Review
Engineering, Geological
G. Meyrat, B. McArdell, C. R. Mueller, J. Munch, P. Bartelt
Summary: We formulate and test different Voellmy-type mixture rheologies based on experimental data and mathematical constraints to accurately represent changing frictional resistance in debris flows. The experimental results indicate that flow friction decreases with increasing fluid concentration, but the reduction depends on both pore pressure and solid particle agitation. We carefully execute the changes in friction according to flow composition to avoid numerical instabilities, and use UAV-collected topographic data to test the different rheological formulations, successfully reproducing the correct erosion pattern and density profile.
Article
Environmental Sciences
Rajesh Kumar Dash, Debi Prasanna Kanungo, Jean Phillippe Malet
Summary: The study conducted debris flow runout modelling in the Indian Himalayas and assessed the hazards of Tangni debris flow. By calibrating the model and combining different release areas, potential debris flow scenarios in the future were predicted.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Review
Engineering, Geological
G. Meyrat, B. McArdell, K. Ivanova, C. Mueller, P. Bartelt
Summary: The proposed debris flow model divides the muddy fluid into two parts, one bonded to solid particles forming the first layer, and the other moving independently forming the second layer. Shearing of rocky particulate material during flow induces dilatant motions, changing the solid center-of-mass position. The model is able to capture the streamwise evolution of debris flow density in time and space.
Article
Engineering, Geological
Minu Treesa Abrahama, Neelima Satyama, Biswajeet Pradhan, Hongling Tian
Summary: This study presents a numerical model called DFS 2D for simulating debris flows. The applicability of the model is demonstrated through its reproduction of a specific debris flow event in China. The study also proposes two new calibration methods to address cumulative errors in numerical modeling of debris flows.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Gioele Ruffini, Riccardo Briganti, Paolo De Girolamo, Jacob Stolle, Bahman Ghiassi, Myrta Castellino
Summary: This study focuses on the numerical modeling of flow-debris interaction, using the DualSPHysics model to simulate and validate laboratory experiments. The model accurately reproduces the trajectory and velocity of the floating container, as confirmed by comparison with experimental measurements.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Muhammad Iylia Rosli, Faizah Che Ros, Khamarrul Azahari Razak, Sumiaty Ambran, Samira Albati Kamaruddin, Aznah Nor Anuar, Aminaton Marto, Tetsuo Tobita, Yusuke Ono
Summary: This study simulated debris flow in the Mesilau watershed of Kundasang Sabah, Malaysia, after the 2015 earthquake. The results showed an average velocity of 12.5 m/s, with a lead time of 4.5 minutes to Mesilau village over a distance of at least 18.6 km.
Article
Engineering, Geological
Wangcheng Zhang, Alexander M. Puzrin
Summary: This study establishes a time-efficient numerical model for simulating the entire evolution of submarine landslides, including pre-failure shear band propagation, slab failure, and post-failure dynamics, with detailed investigations on shear band propagation and slab failure.
Article
Geosciences, Multidisciplinary
Arunava Ray, Harshal Verma, Ashutosh Kumar Bharati, Rajesh Rai, Radhakanta Koner, Trilok Nath Singh
Summary: This study simulated and calibrated debris flow in a laboratory setting, validated with a case study of the Varunavat landslide, and evaluated the impact of various factors on debris flow. Qualitative and quantitative analysis of the debris flow was conducted, along with an examination of the role of retaining walls in mitigating debris flow.
Article
Engineering, Environmental
Rime Chehade, Bastien Chevalier, Fabian Dedecker, Pierre Breul, Jean-Claude Thouret
Summary: Lahars are natural phenomena that can cause severe damage in urban areas, and evaluating their impact on structures is crucial. A new numerical model has been developed to accurately assess the effects of debris flows on buildings and other infrastructure.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Herve Vicari, Quoc Anh Tran, Steinar Nordal, Vikas Thakur
Summary: This study investigates the entrainment of bed material and the impact on flexible barriers in debris flow channels through simulation experiments. By introducing the Mohr-Coulomb softening model, two main mechanisms leading to entrainment are identified, and a different type of bed erosion is observed compared to existing models.
Article
Geosciences, Multidisciplinary
Abu Reza Md Towfiqul Islam, Swapan Talukdar, Susanta Mahato, Sonali Kundu, Kutub Uddin Eibek, Quoc Bao Pham, Alban Kuriqi, Nguyen Thi Thuy Linh
Summary: This study applied and assessed two new hybrid ensemble models, Dagging and Random Subspace (RS) coupled with Artificial Neural Network (ANN), Random Forest (RF), and Support Vector Machine (SVM) for modeling flood susceptibility maps at the Teesta River basin in Bangladesh. The models performed well in predicting flood occurrences and could help in reducing flood-related threats and implementing effective mitigation strategies in the future. The Area Under the Curve (AUC) of ROC was above 0.80 for all models, with the Dagging model showing superior performance compared to RF, ANN, SVM, RS, and benchmark models.
GEOSCIENCE FRONTIERS
(2021)
Article
Geochemistry & Geophysics
S. Parez, M. Kozakovic, J. Havlica
Summary: The pore pressure drop caused by fault dilatancy during accelerating slip may suppress earthquake nucleation. We conducted a physics-based model simulation of slip in saturated granular layers coupled to a fluid pressure reservoir. The grain rearrangements during slip induce rapid dilatation, generating the maximum pore pressure drop. The pore pressure drop is consistent with a prediction for incompressible fluid flow until the critical slip rate is reached, then it decays slowly, inhibits dilatation rate, and increases the layer's strength, stabilizing the rupture growth. The magnitude of the pore pressure drop depends on the drainage number and beta sigma '(n).
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Multidisciplinary Sciences
Sen Wang, Hanwu Zheng, Er Huang, Xingnian Liu, Ming Luo
Summary: Flash floods in mountainous regions have caused significant damage globally in recent years, affecting and destroying structures. The impact load of flash floods is a crucial factor in the destruction process. This study compared and analyzed five existing models for calculating impact pressure based on experimental data. Moreover, a new model considering both hydrodynamic and hydrostatic pressure was proposed by combining two existing models. The results showed improved accuracy in the new model, with reduced relative errors for empirical coefficients. Additionally, the distribution of fluid impact and the maximum pressure point against a passable obstacle were discussed. The findings of this research could contribute to ideas for designing structures that can withstand flood impact.
Article
Engineering, Geological
Fan Yang, Xuanmei Fan, Zhenlei Wei, Srikrishnan Siva Subramanian, Theo W. J. Van Asch, Qiang Xu
Summary: Strong earthquakes can trigger extensive landslides, generating loose deposits that can become debris flows through subsequent rainfall. The parameters controlling post-earthquake debris flow activity and magnitude were poorly understood. This study analyzed debris flows in a representative catchment in the Wenchuan earthquake-hit region from 2008 to 2020, investigating changes in parameters such as material depletion, grain size, and vegetation recovery. The results provide important implications for risk assessment and prediction of future debris flows in earthquake-prone regions.
ENGINEERING GEOLOGY
(2023)
Review
Engineering, Geological
Guanlong Guo, Mamadou Fall
Summary: This paper reviews the state-of-the-art of coupled HM models for simulating gas migration behaviors in saturated bentonite, discussing their merits and limitations. Current models are generally established within Biot's consolidation theory or mixture theory framework, utilizing various mechanical models and numerical approaches to simulate gas flow and preferential pathway development.
ENGINEERING GEOLOGY
(2021)
