Oscillatory Ripple Geometry

Vongvisessomjai, Suphat

doi:10.1061/(asce)0733-9429(1984)110:3(247)

Cited by 28 publications

(24 citation statements)

References 13 publications

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“…There have been several attempts to represent the contribution of ripples to the relative bed roughness (Vongvisessomjai, 1984;van Rijn, 1989). The effect of ripples is represented in the model by (Nielsen, 1992):…”

Section: Beach Materialsmentioning

confidence: 99%

Modeling the erosion of cohesive clay coasts

Trenhaile

2009

Coastal Engineering

105

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Section: Beach Materialsmentioning

confidence: 99%

Modeling the erosion of cohesive clay coasts

Trenhaile

2009

Coastal Engineering

105

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“…Overall, a thorough understanding of the vortex and turbulence structure and sediment motion micro-mechanisms in the wave-current boundary layer is necessary in the future. Nielsen(1981) Vongvisessomjai(1984 Wiberg and Harris(1994) Mogridge et al(1994) Nielsen,1992) …”

Section: Discussionmentioning

confidence: 99%

“…However, at low χ , corresponding to large wave period scale conditions, A 0 /d values predicted by Nielsen (1981) and Mogridge et al (1994). are greater than those predicted by Vongvisessomjai (1984) and very much greater than the value of 2100 predicted by Wiberg and Harris (1994). Through the comparison of predicted and measured results, the Nielsen (1981) and Mogridge et al(1994) methods are recommended for predicting ripple geometry under waves, especially for large wave period scale conditions.…”

Section: Bed Formsmentioning

confidence: 94%

“…Li and Amos (1998) used a factor u *w /u *c to distinguish current-dominated ripples (u *w /u *c <0.75), wave-current ripples (0.75<u *w /u *c <1.25), wave-dominated ripples (1.25< u *w /u *c <2), and pure wave ripples (2<u *w /u *c ), where u *w , u *c represent bed shear velocity for waves-only and current-only conditions, respectively. Kleinhans (2005) Many formulas are available for predicting ripples under waves, such as the Nielsen (1981) formula, Vongvisessomjai (1984) formula, Wiberg and Harris ( 1994) formula, Mogridge et al ( 1994) formula, and so on. Although based on different assumptions, these formulas exhibit similar structures:…”

Section: Bed Formsmentioning

confidence: 99%

“…O'Donoghue and Clubb ( 2001) had ever compared the prediction methods in respect of A 0 . In case of Nielsen (1981), Vongvisessomjai (1984), Wiberg and Harris (1994), and Mogridge et al (1994), A 0 depends on sediment diameter, d, and a period parameter, Vongvisessomjai (1984), Wiberg and Harris (1994), and Mogridge et al (1994) formulations. Fig.3 reveals very important differences between the prediction methods in respect of A 0 .…”

Section: Bed Formsmentioning

confidence: 99%

See 2 more Smart Citations

Advances in sediment transport under combined action of waves and currents

Lü

Zuo

et al. 2015

International Journal of Sediment Research

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Temporal and spatial evolution of wave‐induced ripple geometry: Regular versus irregular ripples

Nelson

Voulgaris

2014

JGR Oceans

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Concurrent observations of inner shelf near bed hydrodynamics and acoustic imagery of the seabed are used to relate wave-induced ripple geometry (wavelength and orientation) to near bed directional wave velocities. The observations were collected on the continental shelf of the South Atlantic Bight at water depths of 9.5 and 30 m off the coasts of South Carolina (median size 177 mm) and Georgia (388 mm), respectively. 2-D spectral analysis techniques are performed on the imagery to automate detection of ripple wavelength, orientation, and irregularity. Our analysis shows that ripple irregularity is a time-dependent process dependent on magnitude, direction, and duration of wave forcing. During energetic events, ripple geometry changes rapidly and the ripples align with the main wave direction. During periods of low energy, close to the critical conditions for initiation of sediment motion, ripple evolution occurs at a much slower rate often leading to irregularities such as terminations and bifurcations along the ripple crest. Under constantly changing wave direction, the rippled bed becomes highly disorganized. Six types of ripples are defined based on newly developed irregularity parameters: linear, bifurcating-linear, linear-bifurcating, bifurcating and cross, irregular, and disorganized beds. Ripple irregularity depends on the time history of the bed; ripples remain irregular until their wavelength and orientation attain a nearly equilibrium geometry. The observations collected provide significant information on the response of the seabed to wave forcing and identify processes that should be reproduced by any time-dependent ripple prediction model. Ripple irregularity can only be predicted using such timedependent models.

show abstract

Oscillatory Ripple Geometry

Cited by 28 publications

References 13 publications

Modeling the erosion of cohesive clay coasts

Modeling the erosion of cohesive clay coasts

Advances in sediment transport under combined action of waves and currents

Temporal and spatial evolution of wave‐induced ripple geometry: Regular versus irregular ripples

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