A5017835283- Underwater Acoustics Research
- Marine animal studies overview
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Bat Biology and Ecology Studies
- Animal Vocal Communication and Behavior
- Underwater Vehicles and Communication Systems
- Arctic and Antarctic ice dynamics
- Environmental Monitoring and Data Management
- Guidance and Control Systems
- Educational Robotics and Engineering
- Cephalopods and Marine Biology
- Inertial Sensor and Navigation
- Aerospace Engineering and Energy Systems
- Flow Measurement and Analysis
- Paleontology and Evolutionary Biology
- Computational Physics and Python Applications
- Structural Health Monitoring Techniques
- Target Tracking and Data Fusion in Sensor Networks
- Blind Source Separation Techniques
- Advanced Computational Techniques and Applications
- Phonocardiography and Auscultation Techniques
- Effects of Environmental Stressors on Livestock
- Scientific Computing and Data Management
- Coral and Marine Ecosystems Studies
University of Washington
2016-2024
University of Washington Applied Physics Laboratory
2017-2024
Johns Hopkins University
2015-2020
Acoustical Society of America
2020
Interacoustics (Denmark)
2020
Woods Hole Oceanographic Institution
2008-2015
University of Maryland, College Park
2014
Massachusetts Institute of Technology
2013
National Taiwan University
2013
Echolocating bats provide vital ecosystem services and can be monitored effectively using passive acoustic monitoring (PAM) techniques. Duty-cycle subsampling is used to collect PAM data at regular ON/OFF cycles circumvent battery storage capacity constraints for long-term monitoring. However, the impact of duty-cycle potential detector errors on estimating bat activity has not been systematically investigated bats. Here, we simulate influence in measuring via three metrics–Call Rate (CR),...
Arrays of up to six broadband suction cup hydrophones were placed on the forehead two bottlenose dolphins determine location where beam axis emerges and examine how signals in acoustic near-field relate far-field. Four different array geometries used; a linear one with arranged along midline forehead, around front melon at 1.4 4.2 cm above rostrum insertion, across certain locations not measured by other configurations. The was found be close melon, approximately 5.4 insert for both animals....
Cephalopods, and particularly squid, play a central role in marine ecosystems are prime model animal neuroscience. Yet, the capability to investigate these animals vivo has been hampered by inability sedate them beyond several minutes. Here, we describe methods anesthetize Doryteuthis pealeii, longfin noninvasively for up 5 h using 0.15 mol magnesium chloride (MgCl2) seawater solution. Sedation was mild, rapid (<4 min), duration could be easily controlled repeating anesthetic inductions. The...
It has long been postulated that the elongated hindwing tails of many saturniid moths have evolved to create false sonar targets divert attack echolocation-guided bat predators. However, rigorous echo-acoustic evidence support this hypothesis lacking. In study, fluttering luna (Actias luna), a species with tails, were ensonified frequency modulated chirp signals from all angles orientation and across wingbeat cycle. High-speed stereo videography was combined pulse compression processing...
When a beam emitted from an active monostatic sensor system sweeps across volume, the echoes scatterers present will fluctuate ping to due various interference phenomena and statistical processes. Observations of these fluctuations can be used, in combination with models, infer properties such as numerical density. Modeling also help predict performance associated uncertainties expected echoes. This tutorial focuses on "physics-based statistics," which is predictive form modeling...
Animals rely on sensory feedback from their environment to guide locomotion. For instance, visually guided animals use patterns of optic flow control velocity and estimate distance objects (e.g. Srinivasan et al. 1991, 1996). In this study, we investigated how acoustic information guides locomotion that hearing as a primary modality orient navigate in the dark, where visual is unavailable. We studied flight echolocation behaviors big brown bats they flew under infrared illumination through...
Animals enhance sensory acquisition from a specific direction by movements of head, ears, or eyes. As active sensing animals, echolocating bats also aim their directional sonar beam to selectively "illuminate" confined volume space, facilitating efficient information processing reducing echo interference and clutter. Such control is generally achieved head shape changes the sound-emitting mouth nose. However, lingual-echolocating Egyptian fruit bats, Rousettus aegyptiacus, which produce...
Cook Inlet, Alaska, is home to an endangered and declining population of 279 belugas ( Delphinapterus leucas ). Recovery efforts highlight a paucity basic ecological knowledge, impeding the correct assessment threats development recovery actions. In particular, information on diet foraging habitat very limited for this population. Passive acoustic monitoring has proven be efficient approach monitor beluga distribution seasonal occurrence. Identifying behavior could help address current gap...
A controlled laboratory experiment of broadband acoustic backscattering from live squid (Loligo pealeii) was conducted using linear chirp signals (60–103 kHz) with data collected over the full 360° orientation in lateral plane, &lt;1° increments. The measurements were compared an analytical prolate spheroid model and a three-dimensional numerical randomized shape, both based on distorted-wave Born approximation formulation. consistent hypothesized fluid-like scattering properties squid....
