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Silicic acid flux to the ocean from tidal permeable sediments: A modeling study

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Title: Silicic acid flux to the ocean from tidal permeable sediments: A modeling study
Authors: Chassagne, Romain Louis1 rchassagne@gmail.com, Lecroart, Pascal1, Beaugendre, Héloïse2, Capo, Sylvain1, Parisot, Jean-Paul1, Anschutz, Pierre1
Source: Computers & Geosciences. Jun2012, Vol. 43, p52-62. 11p.
Subjects: Silicic acid, Tides, Sediments, Geological modeling, Sand, Beaches, Algorithms, Soil permeability
Abstract: Abstract: Sandy sediments of tidal beaches are poor in reactive substances because they are regularly flushed by significant flow caused by tidal forcing. This transport process may significantly affect the flux of reactive solutes to the ocean. A two dimensional model coupling the Richards equation that describes the flow in permeable sediments and the conservation equation of the silicic acid was developed to simulate the evolution of the silicic acid concentration into a variably saturated porous media submitted to tidal forcing. A detailed algorithm of drainage zone under tidal forcing and numerical methods needed to solve it are properly presented. Flux to the ocean has been estimated. The silicic acid concentration displays a permanent lens with low silicic acid concentration at the top of the tidal zone. This lens that results from the tidal forcing, presents weak variations of area during the tidal cycle. Silicic outflux to the ocean increases with increasing beach slope, hydraulic conductivity and tidal range. Simulations reveal that the total silicic acid flux to the ocean from the coastal marine sands can be considered as significant compared to the flux supplied by the rivers. These results may alter the previously published global budget of the silicic acid to the ocean. [Copyright &y& Elsevier]
Copyright of Computers & Geosciences is the property of Pergamon Press - An Imprint of Elsevier Science 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: 75450687
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Silicic acid flux to the ocean from tidal permeable sediments: A modeling study
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  Data: <searchLink fieldCode="AR" term="%22Chassagne%2C+Romain+Louis%22">Chassagne, Romain Louis</searchLink><relatesTo>1</relatesTo><i> rchassagne@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Lecroart%2C+Pascal%22">Lecroart, Pascal</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Beaugendre%2C+Héloïse%22">Beaugendre, Héloïse</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Capo%2C+Sylvain%22">Capo, Sylvain</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Parisot%2C+Jean-Paul%22">Parisot, Jean-Paul</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Anschutz%2C+Pierre%22">Anschutz, Pierre</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Computers+%26+Geosciences%22">Computers & Geosciences</searchLink>. Jun2012, Vol. 43, p52-62. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Silicic+acid%22">Silicic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Tides%22">Tides</searchLink><br /><searchLink fieldCode="DE" term="%22Sediments%22">Sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+modeling%22">Geological modeling</searchLink><br /><searchLink fieldCode="DE" term="%22Sand%22">Sand</searchLink><br /><searchLink fieldCode="DE" term="%22Beaches%22">Beaches</searchLink><br /><searchLink fieldCode="DE" term="%22Algorithms%22">Algorithms</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+permeability%22">Soil permeability</searchLink>
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  Data: Abstract: Sandy sediments of tidal beaches are poor in reactive substances because they are regularly flushed by significant flow caused by tidal forcing. This transport process may significantly affect the flux of reactive solutes to the ocean. A two dimensional model coupling the Richards equation that describes the flow in permeable sediments and the conservation equation of the silicic acid was developed to simulate the evolution of the silicic acid concentration into a variably saturated porous media submitted to tidal forcing. A detailed algorithm of drainage zone under tidal forcing and numerical methods needed to solve it are properly presented. Flux to the ocean has been estimated. The silicic acid concentration displays a permanent lens with low silicic acid concentration at the top of the tidal zone. This lens that results from the tidal forcing, presents weak variations of area during the tidal cycle. Silicic outflux to the ocean increases with increasing beach slope, hydraulic conductivity and tidal range. Simulations reveal that the total silicic acid flux to the ocean from the coastal marine sands can be considered as significant compared to the flux supplied by the rivers. These results may alter the previously published global budget of the silicic acid to the ocean. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Computers & Geosciences is the property of Pergamon Press - An Imprint of Elsevier Science 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: 10.1016/j.cageo.2012.02.014
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 52
    Subjects:
      – SubjectFull: Silicic acid
        Type: general
      – SubjectFull: Tides
        Type: general
      – SubjectFull: Sediments
        Type: general
      – SubjectFull: Geological modeling
        Type: general
      – SubjectFull: Sand
        Type: general
      – SubjectFull: Beaches
        Type: general
      – SubjectFull: Algorithms
        Type: general
      – SubjectFull: Soil permeability
        Type: general
    Titles:
      – TitleFull: Silicic acid flux to the ocean from tidal permeable sediments: A modeling study
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            NameFull: Chassagne, Romain Louis
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            NameFull: Lecroart, Pascal
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            NameFull: Beaugendre, Héloïse
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            NameFull: Capo, Sylvain
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            NameFull: Parisot, Jean-Paul
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            – D: 01
              M: 06
              Text: Jun2012
              Type: published
              Y: 2012
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              Value: 00983004
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              Value: 43
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