Hydrodynamics and morphological adjustment of a mixed sand and gravel beach, Torere, Bay of Plenty, New Zealand

Ivamy, Mark C.; Kench, Paul S.

doi:10.1016/j.margeo.2006.01.002

Cited by 57 publications

(39 citation statements)

References 33 publications

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“…During the last decade, results from studies of sediment dynamics on MSG beaches have been reported by Allan et al (2006), Ivamy and Kench (2006), Ciavola and Castiglione (2009), Curtiss et al (2009), Dickson et al (2011), Miller et al (2011, Bertoni et al (2012Bertoni et al ( , 2013, and Miller and Warrick (2012). Of these, only Ivamy and Kench (2006) and Curtiss et al (2009) deployed instruments in the intertidal zone -i.e.…”

Section: Introductionmentioning

confidence: 99%

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Sediment dynamics on a steep, megatidal, mixed sand–gravel–cobble beach

2014

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Abstract.Results are presented from a pilot study of shore-face sediment dynamics on a steep, poorly sorted, coarse-grained, megatidal beach at the head of the Bay of Fundy, Nova Scotia, Canada. The experiment involved the first field deployment of a prototype wideband, pulse-coherent, bistatic acoustic Doppler profiling system. Measurements of the vertical structure of flow and turbulence above a sloping bed, as well as bed material velocity, demonstrate the capabilities of this instrument vis-à-vis studies of nearshore sediment dynamics at the field scale. The second focus of the paper is the unexpected observation that the surficial sediment median diameter, across the lower two-thirds of the intertidal zone, underwent a pronounced decrease when wave forcing was more energetic, compared to values observed during calmer conditions. The explanation for this result appears to involve the formation -in wave-dominated conditions -of metre-scale wavelength, 20 cm high ripples on the rising tide, which are then planed flat by the swash and/or the shore break on the subsequent ebb.

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Section: Introductionmentioning

confidence: 99%

“…Of these, only Ivamy and Kench (2006) and Curtiss et al (2009) deployed instruments in the intertidal zone -i.e. where sensors would be subjected to the energetic conditions associated with the shore break.…”

Section: Introductionmentioning

confidence: 99%

Sediment dynamics on a steep, megatidal, mixed sand–gravel–cobble beach

2014

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“…The vast majority of research into the swash morphodynamics of coarse-grained beaches has been concerned with PG beaches, particularly of relatively small-scale processes during mild wave conditions (e.g., Horn et al, 2003;Austin and Masselink, 2006;Ivamy and Kench, 2006;PedrozoAcuña et al, 2006;Austin and Buscombe, 2008;Masselink et al, 2010) and, more recently, during energetic wave conditions Almeida et al, 2014). Typically PG beaches are different in form to MSG and CSG, and the morphodynamics of MSG and CSG are distinct and potentially more complex than either pure sand (PS) or PG beaches (Kirk, 1970;Jennings and Shulmeister, 2002;Kulkarni et al, 2004;Pontee et al, 2004;Ivamy and Kench, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Typically PG beaches are different in form to MSG and CSG, and the morphodynamics of MSG and CSG are distinct and potentially more complex than either pure sand (PS) or PG beaches (Kirk, 1970;Jennings and Shulmeister, 2002;Kulkarni et al, 2004;Pontee et al, 2004;Ivamy and Kench, 2006). There is further evidence to suggest that the hydrodynamic regimes and morphological response on MSG and CSG beaches will be different from PG and PS beaches, largely due to the differences in the transport and permeability characteristics of sand and gravel (Pontee, et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Swash Zone Morphodynamics of Coarse-Grained Beaches During Energetic Wave Conditions

Almeida¹,

Masselink²,

Russell³

et al. 2014

Int. Conf. Coastal. Eng.

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A 2D laser-scanner was deployed on four different coarse-grained beaches (Chesil, Loe Bar, Hayling Island and Seascale -all in UK) to measure the swash morphodynamics during energetic wave conditions (offshore Hs > 2m). Field observations performed with the laser-scanner showed that different types of coarse-grained beaches present contrasting morphological responses under energetic hydrodynamics. The surf scaling parameter, a proxy of the morphological condition and wave steepness on the swash, showed an inverse relationship with the extreme vertical runup illustrating that runup is enhanced by low steepness swell waves for a given coarse-grained beach\slope; nevertheless additional parameters are needed to explain the entire runup variability.

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“…Even though the understanding of beach morphodynamic evolution is essential for both developing predictive models and effective beach management, research on coarse grain beaches is scarce, with existing studies either limited to geological time scales (Kirk, 1980;Carter and Orford, 1984;Carter, 1986) or short-term scales (Jennings and Shulmeister, 2002;Pontee et al, 2004;Ivamy and Kench, 2006;Masselink et al 2010;Alegria-Arzaburu et al, 2010). Besides, these studies were done on either pure gravel or mixed sand-gravel beaches.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Cross-Shore Profile Evolution of a Sand and a Composite Sand-Gravel Beaches

Karunarathna

Horrillo-Caraballo

Ranasinghe³

et al. 2012

Int. Conf. Coastal. Eng.

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In this paper, cross-shore morphodynamic evolution of a sand and sand-gravel composite beach, are compared and contrasted used historic surveys of beach profiles. The differential behavior of cross-shore morphodynamics at a range of time scales covering event-scale dynamics up to intra-annual scale variability are investigated and discussed. The application of equilibrium concept to both beach types is explored through Dean's equilibrium profile and Vellinga's beach erosion profile. Variability of cross-shore profile dynamics are quantified and discussed through bulk statistical analysis. Multi-scale morphodynamic trends are determined using Empirical Orthogonal Eigenfunction (EOF) analysis. The above analysis enables to recognise failure mechanism of each beach type during a storm.

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Hydrodynamics and morphological adjustment of a mixed sand and gravel beach, Torere, Bay of Plenty, New Zealand

Cited by 57 publications

References 33 publications

Sediment dynamics on a steep, megatidal, mixed sand–gravel–cobble beach

Sediment dynamics on a steep, megatidal, mixed sand–gravel–cobble beach

Swash Zone Morphodynamics of Coarse-Grained Beaches During Energetic Wave Conditions

An Analysis of Cross-Shore Profile Evolution of a Sand and a Composite Sand-Gravel Beaches

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