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Book
Tracer and Timescale Methods for Passive and Reactive Transport in Fluid Flows
Authors: --- ---
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Geophysical, environmental, and urban fluid flows (i.e., flows developing in oceans, seas, estuaries, rivers, aquifers, reservoirs, etc.) exhibit a wide range of reactive and transport processes. Therefore, identifying key phenomena, understanding their relative importance, and establishing causal relationships between them is no trivial task. Analysis of primitive variables (e.g., velocity components, pressure, temperature, concentration) is not always conducive to the most fruitful interpretations. Examining auxiliary variables introduced for diagnostic purposes is an option worth considering. In this respect, tracer and timescale methods are proving to be very effective. Such methods can help address questions such as, "where does a fluid-born dissolved or particulate substance come from and where will it go?" or, "how fast are the transport and reaction phenomena controlling the appearance and disappearance such substances?" These issues have been dealt with since the 19th century, essentially by means of ad hoc approaches. However, over the past three decades, methods resting on solid theoretical foundations have been developed, which permit the evaluation of tracer concentrations and diagnostic timescales (age, residence/exposure time, etc.) across space and time and using numerical models and field data. This book comprises research and review articles, introducing state-of-the-art diagnostic theories and their applications to domains ranging from shallow human-made reservoirs to lakes, river networks, marine domains, and subsurface flows

Keywords

residence time --- Three Gorges Reservoir --- tributary bay --- density current --- water level regulation --- marina --- water renewal --- transport timescales --- return-flow --- macro-tidal --- wind influence --- floating structures --- San Francisco Estuary --- Sacramento–San Joaquin Delta --- water age --- transport time scales --- hydrodynamic model --- tidal hydrodynamics --- stable isotopes --- reactive tracers --- tailor-made tracer design --- hydrogeological tracer test --- kinetics --- partitioning --- Mahakam Delta --- age --- exposure time --- return coefficient --- CART --- source water fingerprinting --- floodplain --- turbulence --- ADCP measurement --- wave bias --- Reynolds stress --- transport process --- passive tracers --- terrestrial dissolved substances --- Pearl River Estuary --- shallow lake --- meteorological influence --- sub-basins --- Delft3D --- partial differential equations --- boundary conditions --- geophysical and environmental fluid flows --- reactive transport --- interpretation methods --- diagnostic timescales --- age distribution function --- radionuclide --- tracer --- data collection --- antimony 125 (125Sb) --- tritium (3H) --- dispersion --- modeling --- English Channel --- North Sea --- Biscay Bay --- timescale --- transport --- hydrodynamic --- ecological --- biogeochemical --- coastal --- estuary --- flushing time --- shallow reservoir --- numerical modeling --- Lagrangian transport modelling --- coupled wave–ocean models --- ocean drifters --- wave-induced processes --- model skills --- n/a --- Sacramento-San Joaquin Delta --- coupled wave-ocean models


Book
Antimicrobial Resistance and Virulence Mechanisms
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Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The worldwide emergence of antimicrobial-resistant bacteria, specially those resistant to last-resource antibiotics, is now a common problem being defined as one of three priorities for the safeguarding of One Health by the Tripartite Alliance, which includes the World Health Organization (WHO), the Food and Agriculture Organization (FAO) and the Office International des Epizooties (OIE). Bacteria resistance profiles, together with the expression of specific virulence markers, have a major influence on the outcomes of infectious diseases. These bacterial traits are interconnected, since not only the presence of antibiotics may influence bacterial virulence gene expression and consequently infection pathogenesis, but some virulence factors may also contribute to an increased bacterial resistance ability, as observed in biofilm-producing strains. The surveillance of important resistant and virulent clones and associated mobile genetic elements is essential for decision making in terms of mitigation measures to be applied for the prevention of such infections in both human and veterinary medicine. However, the role of natural environments as important components of the dissemination cycle of these strains has not been consider until recently. This Special Issue aims to publish manuscripts that contribute to the understanding of the impact of bacterial antimicrobial resistance and virulence in the three areas of the One Health triad–i.e., animal, human and environmental health.

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