Newhall Arthur E.

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Newhall
First Name
Arthur E.
ORCID
0000-0003-1254-530X

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  • Technical Report
    Acoustic and oceanographic observations collected during the Nomans Island experiment in Spring 2017
    (Woods Hole Oceanographic Institution, 2020-07) Johnson, Hansen D. ; Newhall, Arthur E. ; Lin, Ying-Tsong ; Baumgartner, Mark F.
    The Woods Hole Oceanographic Institution (WHOI) has developed a digital acoustic monitoring (DMON) instrument and low-frequency detection and classification system (LFDCS) to detect and classify baleen whales in near real-time from autonomous platforms. This document provides a detailed description of the data, sensors, and research activities pertaining to the Nomans Island experiment, which was designed to evaluate the range-dependent accuracy of the DMON/LFDCS on mobile and fixed platforms. The experiment took place over a 4-week period (28 Feb to 31 Mar) in the spring of 2017 at a shallow (30m) site approximately 15 km Southwest of Martha’s Vineyard, USA. A DMON/LFDCS-equipped Slocum glider was deployed alongside an extant DMON/LFDCS moored buoy to provide the means to compare system performance between platforms. Vertical and horizontal hydrophone line arrays were deployed in the same area to facilitate call localization. A short transmission loss trial was conducted shortly after the array deployments. The Slocum glider and several sensors mounted to the arrays provided environmental data to characterize variability in water column structure and sound speed during the study period.
  • Article
    Characterization of impact pile driving signals during installation of offshore wind turbine foundations
    ( 2020-04-17) Amaral, Jennifer L. ; Miller, James H. ; Potty, Gopu R. ; Vigness-Raposa, Kathleen J. ; Frankel, Adam S. ; Lin, Ying-Tsong ; Newhall, Arthur E. ; Wilkes, Daniel R. ; Gavrilov, Alexander N.
    Impact pile driving creates intense, impulsive sound that radiates into the surrounding environment. Piles driven vertically into the seabed generate an azimuthally symmetric underwater sound field whereas piles driven on an angle will generate an azimuthally dependent sound field. Measurements were made during pile driving of raked piles to secure jacket foundation structures to the seabed in waters off the northeastern coast of the U.S. at ranges between 500 m and 15 km. These measurements were analyzed to investigate variations in rise time, decay time, pulse duration, kurtosis, and sound received levels as a function of range and azimuth. Variations in the radiated sound field along opposing azimuths resulted in differences in measured sound exposure levels of up to 10 dB and greater due to the pile rake as the sound propagated in range. The raked pile configuration was modeled using an equivalent axisymmetric FEM model to describe the azimuthally dependent measured sound fields. Comparable sound level differences in the model results confirmed that the azimuthal discrepancy observed in the measured data was due to the inclination of the pile being driven relative to the receiver.
  • Article
    Acoustic detection range of right whale upcalls identified in near-real time from a moored buoy and a Slocum glider
    (Acoustical Society of America, 2022-04-13) Johnson, Hansen D. ; Taggart, Christopher T. ; Newhall, Arthur E. ; Lin, Ying-Tsong ; Baumgartner, Mark F.
    The goal of this study was to characterize the detection range of a near real-time baleen whale detection system, the digital acoustic monitoring instrument/low-frequency detection and classification system (DMON/LFDCS), equipped on a Slocum glider and a moored buoy. As a reference, a hydrophone array was deployed alongside the glider and buoy at a shallow-water site southwest of Martha's Vineyard (Massachusetts, USA) over a four-week period in spring 2017. A call-by-call comparison between North Atlantic right whale upcalls localized with the array (n = 541) and those detected by the glider or buoy was used to estimate the detection function for each DMON/LFDCS platform. The probability of detection was influenced by range, ambient noise level, platform depth, detection process, review protocol, and calling rate. The conservative analysis of near real-time pitch tracks suggested that, under typical conditions, a 0.33 probability of detection of a single call occurred at 6.2 km for the buoy and 8.6–13.4 km for the glider (depending on glider depth), while a 0.10 probability of detection of a single call occurred at 14.4 m for the buoy and 22.6–27.5 km for the glider. Probability of detection is predicted to increase substantially at all ranges if more than one call is available for detection.
  • Article
    Acoustic ducting by shelf water streamers at the New England shelfbreak
    (Acoustical Society of America, 2023-08-01) Johnson, Jennifer J. ; Lin, Ying-Tsong ; Newhall, Arthur E. ; Gawarkiewicz, Glen G. ; Knobles, David P. ; Chaytor, Jason D. ; Hodgkiss, William S.
    Greater sound speed variability has been observed at the New England shelfbreak due to a greater influence from the Gulf Stream with increased meander amplitudes and frequency of Warm Core Ring (WCR) generation. Consequently, underwater sound propagation in the area also becomes more variable. This paper presents field observations of an acoustic near-surface ducting condition induced by shelf water streamers that are related to WCRs. The field observations also reveal the subsequent disappearance of the streamer duct due to the passage of a WCR filament. These two water column conditions are investigated with sound propagation measurements and numerical simulations.