Wave-current interaction models for rip currents

A finite element model has been developed to study the effect of currents on the wave propagation in and around arbitrarily shaped harbours of variable depth. The model solves an elliptic mild-slope type of equation for time-harmonic waves, and thus circumvents the limitations of existing models for wave-current interaction in coastal areas, which apply a parabolic approximation. Numerical examples are presented, both for schematized cases, as the effect of "rip currents" on normal incident waves on a sloping beach, and for a realistic geometry.

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On the instability leading to rip currents due to wave–current interaction

Journal of Fluid Mechanics ◽

10.1017/s0022112005008335 ◽

2006 ◽

Vol 549 (-1) ◽

pp. 403 ◽

Cited By ~ 8

Author(s):

JIE YU

Keyword(s):

Rip Currents ◽

Current Interaction

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A COASTAL AREA MODEL CONSIDERING WAVE-CURRENT INTERACTION AND ITS APPLICATION TO WIDE-CRESTED SUBMERGED BREAKWATER

Coastal Engineering Proceedings ◽

10.9753/icce.v33.sediment.12 ◽

2012 ◽

Vol 1 (33) ◽

pp. 12

Author(s):

Masamitsu Kuroiwa ◽

Ahmed Khaled Seif ◽

Yuhei Matsubara ◽

Yasushi Ichimura ◽

Hajime Mase ◽

...

Keyword(s):

Predictive Model ◽

Balance Equation ◽

Coastal Area ◽

Artificial Reefs ◽

Height Distribution ◽

Rip Currents ◽

Submerged Breakwater ◽

Wave Height Distribution ◽

Scour Hole ◽

Current Interaction

This study is concerned with development of a 3D morphodynamic predictive model for considering wave-current interaction by using wave action balance equation. The developed model was applied to model tests associated with a detached breakwater and wide-crested submerged breakwaters, and the influences of strong currents around the structures into wave height distribution and bathymetry change were investigated. Furthermore, the morphodynamics around the artificial reefs in the Uradome Beach, Tottori, Japan, was computed. From the computed results, a large scour hole due to strong rip-currents in the opening of the reefs was reproduced. The applicability of the model was confirmed.

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Linguistic Interactions: A Therapeutic Consideration for Adults With Aphasia

Perspectives on Augmentative and Alternative Communication ◽

10.1044/aac17.3.93 ◽

2008 ◽

Vol 17 (3) ◽

pp. 93-98

Author(s):

Lynn E. Fox

Keyword(s):

Clinical Outcomes ◽

Social Contexts ◽

Interaction Models ◽

Social Communities ◽

Wernicke's Aphasia ◽

Communication Challenges ◽

Therapeutic Consideration ◽

Patterns Of Interaction ◽

Structural Language

Abstract Linguistic interaction models suggest that interrelationships arise between structural language components and between structural and pragmatic components when language is used in social contexts. The linguist, David Crystal (1986, 1987), has proposed that these relationships are central, not peripheral, to achieving desired clinical outcomes. For individuals with severe communication challenges, erratic or unpredictable relationships between structural and pragmatic components can result in atypical patterns of interaction between them and members of their social communities, which may create a perception of disablement. This paper presents a case study of a woman with fluent, Wernicke's aphasia that illustrates how attention to patterns of linguistic interaction may enhance AAC intervention for adults with aphasia.

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