H. S. Kharismalatri, Y. Ishikawa, T. Gomi, K. Shiraki, T. Wakahara
{"title":"Collapsed material movement of deep-seated landslides caused by Typhoon Talas 2011 on the Kii Peninsula, Japan","authors":"H. S. Kharismalatri, Y. Ishikawa, T. Gomi, K. Shiraki, T. Wakahara","doi":"10.13101/IJECE.10.108","DOIUrl":"https://doi.org/10.13101/IJECE.10.108","url":null,"abstract":"","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126548922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Motoki Hiura, K. Nakatani, Y. Hasegawa, Y. Satofuka, T. Mizuyama
streams. Horiuchi et al.(2009 a), (2009 b) focused on the effect of the open-type steel sabo dam on sediment concentration, specifically In this study, we consider the debris flow trap function of the open-type steel sabo dam using channel experiments. Various studies have been conducted on the sediment trap function of open-type sabo dams due to boulder blocking in steep-slope areas, considered as areas with a slope of 15 ° or greater. However, many open-type sabo dams have been built in moderate-slope areas, which have a slope less than 15 ° . Few studies have been conducted on open-type sabo dams built in mild-slope areas. Therefore, we consider the trap function of the open-type sabo dams in areas having slopes of 12, 9, and 6 ° . In addition, we consider different shapes of the open-type steel sabo dam : grid-type, vertical-type, and horizontal-type. The results show that the trap functions were effective for all slope cases and for all types of dams. Steeper slopes resulted in higher trap functions. The grid-type and vertical-type dams trapped particles more effectively, with higher trap functions than the horizontal-type dams, and large differences appeared in cases where the slope was 6 ° .
流。Horiuchi et al.(2009 a)， (2009 b)研究了开敞式钢筑坝对泥沙浓度的影响，具体而言，本研究通过河道实验考虑开敞式钢筑坝的泥石流圈闭功能。在坡度大于等于15°的陡坡区，人们对开式沙坝因巨石淤积而产生的拦沙功能进行了各种各样的研究。然而，许多开敞式沙坝建在坡度小于15°的中等坡度地区。对在缓坡地区修建的敞开式沙坝的研究很少。因此，在坡度为12°、9°和6°的地区，我们考虑了开式沙坝的陷阱功能。此外，我们还考虑了开敞式钢坝的不同形状:网架型、垂直型和水平型。结果表明，疏水作用对所有坡型和所有坝型都是有效的。坡度越陡，圈闭函数越大。栅格坝和垂直坝截留颗粒效果较好，截留功能高于水平坝，且坡度为6°时差异较大。
{"title":"Sediment Trap Function of Open-type Steel Sabo Dam with respect to Shape and Installation Slope","authors":"Motoki Hiura, K. Nakatani, Y. Hasegawa, Y. Satofuka, T. Mizuyama","doi":"10.13101/IJECE.10.100","DOIUrl":"https://doi.org/10.13101/IJECE.10.100","url":null,"abstract":"streams. Horiuchi et al.(2009 a), (2009 b) focused on the effect of the open-type steel sabo dam on sediment concentration, specifically In this study, we consider the debris flow trap function of the open-type steel sabo dam using channel experiments. Various studies have been conducted on the sediment trap function of open-type sabo dams due to boulder blocking in steep-slope areas, considered as areas with a slope of 15 ° or greater. However, many open-type sabo dams have been built in moderate-slope areas, which have a slope less than 15 ° . Few studies have been conducted on open-type sabo dams built in mild-slope areas. Therefore, we consider the trap function of the open-type sabo dams in areas having slopes of 12, 9, and 6 ° . In addition, we consider different shapes of the open-type steel sabo dam : grid-type, vertical-type, and horizontal-type. The results show that the trap functions were effective for all slope cases and for all types of dams. Steeper slopes resulted in higher trap functions. The grid-type and vertical-type dams trapped particles more effectively, with higher trap functions than the horizontal-type dams, and large differences appeared in cases where the slope was 6 ° .","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115445361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, we study the impact of a transient free-surface flow of viscoplastic fluid on a rigid obstacle. This study is conducted numerically using the SPH (Smoothed Particle Hydrodynamics) method, and the Herschel-Bulkley rheological model. The SPH code and its specific adaptations to our needs are presented. The capacity of the code to meet the requirements of our objectives is validated on classic benchmarks. The virtual experiment setup is presented. The local characteristics of the flow near the obstacle, the length of the dead-zone of fluid at rest which forms upstream of the obstacle and the shape of the pressure signal applied to the obstacle are analyzed with reference to the inclination angle and Froude number of the incident flow. This analysis highlights the existence of two impact regimes referred to as the dead-zone and jet impact regimes respectively with a transition occurring for values of the Froude number about 1.3 to 1.5. These values are coherent with previous experimental studies.
