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CATEGORIES:College of Arts and Sciences,College of Engineering,Graduate Stu
 dies,Lectures and Seminars,SMAST,STEM,Thesis/Dissertations
DESCRIPTION:Department of Estuarine and Ocean Sciences PhD Dissertation Def
 ense "Waves and Vortices in the Ocean - From Theory to Practice"By: Bailey
  Remy Advisor:Dr. Miles Sundermeyer (UMass Dartmouth) Committee Members:Dr
 . Geoffrey Cowles (UMass Dartmouth), Dr. Banafsheh Seyed-Aghazadeh (UMass 
 Dartmouth), and Dr. Marie-Pascale Lelong (NorthWest Research Associates) M
 onday May 18, 202611:00 AMSMAST East 101-103836 S. Rodney French Blvd, New
  Bedfordand via Zoom Abstract: Internal waves (IWs) are ubiquitous in the 
 ocean and contribute significantly to the global ocean energy balance by c
 ascading tidal and wind-driven energy to dissipative scales. Vortical moti
 ons (VMs), which exist at scales similar to IWs, carry potential vorticity
  (PV) and influence ocean circulation, mixing, and climate variability. Di
 stinguishing these motions remains a fundamental challenge, as nonlinear i
 nteractions in fully developed flows obscure their individual signatures. 
 This dissertation addresses two aspects of IWs and VMs in the ocean. Chapt
 ers 1 and 2 investigated mechanisms of energy exchange between IWs and VMs
 , and the physical signatures and associated dynamics of reduced stratific
 ation regions in the ocean. Chapter 3 examined the use of IW and VM signat
 ures to detect underwater wakes in realistic ocean environments. �� Chapte
 r 1 examined energy exchange between IWs and VMs in the ocean, focusing on
  the contrasting roles of linear and nonlinear flow components in shaping 
 available potential vorticity (APV) fields. In numerical simulations initi
 alized with a Garrett-Munk IW spectrum, energy was rapidly projected onto 
 the linear VM basis by nonlinear triad interactions. Idealized simulations
  of a single linear IW, a balanced vortex, and an adjusting density anomal
 y exposed limitations of the linear flow decomposition: Lagrangian particl
 e tracking revealed that linear APV differed from total APV due to nonline
 ar vortex stretching terms, causing the linear decomposition to overestima
 te the PV-carrying component of flow. These results suggest that apparent 
 rapid VM generation can sometimes reflect nonlinear artifacts rather than 
 true PV modification. Chapter 2 examined the prevalence and nature of redu
 ced stratification regions in the ocean relative to IW and VM dynamics. Oc
 cupying between ~5% and 25% of the model domain, such regions exhibited di
 stinct morphological and dynamical signatures consistent with linear theor
 y. Regions of reduced stratification that projected onto linear VMs exhibi
 ted aspect ratios exceeding the canonical N0/f��scaling, and horizontal sc
 ales exceeding the local Rossby deformation radius. Regions that projected
  onto linear IWs more closely follow theoretical wave scaling and propagat
 ion characteristics. Lagrangian particle tracking and spectral shear-to-st
 rain ratios further distinguished propagating wave motions from materially
  conserved vortical motions. Additionally, the generation of VM stratifica
 tion anomalies was found to be energetically more consistent with prolonge
 d mixing events (time scales longer than a buoyancy period) than intense s
 hort-term mixing events. These findings confirm that reduced stratificatio
 n regions in the ocean can result from both internal wave straining and pe
 rsistent vortical motions, and that certain interactions between them are 
 consistent with current dynamical understanding of both phenomena. Buildin
 g on increased understanding of the relationship between IWs and VMs in th
 e ocean, Chapter 3 explored the generation and evolution of IWs and VMs in
  the wake of a towed body, and their exploitation for the purposes of wake
  detection. Numerical simulations initialized using an idealized late wake
  approximation showed that the vortex street generated by the wake was rea
 dily detected via potential enstrophy even amid a strong background IW fie
 ld. IWs radiated during buoyant collapse of the wake were also readily det
 ected among varying background conditions due to their highly coherent rad
 iation pattern. Wake evolution depended on both nondimensional and dimensi
 onful parameters associated with the wake; vortex evolution time scales va
 ried with Froude number, while wave detectability was primarily influenced
  by wake diameter modulating signal intensity. Overall, these results sugg
 est that, when carefully considered, both IW and VM signatures of submerge
 d wakes can be readily detected under a wide range of conditions even amid
  the “noisy” background internal wave field of the ocean. Join Meeting
 https://umassd.zoom.us/j/95380787170Note: Meeting ID and passcode required
 - email contact to obtain. For additional information, please contact Call
 ie Rumbut at c.rumbut@umassd.edu\nEvent page: /event
 s/cms/deos-phd-dissertation-defense-waves-and-vortices-in-the-ocean---from
 -theory-to-practice-by-bailey-remy.php\nEvent link: https://umassd.zoom.us
 /j/95380787170
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</script><p>Department of Estuarine and Oce
 an Sciences</p>\n<p>PhD Dissertation Defense</p>\n<p>"Waves and Vortices i
 n the Ocean - From Theory to Practice"<br />By: Bailey Remy</p>\n<p>Adviso
 r:<br />Dr. Miles Sundermeyer (UMass Dartmouth)</p>\n<p>Committee Members:
