Article
Geochemistry & Geophysics
Zhen Cui, Maochu Zhang, Qian Sheng
Summary: This paper introduces a new method to analyze the static and dynamic stability of complex rock slopes by combining the rigid discrete element method (DEM), shear strength reduction (SSR) method, and Newmark method. The new method allows for direct calculation of the safety factor and sliding forces of wedges without auxiliary assumptions, and is suitable for complex wedge structures in practical design. This approach has been validated in static and dynamic examples, with parameter analysis indicating potential underestimation of seismic displacement when evaluating solely based on pseudo-static safety factor. An example case demonstrates the use of the proposed method for seismic stability assessment and slope reinforcement scheme, highlighting cost-saving benefits compared to traditional methods.
Article
Energy & Fuels
Furkhat Khamitov, Nguyen Hop Minh, Yong Zhao
Summary: A coupled microscopic simulation method was used to investigate the bond breakage behavior during perforation in weak cemented sandstone, revealing the formation of a damage zone and rapid expansion of a compacted core of unbonded particles.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Civil
Pankaj R. Dhote, Yogesh Joshi, Adnan Rajib, Praveen K. Thakur, Bhaskar R. Nikam, S. P. Aggarwal
Summary: Despite the efficiency issues of complex hydrodynamic models, topography-based approaches relying on Digital Elevation Models (DEMs) are increasingly being used as alternatives for floodplain mapping in data-scarce mountainous terrains. In this study, we compared three topography-based approaches along a 56-km river reach in the North West Himalayas to a reference inundation extent simulated by a hydrodynamic model. Our findings suggest that HAND and TWI produce more accurate floodplain maps compared to SP, with HAND demonstrating higher agreement with the model-simulated reference map. The study provides valuable insights for floodplain studies in developing countries with data scarcity.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Lin Ouyang, Hui Lu, Kun Yang, L. Ruby Leung, Yan Wang, Long Zhao, Xu Zhou, Lazhu, Yingying Chen, Yaozhi Jiang, Xiangnan Yao
Summary: This study examines a method combining limited gauge data and high-resolution numerical simulation to quantify precipitation uncertainties in the central Himalayas. The evaluation over a densely-gauged area shows comparable values between station observations and simulations for the Coefficient of spatial Variability (CV) and the minimum Number of Required Stations (NRS).
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yunfeng Zou, Peng Yue, Qingkuan Liu, Xuhui He, Zhen Wang
Summary: With the increasing energy consumption, the rational and efficient utilization of wind energy has attracted global attention. This study investigates the wind characteristics on an island in Southeast China using numerical simulation and wind tunnel test. The results reveal that wind speed is influenced by the incoming wind direction and local terrain, and different terrains impact wind speed and turbulence intensity differently.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Aerospace
Xinying Liu, Anna Aba, Pierluigi Capone, Leonardo Manfriani, Yongling Fu
Summary: The concept of a new energy management system that combines meteorological and orographic influences on airplane safety envelope has been developed and implemented at the ZHAW Centre for Aviation. A flight simulation environment was built to test the cockpit display system, and pilot-in-the-loop flight simulations were conducted. The study focused on a small mountainous region in Switzerland and used a large-eddy simulation model to generate highly resolved wind fields.
Article
Engineering, Environmental
Jaspreet Singh, Sarada Prasad Pradhan, Mahendra Singh, Lal Hruaikima
Summary: The existing structural discontinuities, such as faults, joints, and cleavages in rock slopes, play a crucial role in controlling the properties of the rock mass, and their presence is influenced by regional tectonic structures. The concept of damage, applied to intact rock and rock mass, refers to the degradation of their strength properties. A study conducted in the Garhwal Himalaya region revealed that damage caused by regional syncline resulted in high variability in fracture intensity and trace length away from the hinge zone.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Fhatuwani Sengani, Dhiren Allopi
Summary: This study presents a numerical simulation of the failure evolution of a slope with a fault and a road cut using a finite element method with an elastoplastic model. The simulation successfully reproduces the failure evolution process and the final run-out distance of the slope material. The study also reveals that the composition and phases of the material significantly influence the distance the material can reach during flow evolution.
SCIENTIFIC REPORTS
(2022)
Article
Meteorology & Atmospheric Sciences
Fang-Yi Cheng, Yu-Tzu Wang, Mu-Qun Huang, Pay-Liam Lin, Ching-Ho Lin, Po-Hsiung Lin, Sheng-Hsiang Wang, Ben-Jei Tsuang
Summary: This article investigates the atmospheric boundary layer and flow circulation over complex terrain. Observations and numerical simulations show that the boundary layer is well-mixed during the daytime with enhanced flow in the afternoon, and a stable boundary layer and low-level jet form at night.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Energy & Fuels
A. Barbon, P. Fortuny Ayuso, L. Bayon, C. A. Silva
Summary: This paper explores an advantage of using mountainous terrain for solar plant installation: higher annual solar irradiation incident of single-axis N-S trackers installed on sloping terrain compared to horizontal ones. Theoretical study, numerical simulations, and experimental results confirm this advantage. Theoretical values for energy gain at different slopes between latitudes of 6 degrees and 60 degrees in the northern hemisphere are provided, with gains reaching up to 13.5%.
Article
Remote Sensing
De Petris Samuele, Sarvia Filippo, Tommaso Orusa, Borgogno-Mondino Enrico
Summary: The operational services based on SAR data hold potential, but are hindered by the complexity of data pre-processing. A trigonometry-based mapping method in GEE was implemented in this study to generate distortion maps and evaluate the reliability of SAR data for information deduction. The results show that this methodology can effectively mask unreliable observations and inform users about the areas suitable for SAR data monitoring.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2021)
Article
Multidisciplinary Sciences
Yi Peng, Sheng Zhang, Jiangfeng Wan, Yangyang Yang, Kewei Tao, LiDong Ma, Guanghui Yang, Lei Yang, Mengke Wang
Summary: In order to solve the problem of particle clogging in slit funnels and maintain a stable discharge flow rate, a new funnel structure called the slit baffle funnel was proposed. Using the discrete element method (DEM), an investigation was conducted to study the impact of funnel half-angle theta, outlet width W, and baffle height H on flow rate and flow pattern. The results showed that this new funnel structure effectively prevented particle clogging and ensured a continuous and stable flow rate, even with a small outlet width. It was found that a higher flow rate could be achieved with a smaller funnel half-angle when H >3d. This new funnel structure has practical applications in industries such as mining, agriculture, food, and pharmaceuticals where granular matter clogging can occur in slit geometries.
Article
Chemistry, Multidisciplinary
Raimondas Jasevicius
Summary: The study investigates the interaction of erythrocytes with activated platelets and fibrin during thrombus formation, achieving different behaviors by considering the influence of the fluid and modeling a soft biological cell using the discrete element method.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
C. Gokceoglu, B. Unutmaz
Summary: Waste dams are commonly used for storing mining byproducts and their construction is of high importance due to potential harm to the environment and nearby individuals. This study utilizes 3D finite-element analysis to investigate a nickel-ore waste dam in Turkey and examines the effects of slope instability on the main dam body. The results suggest that after slope rehabilitation, deformations significantly decreased and the waste dam became safer.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Wei Gao, Xin Chen, Xu Wang, Chengjie Hu
Summary: The paper introduces a new strength reduction numerical method for analyzing the stability of fractured rock slopes, defining the critical state of the slope based on the analysis of the development of the crack tip plastic zone for preexisting cracks. The results show that the safety factor corresponding to the new method is smaller than that derived by the traditional method, benefiting engineering safety.
ENGINEERING WITH COMPUTERS
(2021)