Modelling the influence of beach building pole heights on aeolian morphology and downwind sediment transport

P. Pourteimouri*, G.H.P. Campmans, K.M. Wijnberg, S.J.M.H. Hulscher

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
42 Downloads (Pure)

Abstract

Buildings on beaches either sit directly on the sediment surface or are placed on poles. These structures alter near-bed airflow around them. To quantify the influence of pole height on airflow, resulting bed morphology
around these buildings and sediment fluxes passing these buildings towards the dunes, three-dimensional simulations were performed. To compute airflow, we used the open-source computational fluid dynamics software
OpenFOAM. For sand transport and bed level changes, we used the Exner equation combined with Bagnold's sediment transport flux formulation, and a newly-developed model that couples the airflow model with the
sediment transport model AeoLiS. In the simulations, we modelled a row of ten full-scale beach buildings on a flat/smooth sandy bed, with a constant gap size between neighbouring buildings, varying the pole heights between simulations. Our findings showed that elevated buildings affect the wind speed in a larger region, both upwind and downwind, compared to buildings without poles. The model simulations showed that airflow
accelerated both underneath the elevated buildings and through the gaps between the buildings. Moreover, besides flow acceleration underneath the buildings, the elevated buildings induced slightly higher flow acceleration through the gaps between buildings. Depending on pole height to building width ratio, elevated buildings could both decrease and increase the downwind sediment flux compared to an undisturbed situation. For ratios
between 0 and 0.5, downwind fluxes were reduced in a zone between 5 and 40 m behind the buildings, while for ratios above 1.3, downwind fluxes were observed to increase in a zone up to 20 m behind the buildings. Also, this
study emphasizes the importance of selecting an optimal pole height to maximize the benefits of beach buildings in terms of passing on sediment transport towards the dunes.
Original languageEnglish
Article number108791
Number of pages15
JournalGeomorphology
Volume436
Early online date9 Jun 2023
DOIs
Publication statusPublished - 1 Sept 2023

Keywords

  • Airflow around buildings
  • Aeolian sediment transport
  • Beach buildings with poles
  • Erosion and deposition patterns
  • Duneward sediment transport
  • UT-Hybrid-D

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