Prediction of Floods Caused by Landslide Dam Collapse

Satofuka, Yoshifumi; Mōri, Toshio; Mizuyama, Takahisa; Ogawa, Kiyohisa; Yoshino, Kousuke

doi:10.20965/jdr.2010.p0288

Cited by 22 publications

(12 citation statements)

References 6 publications

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“…A LADOF model is a one-dimensional simulation model that treats a transitional flow including debris flow, hyperconcentrated flow and bedload transport integrally as a two-phase flow [Satofuka et al, 2007a]. In the model, flow is divided into two phases: a water flow phase and a mixture of water and sediment flow phase, and each phase is analyzed by the respective equations of continuity and momentum considering mass and volume flux through the interface between the two phases [Takahama et al, 2000].…”

Section: Outline Of the Ladof Modelmentioning

confidence: 99%

“…In the model, flow is divided into two phases: a water flow phase and a mixture of water and sediment flow phase, and each phase is analyzed by the respective equations of continuity and momentum considering mass and volume flux through the interface between the two phases [Takahama et al, 2000]. The channel bank erosion rate has been introduced based on an idea that the erosion rate is proportional to the first root of the flow velocity [Satofuka et al, 2007a]. Based on this, we consider the process of overflow and outbreak of a landslide dam in the calculation, in which erosion in the longitudinal direction and the transverse direction (bank erosion) occur simultaneously, gradually widening the channel.…”

Section: Outline Of the Ladof Modelmentioning

confidence: 99%

“…One of the techniques for predicting damage is to determine the peak discharge statistically based on past data [Costa and Shuster, 1988]. A numerical simulation model that considers the overflow and erosion process of landslide dams has recently been made available for practical use [Satofuka et al, 2007a]. The area of damage was estimated using a numerical simulation model for landslide dams caused by typhoon Talas in the Kii Peninsula in 2011, and the results were disseminated to local governments for warnings and evacuations in the estimated areas [Ishizuka and Osanai, 2012].…”

Section: Introductionmentioning

confidence: 99%

“…Other researches has verified by actual landslide disasters [Takahashi and Nakagawa, 1993;Satofuka et al, 2007a]. However, since the frequency of landslide dam occurrence is not high, cases of verification using actual phenomena are limited.…”

Section: Introductionmentioning

confidence: 99%

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Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia

Ishizuka

Kaji²,

Morita

et al. 2017

IJECE

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In July 2012, a landslide dam subsequent to the large-scale collapse of a mountain edifice occurred on Ambon Island in the eastern part of Indonesia. A height of the dam was approximately 140 m and a volume of dammed water was approximately 250 million m 3 . The dam failed about a year after its formation in July 2013, and a large-scale flood wreaked havoc on the downstream area. In this disaster, the information on the topographic changes before and after the dam failure was obtained from digital maps (DEM) based on satellite images and field measurement. Furthermore, field surveys examined the various conditions of the sites around the landslide dam and a process of the outburst flood was recorded on video. Simulation of a landslide dam outburst flood was conducted using LADOF model that reproduces the process of overflow and erosion of a landslide dam outbreak and the calculation result was verified by field measurement data. The results are as follows. (1)The peak flow rate of the landslide dam outburst flood determined by simulation was approximately 17,000 m 3 /s. (2)The occurrence and duration of the flood, longitudinal profile of the dam, inundated area and flow depth obtained from the simulation almost agree with the actual results obtained from field measurement. (3)The phenomena whereby the progress of longitudinal erosion caused the collapse of the stream bank and rapidly expanded the river channel width could be confirmed by analysis of the video images.

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Section: Outline Of the Ladof Modelmentioning

confidence: 99%

Section: Outline Of the Ladof Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia

Ishizuka

Kaji²,

Morita

et al. 2017

IJECE

Self Cite

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“…A twodimensional unsteady model was used to verify the river flow during the flood discharge and the process of inundation of protected lowlands caused by a typhoon in 2009 (Uno et al 2010). A new one-dimensional model for the river bed variations and flood runoff have been proposed for landslide dams (Satofuka et al 2007). This model is composed of a two-layer model for immature debris flow and a bank erosion model, applied to the landslide dam formed by the typhoon in 2005.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Inundation Areas Due to Failure in Small Earthfill Dam Using Numerical Analysis

Shoda

Kawamoto

Yoshisako

et al. 2015

JARQ

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This study aimed to verify the accuracy of inundation analysis by comparison with field-survey results for a small agricultural earthfill dam that failed due to heavy rain. In Japan, dam failures are caused by concentrated heavy rain or large earthquakes. Potential inundation areas are displayed on municipal "Hazard Maps" to reduce the risk of damage to downstream sites. However, the accuracy of inundation analysis for small earthfill dams has never been verified through comparison with field surveys. The following work was completed; i) the effect on the downstream gradient was verified by a simplified (one-dimensional unsteady flow) analysis for a case of dam failure; ii) the water depth and width of flow path in inundation areas were compared based on differences in peak outflow; and iii) the effect of the culvert structure blocked by flood debris downstream was also verified by comparing the result of analysis and the field survey. The following results were obtained: i) From the simplified analysis, the downstream water depth was sensitive to changes in outflow distribution from the dam breach section: ii) In the inundation analysis, using the peak outflow prediction equation proposed by Costa (1988), the water depth was deeper at the center of the flow path and the flow path was wider:iii) The water depth around the blocked culvert structure matched the field-survey results (the elevation data of the meshes around the culvert structure were raised to simulate the blocked structure).

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Numerical simulation method for predicting a flood hydrograph due to progressive failure of a landslide dam

et al. 2021

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Reducing the damage due to landslide dam failures requires the prediction of flood hydrographs. Although progressive failure is one of the main failure modes of landslide dams, no prediction method is available. This study develops a method for predicting progressive failure. The proposed method consists of the progressive failure model and overtopping erosion model. The progressive failure model can reproduce the collapse progression from a dam toe to predict the longitudinal dam shape and reservoir water level when the reservoir water overflows. The overtopping erosion model uses these predicted values as the new initial conditions and reproduces the dam erosion processes due to an overtopping flow in order to predict a flood hydrograph after the reservoir water overflows. The progressive failure model includes physical models representing the intermittent collapse of a dam slope, seepage flow in a dam, and surface flow on a dam slope. The intermittent collapse model characterizes the progressive failure model. It considers a stabilization effect whereby collapse deposits support a steep slope. This effect decreases as the collapse deposits are transported downstream. Such a consideration allows the model to express intermittent, not continuous, occurrences of collapses. Field experiments on the progressive failure of a landslide dam were conducted to validate the proposed method. The progressive failure model successfully reproduced the experimental results of the collapse progression from the dam toe. Using the value predicted by the progressive failure model, the overtopping erosion model successfully reproduced the flood hydrograph after the reservoir water started to overflow.

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Prediction of Floods Caused by Landslide Dam Collapse

Cited by 22 publications

References 6 publications

Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia

Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia

Prediction of Inundation Areas Due to Failure in Small Earthfill Dam Using Numerical Analysis

Numerical simulation method for predicting a flood hydrograph due to progressive failure of a landslide dam

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