Laboratory investigation of the Bruun Rule and beach response to sea level rise

Atkinson, Alexander; Baldock, Tom E.; Birrien, Florent; Callaghan, David P.; Nielsen, Peter; Beuzen, Tomas; Turner, Ian L.; Blenkinsopp, Chris; Ranasinghe, Roshanka

doi:10.1016/j.coastaleng.2018.03.003

Cited by 66 publications

(51 citation statements)

References 29 publications

(19 reference statements)

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“…The same wave conditions were used for pairs of non-nourished-nourished beaches, commencing from plane and power-law beach profiles. Bathymetry was measured at high spatial and temporal resolution using a combined sub-aerial and sub-aqueous laser profiler that provides 8 simultaneous profiles across the width of the flume (Atkinson and Baldock, 2018. All tests were run to near-equilibrium conditions, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…no significant change in bathymetry or shoreline position. Further general information is given in Atkinson et al (2018). After formation of an equilibrium profile at the initial water level (z = 0), the beach was nourished with one of three different placement strategies (figure 1), the water level was raised (by approximately Hm0/2) and the same waves were repeated, again until the profile stabilised.…”

Section: Methodsmentioning

confidence: 99%

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Physical Modelling of the Response of Non-Nourished and Nourished Beach Profiles to Storm Surge or Sea Level Rise

Atkinson¹,

Baldock²

2018

Int. Conf. Coastal. Eng.

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Beach nourishment is a key strategy used to mitigate against the effects beach erosion under storm surge or sea level rise (SLR). Comparisons of different strategies are very difficult under field conditions. This paper presents the results of medium scale experiments that investigate the response of non-nourished and nourished beach profiles to water level rise, using three different nourishment strategies. The shoreline recession and profile response are compared to predictions from the Bruun rule (Bruun, 1962), recent modifications (Rosati et al., 2013) and a profile translation model that conserves the shape of the initial profile and the sediment volume.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Physical Modelling of the Response of Non-Nourished and Nourished Beach Profiles to Storm Surge or Sea Level Rise

Atkinson¹,

Baldock²

2018

Int. Conf. Coastal. Eng.

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“…Until recently (Atkinson et al, 2018;Beuzen et al, 2018), few published laboratory-based experiments had detailed sufficiently long duration experiments to investigate beach profile responses toward equilibrium at varying water levels. The paper by Atkinson et al (2018) constitutes some of the research presented here (Chapter 4 in particular), although some additional experiments are included which could not fit into that paper or were incomplete at the time of submission. Before these experiments were conducted there had only been one laboratory study, in which the Bruun Rule was partially assessed using bar-forming monochromatic waves in extremely small-scale conditions (Schwartz, 1967).…”

Section: Practical Considerations For Assessing the Bruun Rulementioning

confidence: 99%

Laboratory beach profile dynamics and responses to changing water levels with and without nourishment

Atkinson¹

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This thesis presents the results of reduced-scale, laboratory wave flume physical model experiments. Following Bruun's (1954 and 1962) original proposal, Sea Level Rise (SLR) is expected to lead to cross-shore losses of sand volume from beaches. While some field studies have documented some of the characteristics anticipated with profile response to SLR (i.e. loss of beach volume and shoreline erosion), until this research commenced, there had been no Firstly, thanks must go to each of my research advisors. Professor Tom Baldock for his advice, support and guidance throughout this process. Professor Peter Nielsen for his support and encouragement to investigate various aspects of beach dynamics that interested me. Dr David Callaghan for his guidance and support in helping me appreciate many aspects of numerical analyses. I have learnt so much in my time at UQ, and I feel very privileged to have had the opportunity to work closely with each of you. Thank you also to Dean Patterson, for your encouragement and regular feedback at the coastal research group meetings. Thank you to all other members of the UQ coastal research group, it has been a pleasure to know you all and learn about your respective areas of research. Thanks to Mr Jason van der Gevel and Mr Stewart Matthews for all their assistance in the hydraulics laboratory and maintaining the wave makers, ensuring smooth operation over the thousands of hours I logged on them. Thanks to Dr Van Thuan Nguyen for his assistance in developing and debugging the electronics and software for the laser profiling system. Thank you to Ms Sheng Wu, Ms Chase Bawden, Ms Laura Beckingham, Dr Tomoko Shimamoto and Dr Florent Birrien for their assistance in operating the wave flumes and collecting profile data. Special thanks must be afforded to my wife, Lizzy, for her love, understanding and unwavering support, without whom, I would not have undertaken this project. Elise, you arrived halfway through my candidature and have brightened every day since, providing an endless source of inspiration and most welcome play-breaks.

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“…Global seal-level rise is well known to lead to a recession of the shoreline (Bruun 1954, 1962, 1983, 1988, Rosati et al 2013, Shand et al 2013, Dean and Houston 2016, Le Cozannet et al 2016, Atkinson et al 2018. It is an important contributor to erosion hotspots at decadal to centenary scales (Zhang et al 2004, Nicholls and Cazenave 2010, Passeri et al 2014, Le Cozannet et al 2019.…”

Section: Introductionmentioning

confidence: 99%

Beach adaptation to intraseasonal sea level changes

Ondoa

Almar

Jouanno

et al. 2020

Environ. Res. Commun.

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Coastal areas such as beaches with steep upper slope and flat low-tide terrace, are expected to be increasingly affected by sea level changes. Related impacts due to the paramount rise in sea level have been intensively investigated, but there is still little evidence of the impact of shorter timescales variations on the coast, particularly those induced by trapped coastal waves. Using the latest advances in video bathymetric estimation, daily observations over 3.5 years (February 2013 to June 2016) on Grand Popo Beach (West Africa) reveal that intraseasonal sea level variations impact the beach profile. The intraseasonal sea level variations are dominated by the propagation of wind forced coastal trapped waves with periods ranging 15-95 days. It is shown that the beach goes through a transient state with a deformation of the profile: an intraseasonal sea level rise leads to a 2 m erosion of the upper beach and a widening of the flat terrace at the lower beach. Although the underlying mechanism must be tested through beach profile modelling, this study highlights the active adaptation of the beach profile to variations in sea level.

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Laboratory investigation of the Bruun Rule and beach response to sea level rise

Cited by 66 publications

References 29 publications

Physical Modelling of the Response of Non-Nourished and Nourished Beach Profiles to Storm Surge or Sea Level Rise

Physical Modelling of the Response of Non-Nourished and Nourished Beach Profiles to Storm Surge or Sea Level Rise

Laboratory beach profile dynamics and responses to changing water levels with and without nourishment

Beach adaptation to intraseasonal sea level changes

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