Swash zone dynamics of a sandy beach with low tide terrace during variable wave and tide conditions

Almeida, Luís Pedro; Almar, Rafaël; Marchesiello, Patrick; Benshila, Rachid; Martins, Kévin; Blenkinsopp, Chris; Ammann, Jeromme; Grandjean, Philippe; Viet, Nguyen Trung; Thuan, Duong Hai; Binh, Le T.; Sénéchal, Nadia; Detandt, Guillaume; Biausque, Mélanie; Garlan, Thierry; Bergsma, Erwin W. J.; Caulet, Charles; Tran, Hai-Yen

doi:10.5150/jngcgc.2016.016

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The upper beach slope was 0.1 while the inter-tidal terrace has a slope of 0.01. The sediment sizes varies within Nha Trang bay from D 50 = 900 µm (coarse) in the North to 400 µm (medium-coarse) in the South [2]. During the experiments, almost no wind was present, but this was not measured.…”

Section: Study Site and Data Collectionmentioning

confidence: 99%

“…During the field campaign a range of instruments were deployed, an offshore Acoustic Doppler Current Profiler (ADCP), near-shore ADV (Acoustic Doppler Velocimeter), shore mounted video cameras, a swash pole camera, pressure transducers and a 2D LiDAR (for details see Almeida et al [2]). This paper will focus on data only from the 2D LiDAR which was deployed on a 4 m tall tower above the high tide limit as shown in Figure 2.…”

Section: Study Site and Data Collectionmentioning

confidence: 99%

See 1 more Smart Citation

Bore collapse and wave run-up on a sandy beach

Bergsma

Blenkinsopp

Martins

et al. 2019

Continental Shelf Research

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Section: Study Site and Data Collectionmentioning

confidence: 99%

Section: Study Site and Data Collectionmentioning

confidence: 99%

Bore collapse and wave run-up on a sandy beach

Bergsma

Blenkinsopp

Martins

et al. 2019

Continental Shelf Research

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“…The morphological response of the swash zone to varying offshore waves is highly modulated by the surf zone conditions, being the terrace width a key parameter of the wave energy dissipation rate. Continuing these resents results [7,[12][13][14][15], the present work intends to describe the swash and surf dynamics of LTT beaches by doing a simple characterisation of these zones using two main morphological parameters of LTT cross-shore beach profiles: the upper swash slope (β) and the terrace width (L t ) of the surf zone. These are key parameters that defines the shape of cross-shore LTT profiles and their relationship with the hydrodynamics wave forcing will provide information of their behaviour.…”

Section: Introductionmentioning

confidence: 82%

Surf and Swash Dynamics on Low Tide Terrace Beaches

Mingo

Almar

Lacaze

2021

Coasts

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Low tide terrace (LLT) beaches are characterised by a moderately steep beach face and a flat shallow terrace influencing the local hydro-morphodynamics during low tide. The upper beachface slope (β) and the terrace width (Lt) are the main morphological parameters that define the shape of LTT cross-shore beach profiles. This work aims at better understanding the behaviour of β and Lt and their link with the incoming wave forcing. For this purpose, our results are based on 3.5 years times series of daily beach profiles and wave conditions surveys at two different microtidal LTT beaches with similar sediments size but different wave climate, one at Nha Trang (Vietnam) and the other one at Grand Popo (Benin). While they look similar, two contrasting behaviour were linked to two sub-types of LTT regimes: the first one is surf regulated beaches (SRB) where the swash zone is highly regulated by the surf zone wave energy dissipation on the terrace, and the second is swash regulated beaches (SwRB) acting in more reflective regime where the terrace is not active and the energy dissipation is mainly produced in the swash zone, the terrace becomes a consequences of the high dynamics in the swash zone. Finally, extending the common view of an equilibrium beach profile as a power law of the cross-shore distance, the ability of a simple parametrized cubic function model with the Dean number as unique control parameters is proposed and discussed. This simple model can be used for the understanding of LLT environments but it can not be extended to the whole beach spectrum.

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Contributions to Coastal Flooding Events in Southeast of Vietnam and their link with Global Mean Sea Level Rise

et al. 2018

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This work analyzes the components of the total water level (TWL) that cause flooding in a tropical coastal area (Nha Trang beach, Southeast of Vietnam), and examines their link with global mean sea level rise (GMSLR). Interactions between the wave induced run-up (R) and astronomical tide (AT) were responsible for 43% of the 35 flooding events identified between 1993 and 2015. Most of these events (97%) took place during the winter monsoon season, when long-lasting extreme R and positive non-tidal residual (NTR) are likely to occur. Removal of the GMSLR trend from the NTR was found to affect the flood occurrence of 17% of these events, while the trend in wave height did not have any detectable impact. Our research highlights the direct connection between global climate changes and coastal flooding events.

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Swash zone dynamics of a sandy beach with low tide terrace during variable wave and tide conditions

Cited by 3 publications

References 7 publications

Bore collapse and wave run-up on a sandy beach

Bore collapse and wave run-up on a sandy beach

Surf and Swash Dynamics on Low Tide Terrace Beaches

Contributions to Coastal Flooding Events in Southeast of Vietnam and their link with Global Mean Sea Level Rise

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