A5027026051- Oceanographic and Atmospheric Processes
- Underwater Vehicles and Communication Systems
- Marine and coastal ecosystems
- Underwater Acoustics Research
- Climate variability and models
- Marine and fisheries research
- Arctic and Antarctic ice dynamics
- Robotic Path Planning Algorithms
- Maritime Navigation and Safety
- Complex Systems and Time Series Analysis
- Ocean Waves and Remote Sensing
- Stock Market Forecasting Methods
- Cryospheric studies and observations
- Neural Networks and Applications
- Meteorological Phenomena and Simulations
- Fuzzy Logic and Control Systems
- Evolutionary Algorithms and Applications
- Gastrointestinal disorders and treatments
- Tracheal and airway disorders
- Water Quality Monitoring Technologies
- Coral and Marine Ecosystems Studies
- Marine animal studies overview
- Tropical and Extratropical Cyclones Research
- Methane Hydrates and Related Phenomena
- Amphibian and Reptile Biology
California Institute of Technology
2025
NATO Centre for Maritime Research and Experimentation
2003-2024
North Atlantic Treaty Organization
2011-2024
Centro Nacional de Microbiologia
2024
Instituto de Salud Carlos III
2024
Instituto Politécnico Nacional
2023
Ollscoil na Gaillimhe – University of Galway
2023
Complejo Hospitalario de Salamanca
2017-2023
University of Würzburg
2023
Mediterranean Institute for Advanced Studies
1999-2019
This paper proposes a genetic algorithm (GA) for path planning of an autonomous underwater vehicle in ocean environment characterized by strong currents and enhanced space-time variability. The goal is to find safe that takes the from its starting location mission-specified destination, minimizing energy cost. GA includes novel operators ensure convergence global minimum even cases where structure (in space time) current field implies existence different local minima. performance these...
Autonomous Underwater Vehicles (AUVs) operate in ocean environments characterized by complex spatial variability which can jeopardize their missions. To avoid this, planning safety routes with minimum energy cost is of primary importance. This work explores the benefits, terms cost, path marine showing certain variability. Extensive computations have been carried out to calculate, means an A* search procedure, optimal paths on different length scale eddies and current intensities. get...
Abstract In 1953, Morton Levin introduced a simple approach to estimating population attributable fractions (PAF) depending only on risk factor prevalence and relative risk. This formula its extensions are still in widespread use today, particularly estimate PAF populations where individual data is unavailable. Unfortunately, Levin’s known be asymptotically biased for the when factor-disease relationship confounded even if risks that correctly adjusted confounding used estimator. Here we...
The value of global (e.g. altimetry, satellite sea-surface temperature, Argo) and regional radars, gliders, instrumented mammals, airborne profiles biogeochemical) observation-types for monitoring the mesoscale ocean circulation biogeochemistry is demonstrated using a suite prediction systems remotely-sensed data. A range techniques used to demonstrate different benefit high-resolution adaptive sampling circulation. include Observing System Experiments, Simulation adjoint sensitivities,...
Abstract Consistent between‐individual differences in movement are widely recognised across taxa. In addition, foraging plasticity at the within‐individual level suggests a behavioural dependency on internal energy demand. Because behaviour co‐varies with fast‐slow life history ( LH ) strategies an adaptive context, as theoretically predicted by pace‐of‐life syndrome hypothesis, mass/energy fluxes should link and its physiology both between‐ levels. However, mechanistic framework driving...
Frequently, autonomous underwater vehicles (AUVs) must operate in turbulent ocean environments with complex spatio-temporal variability. Energetic flows, instabilities and currents can strongly perturb safety conditions development of AUVs operations. A priori knowledge this variability would allow to adequately plan AUV missions, minimizing the possible negative effects environment on its operation. Unfortunately, present oceanographic technology is only capable forecast large slow...
Abstract Ocean observing systems (OOSs) constituted by moorings and gliders are becoming relevant in oceanographic climate studies. In these networks, the temporal variability is captured mooring observations, while spatial obtained from sampling surrounding area. The advent of this capability brings need to find optimal procedures sample a given ocean region with glider presence neighboring mooring, order maximize information content data collected network. Different criteria (e.g., A, G,...
We present results from a study of the modifications induced by short‐timescale response shelf break baroclinic jet to presence downstream canyon. The field site was Canyon Palamós, located in northeastern edge Spain. To determine short time scale variability area, three intensive surveys were carried out at approximately 10‐day intervals. Data indicate that jet's location, usually over slope, is subjected significant onshore‐offshore displacements. Analysis data has shown importance...
The interaction of eddies with seafloor topography can exert large systematic forces on ocean circulation. Using a statistical mechanics approach it is possible to obtain parametrization this effect (the Neptune effect) for application in large‐scale circulation models. Circulation the western Mediterranean has been observed follow definite cyclonic path. Numerical models usually show good qualitative agreement but deficiencies at subbasin scale. We have tested importance Sea. To perform...
This paper aims to enhance the reliability of underwater acoustic (UWA) communications by evaluating effectiveness various Forward Error Correction (FEC) codes. In absence standardized UWA physical layer simulators, we rely on in-situ data assess performance six FEC codes: convolutional, turbo, Low-Density Parity Check (LDPC), Bose– Chaudhuri–Hocquenghem (BCH), Turbo Product Code (TPC), and polar. We examine two common payload sizes: 128-bit packets at a 1/5 encoding rate 1024-bit 1/2 rate....
We propose a nonlinear ocean forecasting technique based on combination of genetic algorithms and empirical orthogonal function (EOF) analysis. The method is used to forecast the space‐time variability sea surface temperature (SST) in Alboran Sea. algorithm finds equations that best describe behaviour different temporal amplitude functions EOF decomposition and, therefore, enables global future time‐variability.
Acoustic wave propagation in liquid media containing many air-filled bubbles is ab initio considered. A self-consistent method used to derive a set of coupled equations describing rigorously the multiple scattering waves such media. The transmission and backscattering are then solved exactly. numerical results indicate localization acoustic range frequency.
This paper describes an optimal sampling approach to support glider fleet operators and marine scientists during the complex task of planning missions fleets underwater gliders. Optimal sampling, which has gained considerable attention in last decade, consists paths gliders minimize a specific criterion pertinent phenomenon under investigation. Different criteria (e.g., A, G, or E optimality), used geosciences obtain optimum design, lead different strategies. In particular, A produces for...
Monitoring ocean dynamics is extremely difficult due to its enormous physical dimensions and the wide range of spatio-temporal scales involved in dynamical behaviour. It has been recently proposed that most efficient way monitor through networks small, intelligent cheap robotic platforms. Drifting profiling floats gliders were developed this context. Floats move with currents meanwhile they periodically sample water column controlled immersions. Conversely, are underwater autonomous vehicles...
Quasi‐synoptic temperature, salinity, and oxygen measurements in the Adriatic northern Ionian Seas (Mediterranean Sea) during two different winter conditions are presented. In addition to confirmation of previous knowledge about deepwater formation eastern Mediterranean, give more insight into processes Sea and, especially, fate dense low‐salinity water masses transported by West Current (WAC) its spreading Sea. A mild season without production shallow areas was encountered a cruise February...