caa a22 4500 60545440X CHVBK 20210128100207.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10064-014-0705-6 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0705-6 SPH-based numerical simulation of catastrophic debris flows after the 2008 Wenchuan earthquake [Elektronische Daten] [Yu Huang, Hualin Cheng, Zili Dai, Qiang Xu, Fang Liu, Kazuhide Sawada, Shuji Moriguchi, Atsushi Yashima] Post-earthquake debris flows that have occurred in Sichuan Province in southwestern China following the Wenchuan earthquake on May 12, 2008, have caused significant damage and casualties. Previous earthquake-induced landslides produced large amounts of loose material that remained on the steep slopes and in the gullies. As a consequence of heavy rainstorms during the rainy seasons, the existing loose material was transformed into numerous debris flows. Research has shown that the debris flows in the Wenchuan earthquake disaster areas have been characterized by their large scale, high speed, long run-out, and destructive impact. In order to identify the areas potentially at risk and to predict the flow severity, an accurate numerical method is needed to simulate these debris flows. In this paper, we have proposed a smoothed particle hydrodynamics (SPH) modeling technique—a meshfree particle method—to simulate the post-earthquake debris flows in the Wenchuan earthquake disaster areas. The SPH modeling technique introduces a Bingham model to analyze the relationship between material stress rates and particle motion velocity. Compared to traditional numerical methods, the SPH modeling technique is a true meshfree method of a pure Lagrangian nature. It can instantaneously track the motion of each particle, accurately predict the velocity, and naturally handle problems with extremely large deformations. In addition, the SPH method is based on continuum mechanics, and is therefore an efficient method to simulate large-scale debris flows. In this work, first, a viscoplastic fluid was simulated and verified with experimental results in order to evaluate the accuracy of the SPH model. Then propagation analysis of two typical post-earthquake debris flows in earthquake-hit areas was carried out, applying the SPH model. The simulation results showed good agreement with the limited field observation data. Our proposed SPH numerical modeling is able to capture the fundamental dynamic behavior of post-earthquake debris flows and can partially explain these complex phenomena. These simulation results can provide a preliminary scientific basis for hazard assessment and site selection for reconstruction in earthquake-prone areas. Springer-Verlag Berlin Heidelberg, 2014 Wenchuan earthquake nationallicence Post-earthquake debris flow nationallicence Smoothed particle hydrodynamics nationallicence Long run-out nationallicence Hazard assessment nationallicence Huang Yu Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut Cheng Hualin Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut Dai Zili Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut Xu Qiang State Key Laboratory of Geohazard Prevention and Geo-environment Protection, Chengdu University of Technology, 610059, Chengdu, China aut Liu Fang Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut Sawada Kazuhide Department of Civil Engineering, Gifu University, 501-1193, Gifu, Japan aut Moriguchi Shuji International Research Institute of Disaster Science, Tohoku University, 980-8579, Sendai, Japan aut Yashima Atsushi Department of Civil Engineering, Gifu University, 501-1193, Gifu, Japan aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1137-1151 1435-9529 74:4<1137 2015 74 10064 https://doi.org/10.1007/s10064-014-0705-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0705-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huang Yu Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut NATIONALLICENCE 700 1- Cheng Hualin Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut NATIONALLICENCE 700 1- Dai Zili Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut NATIONALLICENCE 700 1- Xu Qiang State Key Laboratory of Geohazard Prevention and Geo-environment Protection, Chengdu University of Technology, 610059, Chengdu, China aut NATIONALLICENCE 700 1- Liu Fang Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092, Shanghai, China aut NATIONALLICENCE 700 1- Sawada Kazuhide Department of Civil Engineering, Gifu University, 501-1193, Gifu, Japan aut NATIONALLICENCE 700 1- Moriguchi Shuji International Research Institute of Disaster Science, Tohoku University, 980-8579, Sendai, Japan aut NATIONALLICENCE 700 1- Yashima Atsushi Department of Civil Engineering, Gifu University, 501-1193, Gifu, Japan aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1137-1151 1435-9529 74:4<1137 2015 74 10064