# Questions tagged [waves]

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### What happens to seismic waves reflected back to the surface?

What would be the behavior of seismic waves when it hit the geological media? The waves coming from a source hits different boundaries with different energies, the wave will be reduced in energy by ...
48 views

### What is the correct velocity to calculate propagation speed of a Rossby Wave?

Rossby Waves have different phase- and group velocities. For a pure zonal wave with wave number k they are $$v_p=\overline u - \frac{\beta}{k^2}$$ $$v_g=\overline u + \frac{\beta}{k^2}$$ So group ...
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### Using radar to measure ocean waves along the shoreline

What radar technology would be best to measure the attributes of ocean waves near (under 2k distance) the shoreline?
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### Sea waves with perpendicular discontinuity

This is a sea/ocean wave image which can be found in several places on the internet. I cannot find its origin and any image search did not yield conclusive results. It may even be a render. Question: ...
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1 vote
56 views

### What are the inhibiting factors that are hindering ocean wave-based electricity generation?

Considering the amount of available energy there is for the conversion to electricity (ocean waves being endless) I would imagine more attention to this approach by all energy based-companies, as well ...
78 views

### Geostrophic adjustment with shallow water equations

The linearized f-plane shallow water equations are: $du'/dt - fv' = -g(d eta'/dx)$ dv'/dt + fu' = -g(d eta'/dy) (d eta'/dt) + H((du'/dx)+(dv'/dy)) = 0 where g is ...
58 views

### Beaufort wind force measure

Beaufort scale relates wind speed and wave height of the ocean surface. Does the wave height in the scale refer to significant wave height or mean wave height?
41 views

### Validation parameter of spectrum model

In Ocean spectrum modelling there are different modelling procedures are available such as Fung Lee model, JONSWAP model, Elfouhaily model, WWIII model and SWAN model. Among those models based on ...
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### Water rushing out to meet wave term

Is there a word for the phenomenon of water seeming to rush out to meet an oncoming wave? Perhaps it's more of a physics terminology question?
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### Are there any types of winds or waves that are produced just by Earth's rotation?

Are there any types of wind or waves caused and produced only and exclusively by Earth's rotation? Not influenced by Earth rotation, but produced solely by it? In the case of waves, are Rossby waves 1 ...
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### Book recommendation on waves

I am looking for a book about waves in the context of Earth Science, the two main topics I have in mind are ocean waves and seismic waves. Explanations in a book like Understanding earth1 is too ...
225 views

### Atmospheric gravity waves or cumulus cloud street?

I observed these clouds today (november 12, Belgium) and I was wondering if they could be caused by atmospheric gravity waves. How would you spot the difference between gravity waves and a cloud ...
1 vote
58 views

### What are the boundary conditions for Navier's Equations of motion in seismic?

Navier's equations of motion in seismic have 3 solutions, according to how it is resolved (boundary conditions): for Vp (compression waves) for Vs (shear waves) for Vr (Rayleigh waves) I know the ...
• 111
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### Wave height data for Indian east coast

For my project, I am looking for wave height information. My study area is the Odisha coast of the Bay of Bengal. What I have gathered from various research papers is that significant wave height is ...
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### The effect of enclosed channels and breakwaters on wave height and velocity

Some context: I row every morning, and due to my rowing club's proximity to a large lake, it is often very windy and rough (which builds character, according to the coaches). I noticed that as we row ...
60 views

### Is there any information on the height of waves near New Zealand resulting from today's M 8.1 Kermadec Islands earthquake?

The video in this tweet shows the small wave produced at Tokomaru Bay in New Zealand following the M 8.1 - Kermadec Islands, New Zealand 2021-03-04 19:28:31 (UTC) event. These are so far the only ...
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1 vote
219 views

### Horizontal slowness in seismology

I am working on a seismology assignment and it starts with the fundamentals of seismology such as the wave equation, the slowness... such as the question below: write an equation describing the ...
• 161
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### Are ocean waves diminished, enhanced or unaffected by underwater obstacles

Suppose you have a wave heading towards the beach, and under the water the surface rises suddenly then drops again back to the typical average slope of the coastline, does this have a muting affect on ...
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1 vote
29 views

### SWAN doesn't run [duplicate]

I'm Ocean Engineering Master Student. I'm not an expert in SWAN. I have some problem with it. Previously my result like rotated so I take another option to make grids using GridBuilder but SWAN doesn'...
1 vote
113 views

### SWAN WAVE model: Strange result

I'm Ocean Engineering Master Student. I have some problems with my research. When I plot the result it is rotated. The color blue one is land. This my script, what should I do to fix the problem? <...
56 views

### Tidal current energy chart - Messina Strait

I am a student in industrial engineering, and I am doing a business plan related to exploiting Messina Strait current for electrical energy. Does anyone have a tidal stream chart (either with velocity ...
1 vote
135 views

### What would be the phase shift and polarity of a seismic wave upon reflection

What would be the phase shift and polarity of a seismic wave a) when it hit the free surface b)when the free surface reflection goes down and hit a reflector and returned to the receiver placed on the ...
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### What are good oceanographic journals

I am a developer with a oceanographic side project. I did some ML on wave & tide data and thought of publishing it in a paper. What are some good journals to send it to? Any recommendations? ...
• 161
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### How can oceanic Rossby waves move from East to West?

I can find several examples of Rossby waves, mainly atmospheric, moving towards East. Is it possible that they also move towards West?
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### Why are there waves in seas towards shore - even in night?