 <br />Dr. Geoffrey Cowles (UMass Dartmouth)\, Dr. Banafsheh Seyed-Aghazade
 h (UMass Dartmouth)\, and Dr. Marie-Pascale Lelong (NorthWest Research Ass
 ociates)</p>\n<p>Monday May 18\, 2026<br />11:00 AM<br />SMAST East 101-10
 3<br />836 S. Rodney French Blvd\, New Bedford<br />and via Zoom</p>\n<p>A
 bstract:</p>\n<p>Internal waves (IWs) are ubiquitous in the ocean and cont
 ribute significantly to the global ocean energy balance by cascading tidal
  and wind-driven energy to dissipative scales. Vortical motions (VMs)\, wh
 ich exist at scales similar to IWs\, carry potential vorticity (PV) and in
 fluence ocean circulation\, mixing\, and climate variability. Distinguishi
 ng these motions remains a fundamental challenge\, as nonlinear interactio
 ns in fully developed flows obscure their individual signatures. This diss
 ertation addresses two aspects of IWs and VMs in the ocean. Chapters 1 and
  2 investigated mechanisms of energy exchange between IWs and VMs\, and th
 e physical signatures and associated dynamics of reduced stratification re
 gions in the ocean. Chapter 3 examined the use of IW and VM signatures to 
 detect underwater wakes in realistic ocean environments.</p>\n<p>��</p>\n<
 p>Chapter 1 examined energy exchange between IWs and VMs in the ocean\, fo
 cusing on the contrasting roles of linear and nonlinear flow components in
  shaping available potential vorticity (APV) fields. In numerical simulati
 ons initialized with a Garrett-Munk IW spectrum\, energy was rapidly proje
 cted onto the linear VM basis by nonlinear triad interactions. Idealized s
 imulations of a single linear IW\, a balanced vortex\, and an adjusting de
 nsity anomaly exposed limitations of the linear flow decomposition: Lagran
 gian particle tracking revealed that linear APV differed from total APV du
 e to nonlinear vortex stretching terms\, causing the linear decomposition 
 to overestimate the PV-carrying component of flow. These results suggest t
 hat apparent rapid VM generation can sometimes reflect nonlinear artifacts
  rather than true PV modification.</p>\n<p>Chapter 2 examined the prevalen
 ce and nature of reduced stratification regions in the ocean relative to I
 W and VM dynamics. Occupying between ~5% and 25% of the model domain\, suc
 h regions exhibited distinct morphological and dynamical signatures consis
 tent with linear theory. Regions of reduced stratification that projected 
 onto linear VMs exhibited aspect ratios exceeding the canonical N0/f��scal
 ing\, and horizontal scales exceeding the local Rossby deformation radius.
  Regions that projected onto linear IWs more closely follow theoretical wa
 ve scaling and propagation characteristics. Lagrangian particle tracking a
 nd spectral shear-to-strain ratios further distinguished propagating wave 
 motions from materially conserved vortical motions. Additionally\, the gen
 eration of VM stratification anomalies was found to be energetically more 
 consistent with prolonged mixing events (time scales longer than a buoyanc
 y period) than intense short-term mixing events. These findings confirm th
 at reduced stratification regions in the ocean can result from both intern
 al wave straining and persistent vortical motions\, and that certain inter
 actions between them are consistent with current dynamical understanding o
 f both phenomena.</p>\n<p>Building on increased understanding of the relat
 ionship between IWs and VMs in the ocean\, Chapter 3 explored the generati
 on and evolution of IWs and VMs in the wake of a towed body\, and their ex
 ploitation for the purposes of wake detection. Numerical simulations initi
 alized using an idealized late wake approximation showed that the vortex s
 treet generated by the wake was readily detected via potential enstrophy e
 ven amid a strong background IW field. IWs radiated during buoyant collaps
 e of the wake were also readily detected among varying background conditio
 ns due to their highly coherent radiation pattern. Wake evolution depended
  on both nondimensional and dimensionful parameters associated with the wa
 ke\; vortex evolution time scales varied with Froude number\, while wave d
 etectability was primarily influenced by wake diameter modulating signal i
 ntensity. Overall\, these results suggest that\, when carefully considered
 \, both IW and VM signatures of submerged wakes can be readily detected un
 der a wide range of conditions even amid the “noisy” background intern
 al wave field of the ocean.</p>\n<p>Join Meeting<br /><br />N
 ote: Meeting ID and passcode required- email contact to obtain.</p>\n<p>Fo
 r additional information\, please contact Callie Rumbut at <a href="mailto
 :c.rumbut@umassd.edu">c.rumbut@umassd.edu</a></p><p>Event page: <a href="h
 ttps://www.umassd.edu/events/cms/deos-phd-dissertation-defense-waves-and-v
 ortices-in-the-ocean---from-theory-to-practice-by-bailey-remy.php">https:/
 /www.umassd.edu/events/cms/deos-phd-dissertation-defense-waves-and-vortice
 s-in-the-ocean---from-theory-to-practice-by-bailey-remy.php</a><br>Event l
 ink: </p></body></html>
DTSTAMP:20260428T191729
DTSTART;TZID=America/New_York:20260518T110000
DTEND;TZID=America/New_York:20260518T120000
LOCATION:SMAST East 101-103
SUMMARY;LANGUAGE=en-us:DEOS PhD Dissertation Defense: "Waves and Vortices i
 n the Ocean - From Theory to Practice" by Bailey Remy
UID:5e10518f064f8a7dd2e151e4ab0b4929@www.umassd.edu
END:VEVENT
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