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Experimental Investigation of the Hydrodynamic Behavior of a Flexible Line of Floating Modules to Contain Wood Logs Upstream of Hydroelectric Plants.

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Title: Experimental Investigation of the Hydrodynamic Behavior of a Flexible Line of Floating Modules to Contain Wood Logs Upstream of Hydroelectric Plants.
Authors: de Castro, F. S.1 (AUTHOR) fscastro@ipt.br, Dantas, J. L. D.2 (AUTHOR) joda@forcetechnology.com, Assi, G. R. S.3 (AUTHOR) g.assi@usp.br
Source: Journal of Hydraulic Engineering. Mar2025, Vol. 151 Issue 2, p1-13. 13p.
Subjects: Slash (Logging), Wood, Hydrodynamics, Sawlogs, Geometry
Abstract: The containment of wood logs and debris floating in the river upstream of Brazil's Santo Antônio hydroelectric plant is a major issue for the plant's operation. Log booms are floating structures assembled in the shape of a long chain to divert heavy wood logs from the machinery. The present study proposes a method to evaluate the overall hydrodynamic loads acting on a log-boom line based on experiments with scale modules in a towing tank and analytical models of the line. Experiments with a single module and a set of three log-boom modules were performed to determine the hydrodynamic drag, lift, and moment acting on the modules as a function of the yaw angle for low Froude numbers. These coefficients were employed in analytical models to calculate the shape of the line and the overall loads. The first model assumed a catenary-like geometry of the line, whereas the second assumed a parabolic geometry. The results were evaluated for two lines with five and seven log booms towed in the tank. A good agreement of load results was observed for the tested Froude number range, indicating that the method may be employed to design river floating barriers. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydraulic Engineering is the property of American Society of Civil Engineers 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: 182245647
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Experimental Investigation of the Hydrodynamic Behavior of a Flexible Line of Floating Modules to Contain Wood Logs Upstream of Hydroelectric Plants.
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  Data: <searchLink fieldCode="AR" term="%22de+Castro%2C+F%2E+S%2E%22">de Castro, F. S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fscastro@ipt.br</i><br /><searchLink fieldCode="AR" term="%22Dantas%2C+J%2E+L%2E+D%2E%22">Dantas, J. L. D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> joda@forcetechnology.com</i><br /><searchLink fieldCode="AR" term="%22Assi%2C+G%2E+R%2E+S%2E%22">Assi, G. R. S.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> g.assi@usp.br</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Hydraulic+Engineering%22">Journal of Hydraulic Engineering</searchLink>. Mar2025, Vol. 151 Issue 2, p1-13. 13p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Slash+%28Logging%29%22">Slash (Logging)</searchLink><br /><searchLink fieldCode="DE" term="%22Wood%22">Wood</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Sawlogs%22">Sawlogs</searchLink><br /><searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The containment of wood logs and debris floating in the river upstream of Brazil's Santo Antônio hydroelectric plant is a major issue for the plant's operation. Log booms are floating structures assembled in the shape of a long chain to divert heavy wood logs from the machinery. The present study proposes a method to evaluate the overall hydrodynamic loads acting on a log-boom line based on experiments with scale modules in a towing tank and analytical models of the line. Experiments with a single module and a set of three log-boom modules were performed to determine the hydrodynamic drag, lift, and moment acting on the modules as a function of the yaw angle for low Froude numbers. These coefficients were employed in analytical models to calculate the shape of the line and the overall loads. The first model assumed a catenary-like geometry of the line, whereas the second assumed a parabolic geometry. The results were evaluated for two lines with five and seven log booms towed in the tank. A good agreement of load results was observed for the tested Froude number range, indicating that the method may be employed to design river floating barriers. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Hydraulic Engineering is the property of American Society of Civil Engineers 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:
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    Identifiers:
      – Type: doi
        Value: 10.1061/JHEND8.HYENG-14113
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Slash (Logging)
        Type: general
      – SubjectFull: Wood
        Type: general
      – SubjectFull: Hydrodynamics
        Type: general
      – SubjectFull: Sawlogs
        Type: general
      – SubjectFull: Geometry
        Type: general
    Titles:
      – TitleFull: Experimental Investigation of the Hydrodynamic Behavior of a Flexible Line of Floating Modules to Contain Wood Logs Upstream of Hydroelectric Plants.
        Type: main
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            NameFull: de Castro, F. S.
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            NameFull: Dantas, J. L. D.
      – PersonEntity:
          Name:
            NameFull: Assi, G. R. S.
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          Dates:
            – D: 01
              M: 03
              Text: Mar2025
              Type: published
              Y: 2025
          Identifiers:
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              Value: 07339429
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              Value: 151
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              Value: 2
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            – TitleFull: Journal of Hydraulic Engineering
              Type: main
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