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Abstract
A field experiment was conducted at a tropical microtidal intermediate sandy beach with a low tide terrace (Nha Trang, Vietnam) to investigate the short-term swash-zone hydrodynamics and morphodynamics under variable wave conditions. Continuous 2D Lidar scanner observations of wave height at the lower foreshore, subsequent run-up and swash-induced topographic changes were obtained. These data were complemented by detailed real-time kinematic GPS topographic surveys. Variable wave and tide conditions were experienced during the field experiment with relatively large swell waves (offshore significant wave height, Hs = 0.9 m to 1.3 m; peak wave period, Tp = 8 to 12 s) concomitant with spring tides at the beginning of the period, followed by mild wind waves (offshore Hs under 0.5 m and Tp 5 s) and neap tides. This resulted in the following morphological sequence: berm erosion followed by rapid neap berm reformation and beach recovery within a few days. New insights into the link between intra-tidal swash dynamics and daily beach profile evolution were found using the Lidar dataset. While waves directly cause morphology changes on a wave-by-wave basis, tidal levels were found to be a key factor in determining the morphological wave-effect (accretive or erosive) due to modulated interaction between surf and swash hydro-morphodynamics.
Original language | English |
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Article number | 302 |
Journal | Journal of Marine Science and Engineering |
Volume | 8 |
Issue number | 5 |
Early online date | 26 Apr 2020 |
DOIs | |
Publication status | Published - 1 May 2020 |
Funding
This research was funded by Agence Nationale de la Recherch? (ANR, France), grant number ANR-14-ASTR-0019 and the APC was funded by first author voucher. This work received financial support from Vietnamese (MOST2/216/QD/BKHCN-No2994) and French grant through the COASTVAR project (ANR-14-ASTR-0019). D.H. T PhD was funded by the ARTS-IRD program. The authors of this work would like to thank the support provided by all the participants present in this field experiment. The authors would like to thank the valuable contribution from the two reviewers that provided very useful suggestions to improve this manuscript.
Keywords
- Lidar
- Low-tide-terrace
- Nha Trang-Vietnam
- Swash zone
- Tide
ASJC Scopus subject areas
- Civil and Structural Engineering
- Water Science and Technology
- Ocean Engineering
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- 1 Finished
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Waves in Shallow Water
Blenkinsopp, C. (PI)
Engineering and Physical Sciences Research Council
15/02/16 → 8/10/17
Project: Research council