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Sedimentation processes and morphological changes in a dredge pit and surrounding environment on Ship Shoal in the northern Gulf of Mexico.

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Title: Sedimentation processes and morphological changes in a dredge pit and surrounding environment on Ship Shoal in the northern Gulf of Mexico.
Authors: Gartelman, Adam1,2 (AUTHOR) agarte2@lsu.edu, Xu, Kehui1,2 (AUTHOR), Maiti, Kanchan1,2 (AUTHOR), Liu, Haoran3 (AUTHOR), Moran, Kelli1,2 (AUTHOR), Wilson, Carol2,4 (AUTHOR), Roberts, Brian J.5 (AUTHOR), Nelson, James6 (AUTHOR)
Source: Marine Geology. Apr2024, Vol. 470, pN.PAG-N.PAG. 1p.
Subjects: Dredging spoil, Dredges, Sidescan sonar, Dredging, Barrier islands, Wind waves
Geographic Terms: Gulf of Mexico, Louisiana
Abstract: The use of dredged material from continental shelves and estuaries for degraded barrier islands has become a common practice worldwide. South Pelto block on eastern Ship Shoal (SS) off the coast of Louisiana has been dredged for high-quality sand resources, including Caminada Dredge Pit (CDP) and multiple pits in East Timbalier borrow areas (ET) adjacent to CDP. To understand how these dredge pits change and sediments infill over time, multiple surveys were conducted, including bathymetry, sidescan sonar, subbottom CHIRP, and sediment samples were collected for grain size analysis. Although there is no nearby muddy sediment, sidescan and grain size data both show low-reflectivity areas inside CDP became larger over time, indicating continual supply from suspended mud. Subbottom data show decreasing pit wall slopes over time and degassing over patchy low reflectivity areas on the pit bottom. Arc-chord rugosity analysis was performed with emphasis applied to ET to examine the difference between cutter and hopper dredge techniques. It was revealed that dredging from the hopper created a higher rugosity value than the cutter, leading to a shorter recovery time for the benthic environment. Bathymetric results reveal approximately 20 m to 60 m of horizontal outward pit wall migrations over 3–5 years. Hurricanes Marco, Zeta, and Ida as well as Tropical Storm Claudette passed the study site (within 50 Km) during the study period which increased wind-wave energies sufficiently to develop new sand ripples discovered on sidescan sonar data near ET and CDP. By integrating various datasets and investigating the effects of tropical cyclones on a dredged area in SS, this study contributes valuable insights that fill existing knowledge gaps and enhance decision-making for future management strategies. • CHIRP shows pit wall migration significantly less than buffer federally required. • Analysis shows hopper dredge increases overall rugosity compared to cutter dredge. • Tropical cyclones increased energies such that sand ripples formed on Ship Shoal. [ABSTRACT FROM AUTHOR]
Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 176295823
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Sedimentation processes and morphological changes in a dredge pit and surrounding environment on Ship Shoal in the northern Gulf of Mexico.
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  Data: <searchLink fieldCode="AR" term="%22Gartelman%2C+Adam%22">Gartelman, Adam</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> agarte2@lsu.edu</i><br /><searchLink fieldCode="AR" term="%22Xu%2C+Kehui%22">Xu, Kehui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maiti%2C+Kanchan%22">Maiti, Kanchan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Haoran%22">Liu, Haoran</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moran%2C+Kelli%22">Moran, Kelli</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wilson%2C+Carol%22">Wilson, Carol</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Roberts%2C+Brian+J%2E%22">Roberts, Brian J.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nelson%2C+James%22">Nelson, James</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Marine+Geology%22">Marine Geology</searchLink>. Apr2024, Vol. 470, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Dredging+spoil%22">Dredging spoil</searchLink><br /><searchLink fieldCode="DE" term="%22Dredges%22">Dredges</searchLink><br /><searchLink fieldCode="DE" term="%22Sidescan+sonar%22">Sidescan sonar</searchLink><br /><searchLink fieldCode="DE" term="%22Dredging%22">Dredging</searchLink><br /><searchLink fieldCode="DE" term="%22Barrier+islands%22">Barrier islands</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+waves%22">Wind waves</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Gulf+of+Mexico%22">Gulf of Mexico</searchLink><br /><searchLink fieldCode="DE" term="%22Louisiana%22">Louisiana</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The use of dredged material from continental shelves and estuaries for degraded barrier islands has become a common practice worldwide. South Pelto block on eastern Ship Shoal (SS) off the coast of Louisiana has been dredged for high-quality sand resources, including Caminada Dredge Pit (CDP) and multiple pits in East Timbalier borrow areas (ET) adjacent to CDP. To understand how these dredge pits change and sediments infill over time, multiple surveys were conducted, including bathymetry, sidescan sonar, subbottom CHIRP, and sediment samples were collected for grain size analysis. Although there is no nearby muddy sediment, sidescan and grain size data both show low-reflectivity areas inside CDP became larger over time, indicating continual supply from suspended mud. Subbottom data show decreasing pit wall slopes over time and degassing over patchy low reflectivity areas on the pit bottom. Arc-chord rugosity analysis was performed with emphasis applied to ET to examine the difference between cutter and hopper dredge techniques. It was revealed that dredging from the hopper created a higher rugosity value than the cutter, leading to a shorter recovery time for the benthic environment. Bathymetric results reveal approximately 20 m to 60 m of horizontal outward pit wall migrations over 3–5 years. Hurricanes Marco, Zeta, and Ida as well as Tropical Storm Claudette passed the study site (within 50 Km) during the study period which increased wind-wave energies sufficiently to develop new sand ripples discovered on sidescan sonar data near ET and CDP. By integrating various datasets and investigating the effects of tropical cyclones on a dredged area in SS, this study contributes valuable insights that fill existing knowledge gaps and enhance decision-making for future management strategies. • CHIRP shows pit wall migration significantly less than buffer federally required. • Analysis shows hopper dredge increases overall rugosity compared to cutter dredge. • Tropical cyclones increased energies such that sand ripples formed on Ship Shoal. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.margeo.2024.107218
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Dredging spoil
        Type: general
      – SubjectFull: Dredges
        Type: general
      – SubjectFull: Sidescan sonar
        Type: general
      – SubjectFull: Dredging
        Type: general
      – SubjectFull: Barrier islands
        Type: general
      – SubjectFull: Wind waves
        Type: general
      – SubjectFull: Gulf of Mexico
        Type: general
      – SubjectFull: Louisiana
        Type: general
    Titles:
      – TitleFull: Sedimentation processes and morphological changes in a dredge pit and surrounding environment on Ship Shoal in the northern Gulf of Mexico.
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            NameFull: Xu, Kehui
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            NameFull: Maiti, Kanchan
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            NameFull: Liu, Haoran
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            – D: 01
              M: 04
              Text: Apr2024
              Type: published
              Y: 2024
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              Value: 470
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