{"title":"SPH-Based Numerical Study of the Impact of Mudflows on Obstacles","authors":"D. Laigle, M. Labbe","doi":"10.13101/IJECE.10.56","DOIUrl":"https://doi.org/10.13101/IJECE.10.56","url":null,"abstract":"In this work, we study the impact of a transient free-surface flow of viscoplastic fluid on a rigid obstacle. This study is conducted numerically using the SPH (Smoothed Particle Hydrodynamics) method, and the Herschel-Bulkley rheological model. The SPH code and its specific adaptations to our needs are presented. The capacity of the code to meet the requirements of our objectives is validated on classic benchmarks. The virtual experiment setup is presented. The local characteristics of the flow near the obstacle, the length of the dead-zone of fluid at rest which forms upstream of the obstacle and the shape of the pressure signal applied to the obstacle are analyzed with reference to the inclination angle and Froude number of the incident flow. This analysis highlights the existence of two impact regimes referred to as the dead-zone and jet impact regimes respectively with a transition occurring for values of the Froude number about 1.3 to 1.5. These values are coherent with previous experimental studies.","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129951300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Ishizuka, A. Kaji, Koji Morita, Toshio Mori, M. Chiba, Yoshiaki Kashiwabara, Kosuke Yoshino, T. Uchida, T. Mizuyama
1 Erosion and Sediment Control Research Group, Public Works Research Institute (Now in Rokko Sabo Office, Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism (MLIT)) (3-13-15, Sumiyoshihigashimachi, Higashinada-ku, Kobe, Hyogo 6580052, Japan) E-mail: ishiduka-t86ie@kkr.mlit.go.jp 2 TOKEN C.E.E. Consultants Co., Ltd. (1-8-63 Tenmabashi, Kita-ku, Osaka 5300042, Japan) 3 Ministry of Land, Infrastructure, Transport and Tourism (2-1-3 Kasumigaseki, Chiyoda-ku, Tokyo 1008918, Japan) 4 Sabo Frontier Foundation (2-7-4 Hirakawacho, Chiyoda-ku, Tokyo 1020093, Japan) 5 Asia Air Survey Co., Ltd. (1-2-2 Manpukuji, Aso-ku, Kawasaki, Kanagawa 2150004, Japan) 6 Erosion and Sediment Control Division, National Institute for Land and Infrastructure Management (1 Asahi, Tsukuba, Ibaraki 3050804, Japan) 7 Graduate School of Agricultural Science, Kyoto University (Now in National Graduate Institute for Policy Studies) (7-22-1, Roppongi, Minato-ku, Tokyo, 1068677, Japan)
{"title":"Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia","authors":"T. Ishizuka, A. Kaji, Koji Morita, Toshio Mori, M. Chiba, Yoshiaki Kashiwabara, Kosuke Yoshino, T. Uchida, T. Mizuyama","doi":"10.13101/IJECE.10.32","DOIUrl":"https://doi.org/10.13101/IJECE.10.32","url":null,"abstract":"1 Erosion and Sediment Control Research Group, Public Works Research Institute (Now in Rokko Sabo Office, Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism (MLIT)) (3-13-15, Sumiyoshihigashimachi, Higashinada-ku, Kobe, Hyogo 6580052, Japan) E-mail: ishiduka-t86ie@kkr.mlit.go.jp 2 TOKEN C.E.E. Consultants Co., Ltd. (1-8-63 Tenmabashi, Kita-ku, Osaka 5300042, Japan) 3 Ministry of Land, Infrastructure, Transport and Tourism (2-1-3 Kasumigaseki, Chiyoda-ku, Tokyo 1008918, Japan) 4 Sabo Frontier Foundation (2-7-4 Hirakawacho, Chiyoda-ku, Tokyo 1020093, Japan) 5 Asia Air Survey Co., Ltd. (1-2-2 Manpukuji, Aso-ku, Kawasaki, Kanagawa 2150004, Japan) 6 Erosion and Sediment Control Division, National Institute for Land and Infrastructure Management (1 Asahi, Tsukuba, Ibaraki 3050804, Japan) 7 Graduate School of Agricultural Science, Kyoto University (Now in National Graduate Institute for Policy Studies) (7-22-1, Roppongi, Minato-ku, Tokyo, 