; deposition in the channel increases with increasing flow volume until a certain magnitude is reached, initiating erosion. According to Lorenzini and Mazza (2004), debris flows with volumes greater than 10 5 m 3 show a net increase in the ratio (L/H) between the runout and the fall height, which increases in proportion to the logarithm of the volume.…”

Section: The Importance Of Volumementioning

confidence: 94%

Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western Norway

et al. 2008

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Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western NorwayAbstract This article documents a 240,000-m 3 debris flow resulting from a glacial lake outburst flood in Fjaerland, Western Norway, May 8, 2004. The event started when a glacial lake breached a moraine ridge. The ensuing debris flow was able to erode material along its path, increasing in volume from about 25,000 to 240,000 m 3 before depositing about 3 km from its starting point. Field investigations, pre-and post-flow aerial photographs as well as airborne laser scanning (LIDAR) were used to describe and investigate the flow. The most striking and unusual feature of this case study is the very pronounced erosion and bulking. We have made a detailed study of this aspect. Erosion and entrainment is quantified and the final volume of the debris flow is determined. We also present geometrical and sedimentological features of the final deposit. Based on the Fjaerland data, we suggest that a selfsustaining mechanism might partly explain the extreme growth of debris flows traversing soft terrain.

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Section: The Importance Of Volumementioning

confidence: 94%

Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western Norway

et al. 2008

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“…They have similar geological and environmental conditions. Detailed information can be found in Chen [45] and Cui [46]. Dozens of debris flow occur in the JJG every year.…”

Section: Data Acquisitionmentioning

confidence: 99%

An Approach to Predict Debris Flow Average Velocity

Cao

Song

Chen

et al. 2017

Water

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Debris flow is one of the major threats for the sustainability of environmental and social development. The velocity directly determines the impact on the vulnerability. This study focuses on an approach using radial basis function (RBF) neural network and gravitational search algorithm (GSA) for predicting debris flow velocity. A total of 50 debris flow events were investigated in the Jiangjia gully. These data were used for building the GSA-based RBF approach (GSA-RBF). Eighty percent (40 groups) of the measured data were selected randomly as the training database. The other 20% (10 groups) of data were used as testing data. Finally, the approach was applied to predict six debris flow gullies velocities in the Wudongde Dam site area, where environmental conditions were similar to the Jiangjia gully. The modified Dongchuan empirical equation and the pulled particle analysis of debris flow (PPA) approach were used for comparison and validation. The results showed that: (i) the GSA-RBF predicted debris flow velocity values are very close to the measured values, which performs better than those using RBF neural network alone; (ii) the GSA-RBF results and the MDEE results are similar in the Jiangjia gully debris flow velocities prediction, and GSA-RBF performs better; (iii) in the study area, the GSA-RBF results are validated reliable; and (iv) we could consider more variables in predicting the debris flow velocity by using GSA-RBF on the basis of measured data in other areas, which is more applicable. Because the GSA-RBF approach was more accurate, both the numerical simulation and the empirical equation can be taken into consideration for constructing debris flow mitigation works. They could be complementary and verified for each other.

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“…En este caso, el tipo de evento de remoción de masa se denomina flujo hiperconcentrado de detritos. Existen algunas investigaciones en donde se analiza la dinámica de este tipo de movimientos de remoción de masa (Iverson, 1997;Chen y Lee, 2000;Fraccarollo y Papa, 2000;Denlinger e Iverson, 2001;Chen et al, 2005, Naef et al, 2006Rosatti y Fraccarollo, 2006;Bateman et al, 2007;Mambretti et al, 2008;Wang et al, 2008). En particular, Iverson (1997), en su excelente revisión menciona que la mayoría de las investigaciones que estudian este tipo de fenómenos consideran condiciones de flujo uniforme y estacionario, lo cual lleva a conclusiones que lejanamente se aproximan a las situaciones observadas en este tipo de eventos.…”

Section: Introductionunclassified

Determinación del esfuerzo de cedencia para suelos vulnerables a movimientos de remoción de masa originados por las lluvias

Méndez-Sánchez¹,

Pérez-Trejo²,

Sánchez-Cruz³

et al. 2011

BSGM

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Esfuerzo de cedencia para suelos vulnerables a movimientos de remoción de masa originados por las lluvias 345 ResumenEn el presente trabajo se estudia el esfuerzo de cedencia en función del contenido de agua para suelos propensos a flujos de detritos debido a las lluvias. El esfuerzo de cedencia es calculado de la relación y metodología propuesta por Pashias et al. (1996), a partir de una prueba de asentamiento en geometría cilíndrica. La ventaja de emplear este método es que la determinación del esfuerzo de cedencia se realiza de manera fácil y rápida. Incluso, se puede realizar in situ en la zona susceptible a movimientos de remoción de masa. Se presentan resultados de la variación del esfuerzo de cedencia en función del contenido de agua para la zona del cerro de Xico localizada en Valle de Chalco, Estado de México, la cual es considerada como vulnerable a deslaves por las autoridades locales.Palabras clave: Esfuerzo de cedencia, movimientos de remoción de masa, prueba de asentamiento. AbstractYield stress as a function of water content for soils prone to debris flows due to rain is studied in this work. Yield stress is calculated by the slump test in cylindrical geometry by using the relation proposed by Pashias et al. (1996)

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Debris flow erosion and deposition in Jiangjia Gully, Yunnan, China

Cited by 33 publications

References 7 publications

Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western Norway

Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western Norway

An Approach to Predict Debris Flow Average Velocity

Determinación del esfuerzo de cedencia para suelos vulnerables a movimientos de remoción de masa originados por las lluvias

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