Modeling SAR Observables by Combining a Crop-Growth Model With Machine Learning

In this article, our aim is to estimate synthetic aperture radar (SAR) observables, such as backscatter in VV and VH polarizations, as well as the VH/VV ratio, cross ratio, and interferometric coherence in VV, from agricultural fields. In this study, we use the decision support system for agrotechnology transfer (DSSAT) crop-growth simulation...

The impact of clastic syn-sedimentary compaction on fluvial-dominated delta morphodynamics

In natural deltaic settings, mixed hydrodynamic forcings and sediment properties are known to influence the preserved delta deposits. One process that has not received much attention yet is syn-sedimentary compaction of clastic sediment on millennial-scale delta evolution. To study how compaction interacts with delta morphodynamics and...

Crop-Growth Driven Forward-Modeling of Sentinel-1 Observables Using Machine-Learning

This paper presents an approach to implement a forward model for Sentinel-1 copol and crosspol backscatter and coherence using crop bio-geophysical parameters namely leaf area index, biomass, canopy height, soil moisture and root zone moisture as inputs for the maize. These required input parameters are generated using Decision Support System...

Finite Element Methods for Seismic Imaging: Cost Reduction through mass matrix preconditioning by defect correction

Demand for hydrocarbon fuel is predicted to keep increasing in the coming decades in spite of easily accessible alternative fuels due to shifting geopolitical and economic situations. In order to find new hydrocarbon pockets, we need sharper images of earth’s subsurface. Also, the exploration of other sources of energy like geothermal will...

FMPoNe - Forward Model radiative transfer for Polarization Nephelometer: In low flux density planetary atmosphere

In the search for understanding the formation and evolution of a solar system, terrestrial planets & any exoplanetary systems, the understanding of the evolution & formation of giant planet's play a crucial role. The primary goal is to study the atmospheres, their physical & chemical processes governed by gases, clouds, and hazes....

Modeling breast ultrasound; on the applicability of commonly made approximations

To design breast ultrasound scanning systems or to test new imaging methods, various computer models are used to simulate the acoustic wave field propagation through a breast. The computer models vary in complexity depending on the applied approximations. The objective of this paper is to investigate how the applied approximations affect the...

Understanding the computational models of cerebellum using robots

Robotics has evolved since its inception and has found major applications in industries. With recent de- mand for medical and social robots, they are required to be flexible, compliant and adaptable. Today’s robots are far from performing smooth, fine co-ordinated movements that are required to be used in the fields mentioned above. Primates...

Seismic Sensitivity Analysis of Different Carbonate Lithofacies: A Full-elastic Simulation

Using a complete 2D full-elastic seismic simulation from geological modelling, to 2D seismic data forward modelling, to non-linear full-waveform inversion – the interaction of various carbonate lithofacies are observed. Specifically, three different environments of deposition within a carbonate shelf along with their pore-types ranging from...

Modeling of GPR data in a stack of VTI-layers with an analytical code

Modelling of seismic wave propagation through realistic and complex fracture networks

Rock heterogeneities exist in mostly all rock types present in the Earth’s crust. Fractures are one such heterogeneity, which can range in size from very small micro-scale diffuse fractures to huge kilometer-wide regional features and meso-scale fracture corridors. The characterisation of fracture properties has many important implications for a...

Modeling of Image Formation in Cryo-Electron Microscopy

Knowledge of the structure of biological specimens is crucial for understanding life. Cryo-electron microscopy (cryo-EM) permits structural studies of biological specimen at their near-native state. The research performed in this thesis represents one of two subprojects of the FOM industrial partnership program with FEI Company. The common aim...

Spectral harmonic analysis and synthesis of Earth’s crust gravity field

We developed and applied a novel numerical scheme for a gravimetric forward modelling of the Earth’s crustal density structures based entirely on methods for a spherical analysis and synthesis of the gravitational field. This numerical scheme utilises expressions for the gravitational potentials and their radial derivatives generated by the...

Process-Based Modelling of the Brent Delta: Influence of paleobathymetry from the Oseberg Fm. pinch out on the wave dominated Brent Delta progradation. North Sea Norwegian Sector – Huldra Field

The stratigraphic and tectonic framework of the Brent Group and their respective depositional environments is well studied and documented in the literature. The lower progradational Brent deltaic sequence is the response of a high sediment supply rate outpacing the accommodation space rate caused by subsidence and an overall sea level rise stage...

Spectral expressions for modelling the gravitational field of the Earth’s crust density structure

We derive expressions for computing the gravitational field (potential and its radial derivative) generated by an arbitrary homogeneous or laterally varying density contrast layer with a variable depth and thickness based on methods for a spherical harmonic analysis and synthesis of gravity field. The newly derived expressions are utilised in...

An r-based overview of the WRW concept

The WRW model serves the geoscientists’ community as a global language dedicated to deliver a better insight into the seismic reflection experiment. In today’s numerical modeling, wave equation-based techniques such as implemented in the WRW model are used more and more, while it becomes clear that ray tracing methods do not have the required...

Modelling and Inversion of Pulsed Eddy Current Data