1068677, Japan)","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Torrential barriers with energy-dissipating, filtering or deflecting function for debris flow are subject to extreme dynamic stress that presupposes the application of high safety standards for design, construction and maintenance. The newly issued Austrian Standard ONR 24801 provides a standardized model for the design of torrential barriers under debris flow impact, which has been developed from comparative calculation of common debris flow models from engineering practice in torrent control and calibrated by impact measurements of debris flow events. The model is based on a combined static-dynamic stress approach and also takes into account the impulse by a single object (block, tree trunk). The ONR 24801 is the last part of a newly issued series of Austrian Standards concerning technical torrent, avalanche and rock-fall protection works. Since 2008 the following standards concerning torrent control works were published: Protection works for torrent control Terms and their definitions as well as classification, ONR 24800:2009 02 15 Protection works for torrent control Static and dynamic actions on structures, ONR 24801:2013 08 15 Protection works for torrent control Design of structures, ONR 24802:2011 01 01 Protection works for torrent control Operation, monitoring, maintenance, ONR 24803:2008 02 01
{"title":"Standardized Stress Model for Design of Torrential Barriers under Impact by Debris Flow (According to Austrian Standard Regulation 24801)","authors":"J. Huebl, G. Nagl, J. Suda, F. Rudolf-Miklau","doi":"10.13101/IJECE.10.47","DOIUrl":"https://doi.org/10.13101/IJECE.10.47","url":null,"abstract":"Torrential barriers with energy-dissipating, filtering or deflecting function for debris flow are subject to extreme dynamic stress that presupposes the application of high safety standards for design, construction and maintenance. The newly issued Austrian Standard ONR 24801 provides a standardized model for the design of torrential barriers under debris flow impact, which has been developed from comparative calculation of common debris flow models from engineering practice in torrent control and calibrated by impact measurements of debris flow events. The model is based on a combined static-dynamic stress approach and also takes into account the impulse by a single object (block, tree trunk). The ONR 24801 is the last part of a newly issued series of Austrian Standards concerning technical torrent, avalanche and rock-fall protection works. Since 2008 the following standards concerning torrent control works were published: Protection works for torrent control Terms and their definitions as well as classification, ONR 24800:2009 02 15 Protection works for torrent control Static and dynamic actions on structures, ONR 24801:2013 08 15 Protection works for torrent control Design of structures, ONR 24802:2011 01 01 Protection works for torrent control Operation, monitoring, maintenance, ONR 24803:2008 02 01","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126833156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Intermittent surges of debris flows are frequently observed in mountain regions. This type of flow is considered to be characterized by developing roll waves (surges) due to flow instabilities and by weak sediment concentrations. For an understanding of fluctuation of the flow depth, wave equations are needed. It was presented a wave equation of roll waves based on shallow water momentum equation, and analytical solution on an initial and boundary condition and some numerical solutions were shown in this paper. These results show an improved understanding of the phenomena of intermittent debris flow.