In this paper, an exact solution is derived, evaluated, and numerically validated for describing the statistics of echoes from mixed assemblages scatterers. Here, a "mixed assemblage" involves geometry in which there more than one type scatterer spatially interspersed uniformly distributed within analysis window, much larger resolution cell system (i.e., are many independent samples per window). The scatterers generally not resolvable signals narrowband. scattering backscattering direction...
A general numerical model has been developed to predict the probability density function (pdf) of magnitudes complex pulse-compressed broadband echoes (broadband echo pdf) due arbitrary aggregations scatterers that are detected with a single-beam echosounder. The is based on physics principles and rigorously accounts for frequency-dependent characteristics system, signal, scatterers, beampattern modulation effects sonar/radar transceiver. key aspect modeling statistics accounting scenarios...
The recent explosion in the availability of echosounder data from diverse ocean platforms has created unprecedented opportunities to observe marine ecosystems at broad scales. However, critical lack methods capable automatically discovering and summarizing prominent spatio-temporal echogram structures limited effective wider use these rich datasets. To address this challenge, we develop a data-driven methodology based on matrix decomposition that builds compact representation long-term time...
The beam pattern of sonar signals emitted by echolocating animals, such as bats and toothed whales, directly influences the acoustic information available for guiding task-specific behaviors. lingual bat, Rousettus aegyptiacus, emits broadband transient clicks that resemble those dolphins. are in left-right pairs, with maximum intensity slope each signal pointing toward target during navigation. However, detailed characteristics these remain unknown. Using a loosely populated...
The twilight feeding migration of fish around a shallow water artificial reef (a shipwreck) was observed by horizontal-looking, mid-frequency sonar. sonar operated at frequencies between 1.8 and 3.6 kHz consisted co-located source horizontal line array deployed 4 km from the reef. experiment conducted in well-mixed waveguide which is conducive to characterizing aggregations these distances. Large were repeatedly seen emerge rapidly shipwreck dusk, disperse into surrounding area during night,...
High-frequency sonar systems deployed on a wide array of ocean observing platforms are creating deluge water column data at an unprecedented speed from all corners the ocean. Efficient and integrative analysis these data, either across different instruments or with other oceanographic datasets, holds key to understanding response marine ecosystems rapidly changing climate. Here we present Echopype, open-source Python software library designed address this need. By standardizing diverse...
Squid are important organisms both ecologically and commercially. Acoustic scattering techniques can provide synoptic data on their distribution abundance, have the advantage of being efficient compared with traditional net sampling methods. However, knowledge properties squid is required to accurately convert acoustic into meaningful biological information. To better understand sound by squid, facilitate future model development, a controlled laboratory backscattering experiment was...
Pulse compression signal processing techniques are commonly used to identify dominant scattering features for weakly marine organisms. In cases where the organism can be accurately represented as homogeneous (e.g., eupausiids), separation of two distinct peaks in compressed pulse output (CPO) envelope produced by front and back water-tissue interfaces estimate size at some angles orientation. order investigate effect internal inhomogeneities on scattering, a 3-D distorted-wave Born...
Toothed whales have evolved to communicate, forage, and navigate effectively underwater using sound. It is generally accepted that toothed receive sounds through their lower mandible the associated fat body, which guide sound tympano-periotic complexes (TPCs) enclosing cochleae. However, little known about how direction of an impinging wave affects acoustic interactions with these other structures in head alter signals driving left right TPCs. In this work, we constructed a three-dimensional...
High-frequency echosounders are the workhorse in fisheries and marine ecological surveys. Due to inherent complexity of biological aggregations ambiguity interpreting echoes from species similar size anatomical compositions, echogram annotation typically requires combining spectral information referencing scattering physics, ground-truth nearby net-trawls, empirical school morphology specific fish species. Here, we investigate variability annotations its influence on machine learning...
Echolocating bats are important bioindicators that can be monitored effectively using passive acoustic monitoring (PAM) techniques. In PAM, duty-cycle-based temporal subsampling is often used to collect data at ON/OFF intervals circumvent the limitations of recorder battery and storage capacity enable long-term monitoring. However, potential bias introduced by has not been systematically investigated for bat Here, we use continuous audio recordings from Union Bay Natural Area in Seattle...
With the influx of large data from multiple instruments and experiments, scientists are wrangling complex pipelines that context-dependent non-reproducible. We demonstrate how we leverage Prefect (Prefect, 2024), a modern orchestration framework, to facilitate fisheries acoustics processing. built Python package Echodataflow (Echodataflow, 2024) which 1) allows users specify workflows their parameters through editing text “recipes” provide transparency reproducibility pipelines; 2) supports...
Water column sonar data collected by echosounders are essential for fisheries and marine ecosystem research, enabling the detection, classification, quantification of fish zooplankton from many different ocean observing platforms. However, broad usage these has been hindered lack modular software tools that allow flexible composition processing workflows incorporate powerful analytical in scientific Python ecosystem. We address this gap developing Echostack, a suite open-source packages...