Experimental Study on the Parameters That Cause River-Blocking by Debris Flow

Guo, Zhixue; Huang, Er; Liu, Xingnian; Cao, Shuyou

doi:10.1007/978-3-540-75999-7_51

Cited by 6 publications

(9 citation statements)

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“…However, no effective criterion has yet been established to judge whether a landslide dam forms. In previous studies (Dang et al 2009, Guo et al 2004, the time length of river blockage was used to evaluate whether a landslide dam forms. For example, Guo et al (2004) assumed that if the time length of river blockage was more than 3 s, a landslide dam might form in the laboratory-scale experiment.…”

Section: Evolution Process Of River Blockingmentioning

confidence: 99%

“…Despite the fact that previous laboratory experiments were commonly used to investigate the mechanism of landslide dam breaks with manually prebuilt earth-rock dams (Chen et al 2015;Davies et al 2007;Gregoretti et al 2010;Niu et al 2012), very few studies have modeled the evolution process of river blocking. Although a few experimental studies on the formation conditions of landslide dams triggered by mud or debris flow have been reported (Dang et al 2009, Guo et al 2004), the applicability of those studies for non-cohesive landslide masses might need to be further examined because the evolution process of river blocking is entirely different among various landslide materials (Liao et al 2019), such as rock, gravel, and clay.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the formation process of landslide dams and a criterion of river blockage

Nian

et al. 2020

Landslides

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River blocking caused by landslide dams is a common geological disaster in mountainous regions worldwide, threatening the safety of human lives and infrastructure. However, studies on the formation process of landslide dams and the criteria of river blockage are still at an early stage. This paper built a laboratoryscale experimental apparatus for simulating the formation and evolution process of landslide dams, and then carried out a total of 29 experiments. It analyzed the common evolution stages of river blocking, including landslides, dam formation, and dam breaching in detail. Then, we investigated the influences of the landslide volume, the landslide discharge, and the water flow rate on a criterion and the time length of river blockage. The experimental results suggest that the formation condition of a landslide dam is related to the ratio of the landslide discharge to the water flow rate. Based on this understanding, we proposed a dimensionless River Blockage Criterion (RBC) to judge the formation of landslide dams. The criterion indicates that when RBC > 1.5, a landslide dam may form; otherwise, a landslide dam may not form. Additionally, the time length of river blockage was found to be related to the landslide volume and the water flow rate. Subsequently, we proposed a model for predicting the time length of river blockage and verified it by the 29 experimental results. The Baige River-blocking event, which occurred on the Jinsha River, China, in 2018, was used as a case study to further verify the RBC and the proposed model. The results show that the proposed RBC agreed well with reality, and the percentage difference between the calculated and the actual time length of river blockage was 11%. The findings of this study could contribute to the early warning and emergency response of river-blocking disasters.

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Section: Evolution Process Of River Blockingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the formation process of landslide dams and a criterion of river blockage

Nian

et al. 2020

Landslides

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“…Many researches on predictive method for debris flow blocking river were conducted [1][2][9][10][11][12][13] . But these predictive models have no universality because of too many factors to consider.…”

Section: Analysis Of River Blocked By Debris Flowmentioning

confidence: 99%

“…The deposition range is determined by debris flow scales and local channel conditions [1] . If a debris flow scale is enough big while main riverway is narrow, the debris flow could block the main river [2] . There are many reports on debris flow blocking river events in mountain areas [3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Transport Characteristics and River-Blocking Possibilities of Debris Flows in Namudang Gully, Lhoka Prefecture of Tibet, China

Chen¹,

Chen²,

You³

et al. 2012

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering

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Predicting the possibilities of river blocked by debris flow is critical for disaster prevention and mitigation. In this paper, taking Namudang gully in Sangri County, Lhoka Prefecture of Tibet as an example, we studied the characteristics and analysed the riverblocking possibilities of debris flows in the gully based on field survey and laboratory tests. Results showed the debris flow was viscose debris flow with densities of 2.0 g/cm 3 , 2.1 g/cm 3 and 2.2 g/cm 3 at 20-year, 50-year and 100-year recurrence intervals, respectively. And the corresponding debris flow discharges were 69.39m 3 /s, 105.71m 3 /s and 150.72m 3 /s, respectively. On this basis, we used Ratio of Discharge per Unit Width to predict the possibilities of river blocked by debris flows in the gully. Calculating results showed that, at 20-year recurrence intervals, debris flow do not block the river, only resulting in contraction of channel cross-section, and however, at 50-year and 100-year recurrence intervals, debris flows will block Qusong River. The results agreed with the field survey, which meant the "Ratio of Discharge per Unit Width" is feasible for predicting the possibilities of river blocked by debris flows.

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“…In 1991, the relationship between channel conditions and river blocking was theoretically investigated [14]. The entry angle, discharge ratio to the main stream, and volumes of debris entering into the main stream proved to be important factors for the formation of river blockings [15,16]. In order to measure the extent of river blocking, the runout momentum of debris flow as nondimensional factor was chosen [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of River Blocking Induced by a Debris Flow

et al. 2017

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many coseismic landslides along the Nanya River in Shimian City. Subsequent debris flows that initiated from these landslides and are triggered by intense rainfall become the secondary hazard in the years after the earthquake; in particular, some debris flows led to a serious river blocking event. For example, the Guangyuanbao debris flow which occurred on July 04, 2013, partly blocked the Nanya River, presenting a major threat to the national highway and residential areas. To analyze the pattern of landslide damming, we analyzed numerical simulations of the movement characteristics of the Guangyuanbao debris flow using rainfall intensities with varying recurrence periods of 5, 20, and 50 years. The accuracy of the spreading of the numerical simulation is about 90%. The simulation indicated a small volume of sediment entering the river for a rainfall under 5-year return period. A debris flow induced by rainfall under 20-year return period partly blocked the river, while rainfall under 50-year return period has potential to block the river completely. This proposed analysis of river blocking induced by a debris flow could be used for disaster prevention in earthquake-stricken area.

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Experimental Study on the Parameters That Cause River-Blocking by Debris Flow

Cited by 6 publications

References 0 publications

Experimental investigation on the formation process of landslide dams and a criterion of river blockage

Experimental investigation on the formation process of landslide dams and a criterion of river blockage

Transport Characteristics and River-Blocking Possibilities of Debris Flows in Namudang Gully, Lhoka Prefecture of Tibet, China

Analysis of River Blocking Induced by a Debris Flow

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