{"title":"Wave Equation and Some Solutions on Intermittent Debris flow","authors":"M. Arai","doi":"10.13101/IJECE.10.39","DOIUrl":"https://doi.org/10.13101/IJECE.10.39","url":null,"abstract":"Intermittent surges of debris flows are frequently observed in mountain regions. This type of flow is considered to be characterized by developing roll waves (surges) due to flow instabilities and by weak sediment concentrations. For an understanding of fluctuation of the flow depth, wave equations are needed. It was presented a wave equation of roll waves based on shallow water momentum equation, and analytical solution on an initial and boundary condition and some numerical solutions were shown in this paper. These results show an improved understanding of the phenomena of intermittent debris flow.","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116197039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Since 2004, debris-flow evacuation implemented based on critical rainfall intensity for warnings of debris-flow occurrences has been a regulation in Taiwan, and its many implementations in recent years have proven successful. When deciding on the rainfall intensity associated with evacuation decisions, the social cost of debris-flow disasters should be taken into account in addition to the vulnerability of the area to such disasters. However, in current practical debris-flow evacuation processes, that cost is not considered. As such, the aim of this paper is to explore how rainfall intensity and social cost relate to the decision to evacuate ahead of a debris-flow. In doing so, decision-making and cost analysis methods commonly used in management science were employed to model a rationally simplified hypothesis and develop a systematic decision-making process regarding debris-flow evacuation. This process is influenced by uncertain parameters, such as typhoon-rainfall levels and debris-flow occurrences, and determined through statistical analysis; further, the value parameters of costs in terms of deaths and evacuation payments are also considered. Finally, the model thus developed was applied to a severe debris flow disaster simulation that occurred in Taiwan in 1990 for empirical testing. Results of this study suggest that the rainfall intensity and social costs are highly pertinent to decisions regarding debris-flow evacuation when considered from a financial perspective. Moreover, by quantifying the social costs of debris-flow evacuation through decision analysis, this study may help explain the relationship between the vulnerability of an area to disasters, the social costs involved, and the decision-making criteria. It may also provide scholars a better understanding of optimal strategies for the advancement of debris-flow disaster prevention.
{"title":"Applied Managerial Decision Analysis for Debris Flow Evacuation Decisions","authors":"Wei-Lin Lee, Yu-Shiu Chen, C. Shieh","doi":"10.13101/IJECE.10.24","DOIUrl":"https://doi.org/10.13101/IJECE.10.24","url":null,"abstract":"Since 2004, debris-flow evacuation implemented based on critical rainfall intensity for warnings of debris-flow occurrences has been a regulation in Taiwan, and its many implementations in recent years have proven successful. When deciding on the rainfall intensity associated with evacuation decisions, the social cost of debris-flow disasters should be taken into account in addition to the vulnerability of the area to such disasters. However, in current practical debris-flow evacuation processes, that cost is not considered. As such, the aim of this paper is to explore how rainfall intensity and social cost relate to the decision to evacuate ahead of a debris-flow. In doing so, decision-making and cost analysis methods commonly used in management science were employed to model a rationally simplified hypothesis and develop a systematic decision-making process regarding debris-flow evacuation. This process is influenced by uncertain parameters, such as typhoon-rainfall levels and debris-flow occurrences, and determined through statistical analysis; further, the value parameters of costs in terms of deaths and evacuation payments are also considered. Finally, the model thus developed was applied to a severe debris flow disaster simulation that occurred in Taiwan in 1990 for empirical testing. Results of this study suggest that the rainfall intensity and social costs are highly pertinent to decisions regarding debris-flow evacuation when considered from a financial perspective. Moreover, by quantifying the social costs of debris-flow evacuation through decision analysis, this study may help explain the relationship between the vulnerability of an area to disasters, the social costs involved, and the decision-making criteria. It may also provide scholars a better understanding of optimal strategies for the advancement of debris-flow disaster prevention.","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133780430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Typhoon No. 26 in 2013 attacked the Izu-Oshima Island with record heavy rainfall and caused a disaster resulting from landslides and mud flows. This extreme event is the motivation of our study on how we evaluate hazardous zones at risk of mud flows and how we design structural and non-structural measures accordingly. The present study describes sediment runout processes, mud flow control by means of a guide wall, and a method to evaluate topological conditions in which landslides and mud flows avalanche into unexpected areas. The landslides took place in the western slope of Izu-Oshima, which is only about 2500m wide. Analyses on phase shifting from solid to liquid as well as on mobility of the soil masses suggest that the soil masses released by the landslides transformed directly into mud flows, and that the mud flows developed in size through sediment erosion in their run-out processes. The predicted results by means of a numerical model based on depth-integrated governing equations of sediment-water mixture flow suggest that mud flows could be controlled well using a guide wall, which shows a high possibility of mud flow control using a storage structure with a guide wall. In addition, we propose a simple method to evaluate topological conditions to judge whether mud flows will enter unexpected areas, which will provide a key to identify hazardous zones including even those that have been missed out conventionally.
