Results 61 to 70 of about 2,930,695 (264)

Morphometric analysis and watershed delineation of the Karnaphuli river basin: A comparative study using different DEMs in Chittagong, Bangladesh

River, Volume 3, Issue 4, Page 426-437, November 2024.
Abstract The present study aimed to delineate a robust watershed boundary and extract its morphometric parameters in the Karnaphuli watershed, Bangladesh, using different digital elevation models (DEMs). Two DEMs, the shuttle radar topographic mission (SRTM) and the terra advanced spaceborne thermal emission and reflection radiometer (ASTER), were ...
Sujit Kumar Roy, Md. Arif Chowdhury
wiley   +1 more source

3‐D impulse‐based level‐set method for granular flow modeling

International Journal for Numerical Methods in Engineering, Volume 125, Issue 17, 15 September 2024.
Abstract We explore the viability of modeling dynamic problems with a new formulation of an impulse‐based Level‐Set DEM (LS‐DEM). The new formulation is stable, fast, and energy conservative. However, it can be numerically stiff when the assembly has substantial mass differences between particles.
Peng Tan, Hasitha S. Wijesuriya, Nicholas Sitar   +2 more
wiley   +1 more source

Individual Tree Position Extraction and Structural Parameter Retrieval Based on Airborne LiDAR Data: Performance Evaluation and Comparison of Four Algorithms

Remote Sensing, 2020
Information for individual trees (e.g., position, treetop, height, crown width, and crown edge) is beneficial for forest monitoring and management.
Wei Chen, Haibing Xiang, Kazuyuki Moriya
doaj   +1 more source

Spatial distribution of urban basic education resources in Shanghai: Accessibility and supply-demand matching evaluation

Open Geosciences, 2023
This article focuses on Shanghai as a case study and utilizes various factors such as points of interest, nighttime lights, land use, road networks, and Digital Elevation Model to examine the spatial distribution of population.
Yuan Hongfu, Yang Xiangguo
doaj   +1 more source

A discretization‐convergent level‐set‐discrete‐element‐method using a continuum‐based contact formulation

International Journal for Numerical Methods in Engineering, Volume 125, Issue 5, 15 March 2024.
Abstract The level‐set‐discrete‐element‐method (LS‐DEM) was developed to overcome the shape limitation of traditional discrete element method. LS‐DEM's shape generality relies on a node‐based surface discretization of grain boundary, and it has been used to shed new light of a variety of granular mechanics applications with realistically shaped grains ...
Shai Feldfogel, Konstantinos Karapiperis, Jose Andrade, David S. Kammer   +3 more
wiley   +1 more source

The performance of landslide susceptibility models critically depends on the quality of digital elevation models

Geomatics, Natural Hazards & Risk, 2020
Considering the critical importance of the quality of input data for landslide susceptibility, we investigate the performance improvements that can be achieved by different globally available digital elevation models (DEMs) using different state-of-the ...
Jonas Brock, Patrick Schratz, Helene Petschko, Jannes Muenchow, Mihai Micu, Alexander Brenning   +5 more
doaj   +1 more source

On the friction dependency of the stress Lode angle

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 48, Issue 4, Page 1001-1017, March 2024.
Abstract The shape of the failure locus of a material is significant for its strength predictions. Even when constitutive models include the same critical stress surface, different critical stress ratios can be predicted for an identical applied isochoric strain path. In this article, we investigate critical stress predictions of different constitutive
Gertraud Medicus, Mehdi Pouragha, Alexander Ostermann, Wolfgang Fellin   +3 more
wiley   +1 more source

Shear test as calibration experiment for DEM simulations: Spheropolygonal particle model [PDF]

FME Transactions
The rapid development of computer technology provides an opportunity for researchers dealing with discrete element modeling to develop more accurate particle models.
Huang Junhao, Safranyik Ferenc, Tóth János, Keppler István   +3 more
doaj   +1 more source

Virtual globes for UAV-based data integration: Sputnik GIS and Google Earth™ applications

International Journal of Digital Earth, 2019
The integration of local measurements and monitoring via global-scale Earth observations has become a new challenge in digital Earth science. The increasing accessibility and ease of use of virtual globes (VGs) represent primary advantages of this ...
Marcos Arza-García, Mariluz Gil-Docampo, Juan Ortiz-Sanz, Santiago Martínez-Rodríguez   +3 more
doaj   +1 more source

Clay micromechanics: Mapping the future of particle-scale modelling of clay [PDF]

E3S Web of Conferences
Geotechnical engineers need to predict the macroscopic behaviour of clays in terms of strength, stiffness, and permeability and the variation in these properties during deformation. Engineers also need to predict the influence of environmental variables (
Pagano Arianna Gea, Alonso-Marroquin Fernando, Ioannidou Katerina, Radjai Farhang, O’Sullivan Catherine   +4 more
doaj   +1 more source