%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Almeida, L. P.
%A Almar, Rafaël
%A Blenkinsopp, C.
%A Senechal, N.
%A Bergsma, E.
%A Floc'h, F.
%A Caulet, C.
%A Biausque, M.
%A Marchesiello, Patrick
%A Grandjean, P.
%A Ammann, J.
%A Benshila, R.
%A Thuan, D. H.
%A da Silva, P. G.
%A Viet, N. T.
%T Lidar observations of the swash zone of a low-tide terraced tropical beach under variable wave conditions : the Nha Trang (Vietnam) COASTVAR experiment
%D 2020
%L fdi:010078203
%G ENG
%J Journal of Marine Science and Engineering
%K swash zone ; low-tide-terrace ; Lidar ; tide ; Nha Trang-Vietnam
%K VIET NAM ; NHA TRANG
%M ISI:000539274600003
%N 5
%P art. 302 [ ]
%R 10.3390/jmse8050302
%U https://www.documentation.ird.fr/hor/fdi:010078203
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-07/010078203.pdf
%V 8
%W Horizon (IRD)
%X 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, H-s = 0.9 m to 1.3 m; peak wave period, T-p = 8 to 12 s) concomitant with spring tides at the beginning of the period, followed by mild wind waves (offshore H-s under 0.5 m and T-p 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.
%$ 064 ; 032 ; 126