{"title":"Sediment Run-Out Processes and Possibility of Sediment Control Structures in the 2013 Izu-Ohshima Event","authors":"S. Egashira, H. Takebayashi, M. Sekine, N. Osanai","doi":"10.13101/IJECE.9.155","DOIUrl":"https://doi.org/10.13101/IJECE.9.155","url":null,"abstract":"Typhoon No. 26 in 2013 attacked the Izu-Oshima Island with record heavy rainfall and caused a disaster resulting from landslides and mud flows. This extreme event is the motivation of our study on how we evaluate hazardous zones at risk of mud flows and how we design structural and non-structural measures accordingly. The present study describes sediment runout processes, mud flow control by means of a guide wall, and a method to evaluate topological conditions in which landslides and mud flows avalanche into unexpected areas. The landslides took place in the western slope of Izu-Oshima, which is only about 2500m wide. Analyses on phase shifting from solid to liquid as well as on mobility of the soil masses suggest that the soil masses released by the landslides transformed directly into mud flows, and that the mud flows developed in size through sediment erosion in their run-out processes. The predicted results by means of a numerical model based on depth-integrated governing equations of sediment-water mixture flow suggest that mud flows could be controlled well using a guide wall, which shows a high possibility of mud flow control using a storage structure with a guide wall. In addition, we propose a simple method to evaluate topological conditions to judge whether mud flows will enter unexpected areas, which will provide a key to identify hazardous zones including even those that have been missed out conventionally.","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134434308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Nakatani, Megumi Kosugi, Y. Satofuka, T. Mizuyama
. Takahashi, T. (2007): Debris flow: Mechanics, prediction and countermeasures, Taylor & Francis, Leiden, CRC Press,
． 高桥，T.(2007):泥石流:力学、预测与对策，泰勒和弗朗西斯，莱顿，CRC出版社，
{"title":"Debris Flow Flooding and Debris Deposition Considering the Effect of Houses: Disaster Verification and Numerical Simulation","authors":"K. Nakatani, Megumi Kosugi, Y. Satofuka, T. Mizuyama","doi":"10.13101/IJECE.9.145","DOIUrl":"https://doi.org/10.13101/IJECE.9.145","url":null,"abstract":". Takahashi, T. (2007): Debris flow: Mechanics, prediction and countermeasures, Taylor & Francis, Leiden, CRC Press,","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123820591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose a numerical simulation method for calculating the vertical distributions of the flow velocity and the sediment concentration in debris flows. Our method is based on the moving particle semi-implicit (MPS) method. We introduce the constitutive equations of Egashira et al. to the MPS method. Numerical simulations of the debris flow are performed by using an existing model based on a shallow water equation, along with our model based on the MPS method. In the condition where the riverbed gradient becomes less steep, there is good agreement with experimental results, including those involving the formation of a convex upward deposition shape in the initial deposition process. Results for the initial deposition process are not produced with existing simulation method based on a shallow water equation. Further, our model can yield clear results when the upper and lower layers have different flow directions in a numerical simulation of the collapse of a natural dam by overtopping.
{"title":"Development of Modified Particles Method for Simulation of Debris Flow Using Constitutive Equations","authors":"Takuro Suzuki, N. Hotta","doi":"10.13101/IJECE.9.165","DOIUrl":"https://doi.org/10.13101/IJECE.9.165","url":null,"abstract":"We propose a numerical simulation method for calculating the vertical distributions of the flow velocity and the sediment concentration in debris flows. Our method is based on the moving particle semi-implicit (MPS) method. We introduce the constitutive equations of Egashira et al. to the MPS method. Numerical simulations of the debris flow are performed by using an existing model based on a shallow water equation, along with our model based on the MPS method. In the condition where the riverbed gradient becomes less steep, there is good agreement with experimental results, including those involving the formation of a convex upward deposition shape in the initial deposition process. Results for the initial deposition process are not produced with existing simulation method based on a shallow water equation. Further, our model can yield clear results when the upper and lower layers have different flow directions in a numerical simulation of the collapse of a natural dam by overtopping.","PeriodicalId":378771,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114302730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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