Using a theoretical analysis of the ion beam sputtering dynamics, we demonstrate how ion bombardment on an initially sloped surface can create knife-edge-like ridges on the surface. These ridges arise as nonclassical shocklike solutions that are undercompressive on both sides and appear to control the dynamics over a large range of initial conditions. The slope of the ridges is selected uniquel...

Automated procedures for photogrammetric image processing and Digital Elevation Models (DEM) extraction yield high precision terrain models in a short time, reducing manual editing; their accuracy is strictly related to image quality and terrain features. After an analysis of the performance of the Digital Photogrammetric Workstation (DPW) 770 Helava, the paper compares DEMs derived from differ...

The growth of population in a worldwide scale and the social vulnerability of different human communities subjected to war, economy collapse, ethnical persecution and poverty impose a strong pressure to occupy multi-hazard environments, like flood plains and hill slopes subject to landslides (Sullivan-Wiley and Gianotti 2017). As human communities occupy unstable hill slope areas, activities li...

Rock slopes have the characteristics of complex geological conditions, weak structural surface development, steep slope, and great damage. In this study, Sujiaba overpass slope in Chongqing was selected as evaluation object, main stability methods rock were analyzed. Combined with special conditions geographical location through a survey, qualitatively analyzed based on stereographic projection...

this paper discusses some of the fundamental considerations when managing mining slopes. the goal of management is to reduce all components that contribute to the geotechnical risk and by doing so reduce the risk to as low as reasonably achievable. the techniques and procedures suggested are not exhaustive; they represent a snapshot of some of the practical techniques the author has found usefu...

The influence of different wind directions on the outbreak of convection in Northern England, was investigated with a high-resolution numerical model. The Clark model, a 3D finite-difference, non-hydrostatic model was used in this study. It was initialised with the topography of Northern England, a representation of surface characteristics, and used a routinely available meteorological sounding...

Interferometric synthetic aperture radar (InSAR) is a powerful geodetic tool used to construct digital elevation models of the earth’s topography and to image centimeter-scale displacements associated with crustal deformation and the flow of ice sheets. The past decade has seen significant improvements in our understanding of earthquakes, volcanoes, and glaciers as a direct result of this techn...

We present a method for computing the solution to the infinite horizon continuous-time constrained linear quadratic regulator (CLQR). The method relies on two main features: a multi-grid method for placing a finite number of time intervals, and a piece-wise linear parameterization of the input within the intervals. The input values at the grid points and slopes within the time intervals are com...

Ice-shelf buttressing and the stability of marinetype ice sheets are investigated numerically. Buttressing effects are analysed for a situation where a stable grounding line is located on a bed sloping upwards in the direction of flow. Such grounding-line positions are known to be unconditionally unstable in the absence of transverse flow variations. It is shown that ice-shelf buttressing can r...

Out-of-plane curvature of real submarine slopes imposes limitations on applicability existing planar criteria for catastrophic growth slip surfaces. In this paper, the an initially weakened zone in three-dimensional (3D) convex and concave is investigated using process approach. The geometry problem presented a curvilinear coordinate system which governing equations surface are derived. Solutio...