Waves are mostly caused by Friction of wind on surface of water. Wind blows from sea to land in day and land to sea in night due to pressure and temperature difference. So it is intuitive why there ...
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### SWAN wave model: HSIG is strangely low

I have a question about SWAN wave model, I tried to ask it at the SWAN mailing list, but with no luck, so I'm asking here. First of all I have to admit I'm not a professional SWAN user. All the ...
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1 vote
439 views

### Highest land altitude a tsunami has ever reached (record)

When a tsunami gets into the coast we are approximately at 0 meters above average sea level (AASL). And then it starts ascending in the uphill land... 1m AASL... 2,3... 5,10 m AASL etc. That is ...
• 111
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### If a very huge Earthquake occured anywhere on Earth could waves emerge to come together again on the opposite side?

Suppose that a super-powerful earthquake occurred anywhere on Earth, say one with the value 10 on Richter's scale. The quake can have any value but as can be read in a comment below the highest value ...
2k views

### Why do P waves have a higher velocity in the lower mantle than in the core even though the core has a much higher density?

I've just started teaching 9th grade Earth science and my students and I have noticed something about P and S wave depth vs velocity graphs. In the typical graph, eg: https://www.researchgate.net/...
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### What's really happening with "stormquakes"?

The PBS Newshour article Scientists discover big storms can create ‘stormquakes’ says: A stormquake is more an oddity than something that can hurt you, because no one is standing on the sea floor ...
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1 vote
117 views

### Complex Empirical Orthogonal Function analysis on Propagating wave

Since Complex EOF (CEOF) is doing hilbert transform before general EOF, we can get four outputs in each mode. Magnitude spatial pattern Magnitude time series Phase spatial pattern Phase time series ...
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1 vote
220 views

### wave speed is smaller than both horizontal wave speed and vertical wave speed?

I am new to GIS and just get the idea of slowness. I can understand why people need the slowness in GIS rather than just the reciprocal of velocity. However, I feel the definition of slowness is weird ...
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1 vote
609 views

### Sea cave vs Sea arch

How do you distinguish sea cave from sea arch? If I want to classify a crack of sea cliff as sea cave, has it to have a dead end? Would you call a geological formation as a sea cave even a kayak can ...
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1 vote
153 views

### reverse time migration for wave equation PDE using SBP-SAT

I'm stuck implementing a reverse time migration technique, the PDE(partial differential equation) being implemented is an acoustic wave equation, The numerical method being used is a FD(finite ...
835 views

### How does multiple layer seismic reflection work? How do we distinguish arrivals from different layers and their velocities?

Whenever we are investigating multiple layer interfaces in a seismic reflection survey the root-mean-squared velocity is often employed to deduce travel time to a certain n-th layer and also to deduce ...
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### Travel Times for Seismic Wave Types - Why reflected t-x plot curves

I do not understand how the reflected wave in a seismic survey has a steepening slope (slows down) Please bear with me as I lay out my thoughts because I feel like I can grasp all of this except this ...
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1 vote
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### Where can I find wave height/period, current velocity and wind speed/direction data at the Qiangzhou strait in China?

I'm looking for time series of wave height/ period, velocity currents and wind speed/direction specifically for the Qiangzhou strait in China. Global data sets could also work.
180 views

### Do sound waves from volcanic eruptions travel around the world?

Do sound waves from volcanic eruptions travel around the world? I recently read about the Krakatoa eruption and how sound waves from that eruption traveled around the globe 4 times and were detected ...
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1 vote
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### How the stepness can be computed at NDBC from site with only dominant wave data and windwave data

Hi guys I have an small question here. At the NDBC website they have at most of the buoys the steepness of the sea at that time and date: http://www.ndbc.noaa.gov/station_page.php?station=46012 ...
81 views

### How is wind made [duplicate]

Everyone surely enjoys waves in the beach, but one question that has always been hovering around my head was about the wnd. I have always been told that waves are formed by wind and all, but then ...
131 views

### Presence of cross stratified conglomerates in fan deltas

Why are cross stratified conglomerates found in deposits of fan deltas? I know that fan deltas are alluvial fans that deposit directly into the sea, hence they are poorly sorted.But could not ...
882 views

### How are chenier ridges and strand plains formed at wave dominated coastlines?

In the attached image, we can see chenier ridges and strand plains. How are they formed and what is the involvement of rip and longshore currents in their formation?
596 views

### Why does wind blowing against a strong current create way bigger waves?

It's a well known fact that wind will cause very big waves if blowing against a strong current, for example in the gulf stream off the US coast, or in the bay of San Francisco with a very strong (5 ...
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1 vote
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### Looking at the brightest parts of the image how would one find the blackbody curve and wavelength maximum using a radiance calculator?

Look at the brightest parts of the photo and use a radiance calculator to find the blackbody radiation curve (show the plot of the curve) and the wavelength of maximum emission. How do ...
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1 vote
247 views

### Searching for common wave vocabulary

What do you call the leading waves and activity leading before a large wave?
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### Wavewatch III data

I need to simulate some ocean data on the south coast of France, near to Marseilles. Ideally I am looking for parameters such as wind direction, wind speed, significant wave height, peak wave period ...
220 views

### How does wind cause large waves?

I was just wondering about the large waves associated with storms. It seems a little counter-intuitive that large masses of water can be put into motion by moving air (which is much lighter than water)...
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### Depth of the wind-induced currents and the shoreline

In the open sea the speed of the current in the developed sea can be estimated as 3% the wind velocity at 10 meters. Why is ocean surface velocity around 3% of wind velocity? Is there a similar ...
108 views

### ERA Interim problem with Waves

Has anyone had a problem with significant wave height (swh) and mean wave period (mwp) from ERA-Interim not matching very well with either a time series of measurements or a different model? Or does ...
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### What might cause these "wave clouds" near the horizon? Could it be gravity waves?

I found this image on a website - returned as a HTTP error 404 'not found'. But the clouds look strangely repetitive. At first I thought the image had been "photoshopped", but as @gerrit pointed out ...
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