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LMR Current Projects
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Investment Area: Data to Support Risk Threshold Criteria
 
Hearing and Estimated Acoustic Impacts in Three Species of Auk: Implications for the Marbled Murrelet (Project #LMR-22)
Principal Investigator: Aran Mooney
This project is measuring the hearing of up to three Auk species to provide key hearing data needed to define acoustic criteria for the marbled murrelet.
Cuvier’s Beaked Whale and Fin Whale Behavior During Military Sonar Operations: Using Medium-term Tag Technology to Develop Empirical Risk Functions (Project #LMR-23)
Principal Investigators: Greg Schorr, Erin Falcone
The effort will generate significantly larger samples of high-resolution behavioral data, particularly for beaked whales, to support development of risk functions.
The Effects of Underwater Explosions on Fish (Project #LMR-26)
Principal Investigator: Peter Dahl
The results from this project will help to predict potential effects to fish that may occur during Navy explosives training activities.
Measuring the Effect of Range on the Behavioral Response of Marine Mammals Through the Use of Navy Sonar (Project #LMR-30)
Principal Investigator: Stephanie Watwood
To assess the effect of sonar source sources and distance (range), researchers are conducting controlled exposure experiments (CEE) with sonar from two different platforms. Each will be deployed at multiple, pre-defined distances from tagged animals to collect data on responses.
Behavioral Assessment of Auditory Sensitivity in Hawaiian Monk Seals (Project #LMR-32)
Principal Investigator: Colleen Reichmuth
Researchers are working with a specially trained adult male Hawaiian monk seal to obtain reliable measures of underwater auditory sensitivity thresholds across the full frequency range of hearing. The resulting data will be used to generate an underwater audiogram that will help to support impact assessments of the Hawaiian monk seal’s sensitivity to sound.
Temporary Threshold Shifts in Underwater Hearing Sensitivity in Freshwater and Marine Turtles (Project #LMR-40)
Principal Investigators: Aran Mooney, Wendy Dow Piniak
This project is examining TTS in aquatic turtles and will potentially provide the initial sound exposure levels that induce these temporary threshold shifts. Resulting data could improve estimates of noise impacts to both freshwater and sea turtles and guide the development of a TTS study with sea turtles.
Frequency-dependent, Underwater Temporary Threshold Shift in California Sea Lions (Project #LMR-45)
Principal Investigator: Ron Kastelein
This project focuses on measuring TTS and hearing recovery in California sea lions (Zalophus californianus) for deriving auditory weighting functions.
Standardizing Auditory Evoked Potential Hearing Thresholds with Behavioral Hearing Thresholds (Project #LMR-47)
Principal Investigator: Dorian Houser
By measuring behavioral and AEP hearing thresholds in the same individual bottlenose dolphins across the range of hearing, this project’s team will determine the frequency-dependent relationship between behavioral and AEP thresholds. The results of behaviorally equivalent AEP audiograms could substantially increase the data available for developing auditory weighting functions.
Loudness Perception in Killer Whales (Orcinus orca); Effects of Temporal and Frequency Summation (Project #LMR-50)
Principal Investigator: Brian Branstetter
This project is investigating perceived loudness in killer whales by determining the effect of signal duration on both response latency and detection thresholds, as well as determining the subjective loudness of short duration signals compared to long-duration signals.
Dependence of TTS on Exposure Duration During Simulated Continuously Active Sonar (Project #LMR-51)
Principal Investigator: Jason Mulsow
This project is measuring temporary threshold shift (TTS) in the bottlenose dolphin using auditory evoked potential (AEP) and behavioral threshold measurements for longer duration signal exposure with signal qualities simulating continuously active sonar (CAS). The focus is to determine if equal energy exposures result in equal TTS, independent of exposure duration.
Studying Marine Mammal Behavioral Response to Surveillance Towed Array Sensor System Low Frequency Active (SURTASS LFA) Sonar (Projects #LMR-52,53,54)
Principal Investigators: (#52) Adam Frankel, (#53) John Calambokidis, (#54) Stephanie Watwood
The overall goal of this two-phase effort is to update previous studies done with LFA sources during the 1990s, based on lessons learned and best practices from controlled and observational behavioral response studies using other sonar sources conducted over the last 10 years. As part of the Phase I feasibility study, these projects are investigating the best approach to designing a scientific study to assess behavioral response to LFA sonar.
Dolphin Conditioned Hearing Attenuation (Project #LMR-55)
Principal Investigator: James Finneran
This work, co-funded by the LMR program and the Naval Innovative Science and Engineering (NISE) program, is assessing conditioned hearing attenuation in bottlenose dolphins. The project will measure how quickly dolphins can learn to suppress (i.e., attenuate) their hearing in anticipation of an impending intense sound, determine how long they can maintain the attenuation and assess the role of outer hair cells in the conditioned hearing change.
 
