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An Experimental Study of Turbidity Current Deposition, Character, and Diversion in Obstructed Subaqueous Channels
An Experimental Study of Turbidity Current Deposition, Character, and Diversion in Obstructed Subaqueous Channels
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091528.5
- ISBN
- 9798270231255
- DDC
- 551.3
- 서명/저자
- An Experimental Study of Turbidity Current Deposition, Character, and Diversion in Obstructed Subaqueous Channels / Dallas Brogdon Dunlap
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (176 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Meckel, Timothy Ashworth Committee members: Covault, Jacob A.; Buttles, James; Covault, Jacob; Mohrig, David.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Recent availability of high-resolution, laterally extensive 3D seismic reflection data in the Taranaki Basin has revealed deep-water submarine channels with unusually high-angle meander bends developed above channelized Miocene-age debris-flow deposits. We interpret this system as a vertically stacked channel complex, where an upper channel system composed of at least eleven elements overtops and diverts around large, rafted blocks embedded within a heterogeneous submarine mass-transport deposit (MTD). These block-flow interactions force turbidity currents toward the channel margins, where they promote lateral migration, enhanced erosion, and channel expansion. In contrast, directly over the MTD, the channel elements remain linearly confined with minimal migration or avulsion.To investigate how turbidity currents respond to such in-channel obstructions, we conducted scaled flume experiments using obstacles of similar shape but varying height, width, and orientation (90° and 60° angles of attack). The obstructions were placed within a straight 2 m-long, 0.65 m-wide, and 0.6 m-deep channel submerged in an 8 × 4 × 2 m tank. Saline and sediment-laden turbidity currents were released into the channel, with flow behavior captured using 3D velocity fields and high-resolution topographic scans to track depositional patterns and sediment flux. In all experiments, a pair of counter-rotating eddies formed upslope of the obstruction, positioned between the thalweg and channel margins. These eddies confined the high-velocity core, reduced sedimentation, and enhanced reworking within the thalweg. The eddies also redirected basal flow upward and outward toward the channel walls, while upper flows overtopped the obstruction. At 90°, a large (channel-filling) obstruction diverted flow out of the channel, whereas a smaller (85% width) obstruction allowed overtopping. At 60°, partial flow re-routing occurred for both cases, with sediment bypass nearly four times greater for the larger obstruction.These results demonstrate how obstruction height, orientation, and eddy formation influence turbidity current confinement, sediment bypass, and resulting channel morphology.
- 언어주기
- English
- 일반주제명
- Petroleum geology
- 일반주제명
- Geophysics
- 일반주제명
- Geology
- 키워드
- High-resolution
- 기타저자
- The University of Texas at Austin Earth and Planetary Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260311s2025 us eng d■001000017361179
■00520260311091528.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270231255
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a551.3
■1001 ▼aDunlap, Dallas Brogdon▼eauthor.
■24513▼aAn Experimental Study of Turbidity Current Deposition, Character, and Diversion in Obstructed Subaqueous Channels ▼cDallas Brogdon Dunlap
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (176 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Meckel, Timothy Ashworth Committee members: Covault, Jacob A.; Buttles, James; Covault, Jacob; Mohrig, David.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aRecent availability of high-resolution, laterally extensive 3D seismic reflection data in the Taranaki Basin has revealed deep-water submarine channels with unusually high-angle meander bends developed above channelized Miocene-age debris-flow deposits. We interpret this system as a vertically stacked channel complex, where an upper channel system composed of at least eleven elements overtops and diverts around large, rafted blocks embedded within a heterogeneous submarine mass-transport deposit (MTD). These block-flow interactions force turbidity currents toward the channel margins, where they promote lateral migration, enhanced erosion, and channel expansion. In contrast, directly over the MTD, the channel elements remain linearly confined with minimal migration or avulsion.To investigate how turbidity currents respond to such in-channel obstructions, we conducted scaled flume experiments using obstacles of similar shape but varying height, width, and orientation (90° and 60° angles of attack). The obstructions were placed within a straight 2 m-long, 0.65 m-wide, and 0.6 m-deep channel submerged in an 8 × 4 × 2 m tank. Saline and sediment-laden turbidity currents were released into the channel, with flow behavior captured using 3D velocity fields and high-resolution topographic scans to track depositional patterns and sediment flux. In all experiments, a pair of counter-rotating eddies formed upslope of the obstruction, positioned between the thalweg and channel margins. These eddies confined the high-velocity core, reduced sedimentation, and enhanced reworking within the thalweg. The eddies also redirected basal flow upward and outward toward the channel walls, while upper flows overtopped the obstruction. At 90°, a large (channel-filling) obstruction diverted flow out of the channel, whereas a smaller (85% width) obstruction allowed overtopping. At 60°, partial flow re-routing occurred for both cases, with sediment bypass nearly four times greater for the larger obstruction.These results demonstrate how obstruction height, orientation, and eddy formation influence turbidity current confinement, sediment bypass, and resulting channel morphology.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aPetroleum geology
■650 4▼aGeophysics
■650 4▼aGeology
■653 ▼aTurbidity Currents
■653 ▼aHigh-resolution
■653 ▼aMass-transport deposit
■653 ▼aLandslide topography
■7102 ▼aThe University of Texas at Austin▼bEarth and Planetary Sciences.▼edegree granting institution.
■7201 ▼aMeckel, Timothy Ashworth▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361179▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
