Microscale Morphologic Changes Caused by Groundwater Seepage on a Macrotidal Beach.
Saved in:
| Title: | Microscale Morphologic Changes Caused by Groundwater Seepage on a Macrotidal Beach. |
|---|---|
| Authors: | Bae, Jinsu1 (AUTHOR), Sherman, Douglas J.1 (AUTHOR) sherman@ua.edu |
| Source: | Journal of Coastal Research. 2025, Vol. 41 Issue 1, p16-26. 11p. |
| Subjects: | Water table, Potential flow, Sediment transport, Beach erosion, Intertidal zonation, Darcy's law |
| Abstract: | Bae, J. and Sherman, D.J., 2025. Microscale morphologic changes caused by groundwater seepage on a macrotidal beach. Journal of Coastal Research, 41(1), 16–26. Charlotte (North Carolina), ISSN 0749-0208. Beach groundwater dynamics and groundwater seepage (exfiltration) are important agents of morphologic change in the intertidal zone and are controlled mainly by the relationships between local water level, the elevation of beach water table, and the permeability of beach sediments. Groundwater seepage can alter sediment transport processes on beaches through regulating saturation on the beach face and generating shear stresses sufficient to initiate sediment transport. This study investigates seepage dynamics in the context of a macrotidal beach and consequent erosion, deposition, and seepage-induced morphologic changes. Data were collected from the west coast of South Korea, at Hakampo Beach, where the spring, mean, and neap tide ranges are 6.5, 4.6, and 2.8 m, respectively. Beach morphology and changes were measured using terrestrial LiDAR. Beach groundwater levels were measured with a series of wells. Sand samples were taken and analyzed to characterize beach face texture and to estimate beach permeability. The water table and sediment data were used to estimate seepage flows at low water, using Darcy's law. The relationship between seepage rates and morphologic changes was examined with geographically weighted regression analysis. The results show that seepage-induced offshore transport occurred in the intertidal zone below groundwater seepage lines during spring tide, whereas transport was concentrated along seepage-induced tidal rills during neap tide. This highlights the importance of recognizing the variability in seepage discharge with different tidal ranges, especially in the context of potential flow rates exceeding the threshold for sediment transport. This study also points to the control of breaks in beach face slope and concomitant changes in grain size in the location of the groundwater seepage line in macrotidal environments. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Coastal Research is the property of KnowledgeWorks Global, Ltd 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 |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 182079744 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Microscale Morphologic Changes Caused by Groundwater Seepage on a Macrotidal Beach. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bae%2C+Jinsu%22">Bae, Jinsu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sherman%2C+Douglas+J%2E%22">Sherman, Douglas J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sherman@ua.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Coastal+Research%22">Journal of Coastal Research</searchLink>. 2025, Vol. 41 Issue 1, p16-26. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Water+table%22">Water table</searchLink><br /><searchLink fieldCode="DE" term="%22Potential+flow%22">Potential flow</searchLink><br /><searchLink fieldCode="DE" term="%22Sediment+transport%22">Sediment transport</searchLink><br /><searchLink fieldCode="DE" term="%22Beach+erosion%22">Beach erosion</searchLink><br /><searchLink fieldCode="DE" term="%22Intertidal+zonation%22">Intertidal zonation</searchLink><br /><searchLink fieldCode="DE" term="%22Darcy's+law%22">Darcy's law</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Bae, J. and Sherman, D.J., 2025. Microscale morphologic changes caused by groundwater seepage on a macrotidal beach. Journal of Coastal Research, 41(1), 16–26. Charlotte (North Carolina), ISSN 0749-0208. Beach groundwater dynamics and groundwater seepage (exfiltration) are important agents of morphologic change in the intertidal zone and are controlled mainly by the relationships between local water level, the elevation of beach water table, and the permeability of beach sediments. Groundwater seepage can alter sediment transport processes on beaches through regulating saturation on the beach face and generating shear stresses sufficient to initiate sediment transport. This study investigates seepage dynamics in the context of a macrotidal beach and consequent erosion, deposition, and seepage-induced morphologic changes. Data were collected from the west coast of South Korea, at Hakampo Beach, where the spring, mean, and neap tide ranges are 6.5, 4.6, and 2.8 m, respectively. Beach morphology and changes were measured using terrestrial LiDAR. Beach groundwater levels were measured with a series of wells. Sand samples were taken and analyzed to characterize beach face texture and to estimate beach permeability. The water table and sediment data were used to estimate seepage flows at low water, using Darcy's law. The relationship between seepage rates and morphologic changes was examined with geographically weighted regression analysis. The results show that seepage-induced offshore transport occurred in the intertidal zone below groundwater seepage lines during spring tide, whereas transport was concentrated along seepage-induced tidal rills during neap tide. This highlights the importance of recognizing the variability in seepage discharge with different tidal ranges, especially in the context of potential flow rates exceeding the threshold for sediment transport. This study also points to the control of breaks in beach face slope and concomitant changes in grain size in the location of the groundwater seepage line in macrotidal environments. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Coastal Research is the property of KnowledgeWorks Global, Ltd 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.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=182079744 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2112/JCOASTRES-D-24-00024.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 16 Subjects: – SubjectFull: Water table Type: general – SubjectFull: Potential flow Type: general – SubjectFull: Sediment transport Type: general – SubjectFull: Beach erosion Type: general – SubjectFull: Intertidal zonation Type: general – SubjectFull: Darcy's law Type: general Titles: – TitleFull: Microscale Morphologic Changes Caused by Groundwater Seepage on a Macrotidal Beach. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bae, Jinsu – PersonEntity: Name: NameFull: Sherman, Douglas J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 07490208 Numbering: – Type: volume Value: 41 – Type: issue Value: 1 Titles: – TitleFull: Journal of Coastal Research Type: main |
| ResultId | 1 |