Investment Area: Data Processing and Analysis Tools
 
DenMod: Working Group for the Advancement of Marine Species Density Surface Modeling (Project #LMR-31)
Principal Investigator: Len Thomas
This effort is coordinating a group of density surface modeling (DSM) specialists to assess the varied approaches to and coordinate advances on using DSM models. These experts are focused on developing and implementing innovative approaches to improve spatial modeling methods used to characterize seasonal abundance and distribution of marine species, particularly in U.S. Navy training and testing areas.
ACCURATE: ACoustic CUe RATEs for Passive Acoustics Density Estimation (Project #LMR-42)
Principal Investigator: Tiago Marques
This project is working to provide a comprehensive, quantitative synthesis of the current state of knowledge on acoustic cue rates and cue stability for marine mammal density estimation from passive acoustics.
MSM4PCoD: Marine Species Monitoring for the Population Consequences of Disturbance (Project #LMR-43)
Principal Investigator: Cormac Booth
This project is reviewing the US Navy Marine Species Monitoring (MSM) program and will make recommendations for how future efforts can inform future Population Consequences of Disturbance (PCoD) analyses.
Demonstration and Validation of Passive Acoustic Density Estimation for Right Whales (Project #LMR-44)
Principal Investigators: Susan Parks, Len Thomas
This project is focused on demonstrating passive acoustic density estimation methods and validating these methods using concurrent visual density estimation techniques.
Combining Global OBS and CTBTO Recordings to Estimate Abundance and Density of Fin and Blue Whales (Project #LMR-49)
Principal Investigator: Danielle Harris
This project is working to demonstrate and refine a suite of density estimation methods using data from sparse arrays, in which sensors may be distributed evenly but widely over a large area of interest. Sparse array examples include Ocean Bottom Seismometers (OBS) and Comprehensive Nuclear Test Ban Treaty Organization International Monitoring System (CTBTO IMS) recorders.
 
Investment Area: Monitoring Technology Demonstrations
 
Improved Tag Attachment System for Remotely-deployed Medium-term Cetacean Tags (Project #LMR-41)
Principal Investigators: Russel Andrews, Greg Schorr
This project seeks to demonstrate the feasibility of producing an alternative tag attachment anchor element for remotely-deployed tags.
 
Investment Area: Standards and Metrics
 
Standardizing Methods and Nomenclature for Automated Detection of Navy Sonar (Project #LMR-34)
Principal Investigators: Elizabeth Henderson and Susan Jarvis
This project is seeking to develop a set of standardized detectors and classifiers, along with a set of standardized nomenclature, for Navy sonar signals.
Capability enhancements for Tethys, a passive acoustic metadata workbench (Project #LMR-46)
Principal Investigator: Marie Roch
This project is enhancing and updating the Tethys user interface, features and technology to increase useability and security.
 
Investment Area: Emergent Topics
 
Multi-spaced Measurement of Underwater Sound Fields from Explosive Sources (Project #LMR-35)
Principal Investigator: Peter Dahl
This project will conduct calibrated underwater acoustic field measurements associated with explosive detonations, which will be used to update the Navy’s Acoustic Effects Model.
Collection of in situ Acoustic Data for Validation of U.S. Navy Propagation Models of Ship Shock Trial Sound Sources (Project #LMR-48)
Principal Investigators: Kerri Seger, Shyam Madhusudhana and Holger Klinck
This project is collecting relevant in situ data on the acoustic shock wave propagation during the full ship shock trial of the new Navy aircraft carrier, USS Gerald R. Ford (CVN-78). The data will help the Navy to validate the underlying acoustic propagation model used within the Navy Acoustic Effects Model (NAEMO).
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