Search Results - "Ballard, Megan S."

Characterizing the acoustic response of Thalassia testudinum leaves using resonator measurements and finite element modeling by Torres, Nicholas A., Ballard, Megan S., Lee, Kevin S., Wilson, Preston S., Naify, Christina J., Ben-avi, Aytahn

“…Seagrasses play an important role in coastal ecosystems and serve as important marine carbon stores. Acoustic monitoring techniques exploit the sensitivity of…”
Get full text

Impacts of simulated infaunal activities on acoustic wave propagation in marine sediments by Dorgan, Kelly M., Ballentine, Will, Lockridge, Grant, Kiskaddon, Erin, Ballard, Megan S., Lee, Kevin M., Wilson, Preston S.

“…The activities of infaunal organisms, including feeding, locomotion, and home building, alter sediment physical properties including grain size and sorting,…”
Get full text

Evidence of three-dimensional acoustic propagation in the Catoche Tongue by Sagers, Jason D, Ballard, Megan S, Knobles, David P

“…This paper presents observations of two classes of acoustic arrivals recorded on a sparsely populated vertical line array (VLA) moored in the center of the…”
Get full text

Three-dimensional acoustic propagation effects induced by the sea ice canopy by Ballard, Megan S.

“…This work examines three-dimensional (3D) propagation caused by interaction with the sea ice canopy using an approximate normal mode/parabolic equation hybrid…”
Get full text

Clustering analysis of a yearlong record of ambient sound on the Chukchi Shelf in the 40 Hz to 4 kHz frequency range by Ballard, Megan S., Sagers, Jason D.

“…Changes in the Arctic environment with regard to declining sea ice are expected to alter the ambient sound field, affecting both the sound generating processes…”
Get full text

Evaluating machine learning architectures for sound event detection for signals with variable signal-to-noise-ratios in the Beaufort Sea by Ibrahim, Malek, Sagers, Jason D., Ballard, Megan S., Le, Minh, Koutsomitopoulos, Vasilis

“…This paper explores the challenging polyphonic sound event detection problem using machine learning architectures applied to data recorded in the Beaufort Sea…”
Get full text

Modeling three-dimensional propagation in a continental shelf environment by Ballard, Megan S.

“…An acoustic propagation model is applied to predict measurements of three-dimensional (3-D) effects recorded off the southeast coast of Florida. The measured…”
Get full text

Measurements and modeling of acoustic propagation in a scale model canyon by Ballard, Megan S., Sagers, Jason D.

“…Two scale-model acoustic propagation experiments were conducted in a laboratory tank to investigate three-dimensional (3D) propagation effects induced by…”
Get full text

Scale model observations of coupled vertical modes in a translationally invariant wedge by Sagers, Jason D., Ballard, Megan S.

“…Scale-model tank experiments offer a controlled environment in which to make underwater acoustic propagation measurements that can provide high-quality data…”
Get full text

Model-data comparison of sound propagation in a glacierized fjord with a simulated brash ice surface by Zeh, Matthew C, Ballard, Megan S, Glowacki, Oskar, Deane, Grant B, Wilson, Preston S

“…Glacier ice loss impacts sound propagation within Arctic fjords. Regular calving events contribute to a collection of floating ice fragments, known as brash…”
Get full text

Impacts of infauna, worm tubes, and shell hash on sediment acoustic variability and deviation from the viscous grain shearing model by Lee, Kevin M., Venegas, Gabriel R., Ballard, Megan S., Dorgan, Kelly M., Kiskaddon, Erin, McNeese, Andrew R., Wilson, Preston S.

“…Infauna influence geoacoustic parameters in surficial marine sediments. To investigate these effects, an experiment was conducted in natural sand-silt sediment…”
Get full text

Estimation of source range using horizontal multipath in continental shelf environments by Ballard, Megan S

“…A method to estimate source range in environments that exhibit three-dimensional propagation effects is presented. A hybrid modeling technique using vertical…”
Get full text

Temporal and spatial dependence of a yearlong record of sound propagation from the Canada Basin to the Chukchi Shelf by Ballard, Megan S, Badiey, Mohsen, Sagers, Jason D, Colosi, John A, Turgut, Altan, Pecknold, Sean, Lin, Ying-Tsong, Proshutinsky, Andrey, Krishfield, Richard, Worcester, Peter F, Dzieciuch, Matthew A

“…The Pacific Arctic Region has experienced decadal changes in atmospheric conditions, seasonal sea-ice coverage, and thermohaline structure that have…”
Get full text

Observation of out-of-plane ambient noise on two vector sensor moorings in Lake Travis by Sagers, Jason D., Lenhart, Richard D., Ballard, Megan S.

“…Two Autonomous Underwater Multi-Dimensional Acoustic Recorders (AUMDAR) were deployed in the southeastern part of Lake Travis during the summer of 2018. Each…”
Get full text

A multi-year study of acoustic propagation and ambient sound in a Thalassia testudinum seagrass meadow in a shallow sub-tropical lagoona by Ballard, Megan S., Lee, Kevin M., Capistrant-Fossa, Kyle A., McNeese, Andrew R., Cushing, Colby W., Jerome, Thomas S., Taylor, Robert T., Dunton, Kenneth H., Wilson, Preston S.

“…Seagrasses provide a multitude of ecosystem services and act as important carbon sinks. However, seagrass habitats are declining globally, and they are among…”
Get full text

Direct measurements of sediment geoacoustic properties in the New England Mud Patch and shelf breaka by Ballard, Megan S., Garcia, Dante D., Lee, Kevin M., Venegas, Gabriel R., McNeese, Andrew R., Wilson, Preston S., Chaytor, Jason D.

“…This paper reports on an original set of direct sound speed measurements collected with the acoustic coring system in the New England Mud Patch (NEMP) and…”
Get full text

Measurements of Geologic Characteristics and Geophysical Properties of Sediments From the New England Mud Patch by Chaytor, Jason D., Ballard, Megan S., Buczkowski, Brian J., Goff, John A., Lee, Kevin M., Reed, Allen H., Boggess, Allyson A.

“…The characterization of physical, geological, and geophysical properties of sediments within the New England Mud Patch (NEMP) was undertaken to provide a…”
Get full text

Trans-dimensional inversion for seafloor properties for three mud depocenters on the New England shelf under dynamical oceanographic conditionsa by Bonnel, Julien, Dosso, Stan E., Hodgkiss, William S., Ballard, Megan S., Garcia, Dante D., Lee, Kevin M., McNeese, Andrew R., Wilson, Preston S.

“…This paper presents inversion results for three datasets collected on three spatially separated mud depocenters (hereafter called mud ponds) during the 2022…”
Get full text

In Situ Measurements of Compressional Wave Speed During Gravity Coring Operations in the New England Mud Patch by Ballard, Megan S., Lee, Kevin M., McNeese, Andrew R., Wilson, Preston S., Chaytor, Jason D., Goff, John A., Reed, Allen H.

“…This paper presents measurements of sediment sound-speed profiles measured in situ using the acoustic coring system (ACS). The reported measurements were…”
Get full text

Examining the effects of microstructure on geoacoustic parameters in fine-grained sediments by Ballard, Megan S., Lee, Kevin M.

“…This paper presents a set of controlled laboratory experiments designed to develop a basis for understanding the relationship between microscopic and…”
Get full text