On the waves generated over the steady uniform current (Part 1)

1964 ◽  
Vol 11 (2) ◽  
pp. 336
Keyword(s):  
Author(s):  
Anne Katrine Bratland ◽  
Ragnvald Bo̸rresen ◽  
Per Ivar Barth Berntsen

Wave-current interaction refers to the interaction between surface gravity waves and ocean current flow. This interaction implies an exchange of energy, i.e. both the waves and the current are affected. The present paper describes the calculation of wave elevations in higher order unidirectional, irregular waves with a uniform current in deep water. Results for regular waves are compared with those obtained for Stokes second and third order waves with uniform current according to the method described by Fenton [1]. The results for higher order wave elevations in irregular waves have been compared with waves and current generated in a model test basin and reasonable agreement has been found.


1993 ◽  
Vol 251 ◽  
pp. 239-271 ◽  
Author(s):  
Karsten Trulsen ◽  
Chiang C. Mei

When a train of gravity waves encounters an opposing current, the wavelength is shortened and the waves may be reflected. If capillarity is included, the shortened waves may be reflected for a second time and experience further shortening. By this process the initially long gravity waves can be damped by viscosity quickly without breaking. In this paper a boundary-layer approximation is obtained close to the reflection points, and is matched to the ray approximations outside. This is then applied to the propagation of a wavepacket. Damping is accounted for in the ray solution and the result is compared to the undamped solution. The case where the two reflection points coalesce is also considered. It is found that as the separation between the reflection points decreases, the wavepacket appears to remain longer in the region of reflections relative to the width of this region.


1969 ◽  
Vol 37 (4) ◽  
pp. 761-771 ◽  
Author(s):  
Yee-Chang Wang

On the assumptions of incompressibility, and negligible thermal conduction, salinity diffusion and viscosity, simple expressions are derived for the conservation equations of mass, momentum and energy when internal waves encounter an unsteady non-uniform current. These expressions of conservation equations are valid for all kinds of internal waves without regard to their different characteristics. From the dynamical conservation equations, we find that a stress-like term, the ‘excess momentum flux tensor’, plays an important role in the interaction between internal waves and an unsteady non-uniform current. Furthermore, it is deduced from the energy balance equation that, in the encounter of interfacial waves with a steady non-uniform current in a two-liquid system, the waves are amplified in an adverse current but suppressed in an advancing current as a result of interaction of the waves with the current. This conclusion may explain the large amplitudes sometimes observed in internal waves near the confluence of currents and near fronts at the thermocline, the region in the ocean where the density gradient is a maximum.


Author(s):  
Virginia Woolf ◽  
Warner
Keyword(s):  

Nature ◽  
2020 ◽  
Vol 580 (7802) ◽  
pp. 183-184
Author(s):  
Sabine Hossenfelder
Keyword(s):  

Nature ◽  
1998 ◽  
Author(s):  
Eleanor Lawrence
Keyword(s):  

2019 ◽  
Vol 25 (2) ◽  
pp. 202-219
Author(s):  
Aminta Arrington

The Lisu are a largely Christian minority group in south-west China who, as an oral culture, express their faith more through a set of Christian practices done as a group and less through bible reading as individuals. Even so, the Lisu practice of Christianity specifically, and Lisu culture more generally, was profoundly impacted by the written scriptures. During the initial evangelisation of the Lisu by the China Inland Mission, missionaries created a written script for the Lisu language. Churches were constructed and organised, which led to the creation of bible schools and the work of bible translation. In the waves of government persecution after 1949, Lisu New Testaments were hidden away up in the mountains by Lisu Christians. After 1980, the Lisu reclaimed their faith by listening to the village elders tell the Old Story around the fires and reopening the churches that had been closed for twenty-two years. And they reclaimed their bible by retrieving the scriptures from the hills and copying them in the evening by the light of a torch. The Lisu bible has its own narrative history, consisting of script creating, translating, migrating, and copying by hand. At times it was largely influenced by the mission narrative, but at other times, the Lisu bible itself was the lead character in the story. Ultimately, the story of the Lisu bible reflects the Lisu Christian story of moving from missionary beginnings to local leadership and, ultimately, to local theological inquiry.


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