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Dynamics of surface moisture content on a macro-tidal beach

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Abstract
Surface moisture content is a significant factor controlling aeolian sand transport. It is influenced by atmospheric, marine and sub-surface processes. Although several studies reported direct links in surface moisture content with the processes responsible for those variations, there is still a lack of understanding of its dynamic on a macro-tidal beach. This study aims to investigate spatial and temporal dynamics in the surface moisture content of a macro-tidal beach, and to determine the relative importance of factors controlling these. A field experiment was performed on a dissipative and non-barred beach at Mariakerke (Belgium) during an aeolian sand transport event in March 2017. Surface moisture content was measured from the backshore to the tidal zone using a video monitoring system. Simultaneous measurements of grain size, volumetric moisture content, groundwater level, atmospheric conditions, wind parameters, water level and topography were carried out. The hourly generated moisture maps indicate a clear cross-shore gradient of decreasing surface moisture content from the intertidal zone (ranging from 4-18%) to the backshore (none-8%), while it is more complex in the alongshore dimension. The backshore experienced the most rapid reduction of moisture content below 4% with a dryness rate of the surficial zone reaching 29% per hour in the late morning. It progressively continued to dry in the afternoon when sand strips, mobile aeolian bedforms, were well developed. Changes in moisture content over the beach surface reflect the atmospheric (solar radiation and wind) and marine (tidal elevation, wave and groundwater level) conditions and internal beach characteristics such as bedforms produced by aeolian sand transport and topography. Thus the continuous combinations of direct and indirect interactions between all these factors contribute to the spatial and temporal dynamics of surface moisture content. A better knowledge of the dynamics of the surface moisture content is a necessary prerequisite for the development of models and to compute budgets of aeolian sand transport.
Keywords
COASTAL DUNES, WATER-TABLE, SEDIMENT, Argus video system, aeolian sand transport, sediment size, beach hydrology, Belgian coast

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MLA
Montreuil, Anne-Lise, et al. “Dynamics of Surface Moisture Content on a Macro-Tidal Beach.” JOURNAL OF COASTAL RESEARCH, no. sp. iss. 85, 2018, pp. 206–10, doi:10.2112/SI85-042.1.
APA
Montreuil, A.-L., Chen, M., Brand, E., Strypsteen, G., Rauwoens, P., Vandenbulcke, A., … Verwaest, T. (2018). Dynamics of surface moisture content on a macro-tidal beach. JOURNAL OF COASTAL RESEARCH, (sp. iss. 85), 206–210. https://doi.org/10.2112/SI85-042.1
Chicago author-date
Montreuil, Anne-Lise, Margaret Chen, Evelien Brand, Glenn Strypsteen, Pieter Rauwoens, Annelies Vandenbulcke, Alain De Wulf, Sebastian Dan, and Toon Verwaest. 2018. “Dynamics of Surface Moisture Content on a Macro-Tidal Beach.” JOURNAL OF COASTAL RESEARCH, no. sp. iss. 85: 206–10. https://doi.org/10.2112/SI85-042.1.
Chicago author-date (all authors)
Montreuil, Anne-Lise, Margaret Chen, Evelien Brand, Glenn Strypsteen, Pieter Rauwoens, Annelies Vandenbulcke, Alain De Wulf, Sebastian Dan, and Toon Verwaest. 2018. “Dynamics of Surface Moisture Content on a Macro-Tidal Beach.” JOURNAL OF COASTAL RESEARCH (sp. iss. 85): 206–210. doi:10.2112/SI85-042.1.
Vancouver
1.
Montreuil A-L, Chen M, Brand E, Strypsteen G, Rauwoens P, Vandenbulcke A, et al. Dynamics of surface moisture content on a macro-tidal beach. JOURNAL OF COASTAL RESEARCH. 2018;(sp. iss. 85):206–10.
IEEE
[1]
A.-L. Montreuil et al., “Dynamics of surface moisture content on a macro-tidal beach,” JOURNAL OF COASTAL RESEARCH, no. sp. iss. 85, pp. 206–210, 2018.
@article{8572990,
  abstract     = {{Surface moisture content is a significant factor controlling aeolian sand transport. It is influenced by atmospheric, marine and sub-surface processes. Although several studies reported direct links in surface moisture content with the processes responsible for those variations, there is still a lack of understanding of its dynamic on a macro-tidal beach. This study aims to investigate spatial and temporal dynamics in the surface moisture content of a macro-tidal beach, and to determine the relative importance of factors controlling these. A field experiment was performed on a dissipative and non-barred beach at Mariakerke (Belgium) during an aeolian sand transport event in March 2017. Surface moisture content was measured from the backshore to the tidal zone using a video monitoring system. Simultaneous measurements of grain size, volumetric moisture content, groundwater level, atmospheric conditions, wind parameters, water level and topography were carried out. The hourly generated moisture maps indicate a clear cross-shore gradient of decreasing surface moisture content from the intertidal zone (ranging from 4-18%) to the backshore (none-8%), while it is more complex in the alongshore dimension. The backshore experienced the most rapid reduction of moisture content below 4% with a dryness rate of the surficial zone reaching 29% per hour in the late morning. It progressively continued to dry in the afternoon when sand strips, mobile aeolian bedforms, were well developed. Changes in moisture content over the beach surface reflect the atmospheric (solar radiation and wind) and marine (tidal elevation, wave and groundwater level) conditions and internal beach characteristics such as bedforms produced by aeolian sand transport and topography. Thus the continuous combinations of direct and indirect interactions between all these factors contribute to the spatial and temporal dynamics of surface moisture content. A better knowledge of the dynamics of the surface moisture content is a necessary prerequisite for the development of models and to compute budgets of aeolian sand transport.}},
  author       = {{Montreuil, Anne-Lise and Chen, Margaret and Brand, Evelien and Strypsteen, Glenn and Rauwoens, Pieter and Vandenbulcke, Annelies and De Wulf, Alain and Dan, Sebastian and Verwaest, Toon}},
  issn         = {{0749-0208}},
  journal      = {{JOURNAL OF COASTAL RESEARCH}},
  keywords     = {{COASTAL DUNES,WATER-TABLE,SEDIMENT,Argus video system,aeolian sand transport,sediment size,beach hydrology,Belgian coast}},
  language     = {{eng}},
  location     = {{Busan, South Korea}},
  number       = {{sp. iss. 85}},
  pages        = {{206--210}},
  title        = {{Dynamics of surface moisture content on a macro-tidal beach}},
  url          = {{http://dx.doi.org/10.2112/SI85-042.1}},
  year         = {{2018}},
}

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