A5019294850- Particle Dynamics in Fluid Flows
- Microplastics and Plastic Pollution
- Aeolian processes and effects
- Recycling and Waste Management Techniques
- Ocean Waves and Remote Sensing
- Marine Biology and Environmental Chemistry
- Hydrology and Sediment Transport Processes
- Geological and Geochemical Analysis
- Micro and Nano Robotics
- Coastal and Marine Dynamics
- earthquake and tectonic studies
- Fluid Dynamics and Vibration Analysis
- Tropical and Extratropical Cyclones Research
- Granular flow and fluidized beds
- Geological and Geophysical Studies
- Wind and Air Flow Studies
- nanoparticles nucleation surface interactions
- Coastal wetland ecosystem dynamics
- Mineral Processing and Grinding
- Fluid Dynamics and Turbulent Flows
- Marine and coastal plant biology
- Marine and Offshore Engineering Studies
- Marine Biology and Ecology Research
- Marine and fisheries research
- Fluid Dynamics and Heat Transfer
University of Washington
2020-2025
Western Washington University
2024
Woods Hole Oceanographic Institution
2020-2022
Stanford University
2017-2019
Mechanics' Institute
2017-2018
Eastern Kentucky University
2004
In May 2021, the M/V X-Press Pearl cargo ship caught fire 18 km off west coast of Sri Lanka and spilled ∼1680 tons spherical pieces plastic or "nurdles" (∼5 mm; white in color). Nurdles are preproduction used to manufacture a wide range end products. Exposure combustion, heat, chemicals led agglomeration, fragmentation, charring, chemical modification plastic, creating an unprecedented complex spill visibly burnt unburnt nurdles. These span continuum colors, shapes, sizes, densities with...
The problem of predicting microplastic transport in oceans and estuaries has spurred new research into fluid-particle interactions involving theory, simulations, laboratory experiments. We discuss wide-ranging challenges including the modeling inertial particles waves turbulence, particle transformation, influence submesoscale ocean processes, global transport.
Abstract Separating the effects of waves and turbulence in oceanographic time series is an ongoing challenge because surface wave motion fluctuations can occur at overlapping frequencies. Therefore, simple bandpass filters cannot effectively separate their dynamics. While more advanced decomposition techniques have been developed, they often entail restrictive assumptions about interactions, require synchronized measurements, and/or only decompose signal spectrally without a time-series...
Using a numerical model, we analyse the effects of shape on both orientation and transport anisotropic particles in wavy flows. The are idealized as prolate oblate spheroids, consider regime small Stokes particle Reynolds numbers. We find that preferentially align into shear plane with mean is solely function their aspect ratio. This alignment, however, differs from Jeffery orbits occur residual flow (that is, drift velocity field) absence waves. Since drag an depends its alignment flow,...
Abstract Increasingly, researchers are using innovative methods to census marine life, including identification of environmental DNA (eDNA) left behind by organisms in the water column. However, little is understood about how eDNA distributed ocean, given that mobile and physical biological processes can transport after release from a host. Particularly vast mesopelagic ocean where many species vertically migrate hundreds meters diurnally, it important link location at which was shed host...
Abstract Predicting the vertical distribution of microplastics in ocean surface mixed layer is necessary for extrapolating measurements and comparing observations across conditions. The competing mechanisms that control are particle buoyancy, which primarily a function properties drives to accumulate at surface, turbulent mixing, disperses throughout depends on local hydrodynamics. In this study, we focused physical collected within one profile North Pacific. We measured size, shape, rise...
Particulate matter in the environment, such as sediment, marine debris and plankton, is transported by surface waves. The transport of these inertial particles different from that fluid parcels described Stokes drift. In this study, we consider negatively buoyant settle flow induced waves linear wave theory arbitrary depth. We fall under both a drag regime low Reynolds number limit nonlinear transitional range. Based on an analysis typical applications, find most widely applicable. From...
We report a theoretical study of the angular dynamics small, non-inertial spheroidal particles in linear wave field. recover observation recently reported by DiBenedetto et al. ( J. Fluid Mech. , vol. 837, 2018, pp. 320–340) that orientation these spheroids tends to stable limit cycle consisting preferred value with superimposed oscillation. show this behaviour is consequence finite amplitude and analogue Stokes drift. derive expressions for both particles, which depends only on particle...
Nonspherical particles in the ocean are relevant to phenomena such as microplastics, plankton and sediment. Experimental results of orientation dynamics nonspherical waves find competition between inertial effects on particle orientation.
Motivated by the problem of microplastics in ocean, we experimentally investigate settling plastic rods, disks, and spheres wavy flows. We find that particle average vertical velocity can both increase decrease waves, relative to quiescent flow. This variation is a function flow inertia at length scale, characterized Reynolds number Re${}_{p}$, also shape. even though velocities between particles remain constant with nonuniformly sample as shape Re${}_{p}$.
We present the results of a set experiments designed to measure dispersion non-spherical particles in wave–current flow. released negatively buoyant discs, rods and unit-aspect-ratio cylinders into flow both with without waves analysed their respective landing positions quantify how much they had dispersed while found that presence significantly increased particles, magnitude this increase depends on particle shape volume. In particular, thinner discs have greater relative than thicker...
The dispersal of buoyant particles in the ocean mixed layer is influenced by a variety physical factors including wind, waves, and turbulence. Microplastics observations are often made at free surface, which strongly forced surface gravity waves. Many studies using numerical simulations to examine how turbulence wave effects (e.g. breaking Langmuir circulation) control particle however, not phase-resolving. Therefore, an unsteady due waves remain unknown this context. Using models analytical...
Crystal aggregates that erupted at Kilauea volcano were formed in the presence of waves inside conduit before eruption.
Separating the effects of waves and turbulence in oceanographic time series is an ongoing challenge because surface wave motion fluctuations can occur at overlapping frequencies. As a result, simple bandpass filters cannot effectively separate their dynamics. While more advanced decomposition techniques have been developed, they often entail restrictive assumptions about interactions, require synchronized measurements, and/or only decompose signal spectrally without time-series...
The extent to which particles such as larvae, seagrass pollen, and microplastics are dispersed by waves currents has many ecological impacts. Here, we systematically examine the effect of a comprehensive set parameters on dispersion ellipsoidal in wave-current flow using numerical computation approach. Our results show that all considered have some particle dispersion, but settling-wave timescale ratio greatest effect.
Swimming organisms may actively adjust their behavior in response to the flow around them. Ocean flows are typically turbulent and therefore characterized by chaotic velocity fluctuations. While some studies have observed planktonic larvae altering turbulence, it is not always clear whether a plankter responding an individual turbulence fluctuation or time-averaged flow. To distinguish between these two paradigms, we conducted laboratory experiments with turbulence. We veliger of gastropod...
<title>Abstract</title> Microplastics are increasing in marine environments worldwide, but their fate is not fully understood. Reef-building corals suggested to serve as sinks for microplastics via active removal through ingestion and passive by adhesion. However, it unknown which type of plastics more likely be ingested or adhered whether water flow coral morphology affects these processes. We exposed the corals, <italic>Leptoseris sp</italic>., <italic>Montipora capitata</italic>,...
The swimming behavior of invertebrate larvae can affect their dispersal, survival and settlement in the ocean. Modeling this accurately poses unique challenges as is controlled by both physiology environmental cues. Some use cilia to swim create feeding currents, resulting potential trade-offs between two functions. Food availability naturally patchy often occurs shallow horizontal layers Also, larval motions generally differ vertical directions. In order investigate behavioral response food...