Full-waveform inversion (FWI) is today a standard process for the inverse problem of seismic imaging. PDE-constrained optimization used to determine unknown parameters in wave equation that represent geophysical properties. The objective function measures misfit between observed data and calculated synthetic data, it has traditionally been least-squares norm. In sequence papers, we introduced W...

Portugal and Spain have a cross-border cooperation protocol on wildfires response for buffer strip of 25 km each side the border. In spite success this collaboration, there are issues to be improved, since Portuguese Spanish authorities use different methodologies assess daily fire danger. A methodology harmonize danger its interpretation by Civil protection in transboundary area is hereby pres...

Forest fire risk in Finland is estimated with the Finnish Fire Index (FFI), which predicts fuel moisture content (FMC) of forest floor. We studied FMC variation four typical ground vegetation fuels, Pleurozium schreberi, Hylocomium splendens, Dicranum spp., and Cladonia raw humus mature recently clear-cut stands. Of these, six were sub-xeric Pinus sylvestris stands, mesic Picea abies analysed a...

Wavefield reconstruction inversion (WRI) formulates a PDE-constrained optimization problem to reduce cycle skipping in full-waveform (FWI). WRI often requires expensive matrix inversions reconstruct frequency-domain wavefields. Physics-informed neural network (PINN) uses the underlying physical laws as loss functions train (NN), and it has shown its effectiveness solving Helmholtz equation gene...

Chlordecone (CLD) was an organochlorine insecticide whose previous use resulted in an extensive pollution of the environment with severe health effects and social consequences. A closely related compound, 5b-hydrochlordecone (5b-hydroCLD), has been searched for and often detected in environmental matrices from the geographical area where CLD was applied. The current consensus considered that it...

This paper proposes a strategy for managing wildfire risks and preventing blackouts using microgrids. To demonstrate this approach, not seen in previous literature, we use the power network of Victoria, Australia, December 2019 as case study. The Fire Weather Index (FWI) is crucial indicator global fire behaviour both spatially temporally, proved with its robust analysis within many studies. FW...

Future fire weather conditions under climate change were investigated based on the Fire Weather Index (FWI), Initial Spread (ISI) and threshold-specific indicators in Greece. The indices calculated from datasets derived high-resolution validated simulations of 5 km. dynamical downscaled with WRF model driven by EC-Earth output for historical (1980–2004) future periods, two Representative Concen...

Seismic full waveform inversion (FWI) uses the gradient of the objective function for computing model updates. This requires computation of the forward and adjoint wavefields on the current model estimate. Calculating the gradient on the full computational domain is wasteful when it is only required in a limited region of interest, as is the case in 4D seismic and salt boundary estimation, for ...

Full Waveform Inversion (FWI) is a promising seismic imaging method. It aims at computing quantitative estimates of the subsurface parameters (bulk wave velocity, shear wave velocity, rock density) from local measurements of the seismic wavefield. Based on a particular wave propagation engine for wavefield estimation, it consists in minimizing iteratively the distance between the predicted wave...

Abstract Recent studies have shown that temperature and precipitation in the Mediterranean are expected to change, contributing longer more intense summer droughts even extend out of season. In connection this, frequency forest fire occurrence intensity will likely increase. present study, changes future danger conditions assessed for different regions Greece using Canadian weather index (FWI)....