Questions tagged [waves]

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1answer
40 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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2answers
47 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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1answer
26 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 ...
4
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1answer
84 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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2answers
96 views

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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1answer
35 views

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.
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0answers
67 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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1answer
30 views

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 ...
2
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1answer
50 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 ...
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0answers
113 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 ...
5
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0answers
220 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?
5
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1answer
190 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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0answers
23 views

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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1answer
158 views

Searching for common wave vocabulary

What do you call the leading waves and activity leading before a large wave?
3
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1answer
126 views

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 ...
4
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1answer
68 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)...
5
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1answer
404 views

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 ...
6
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2answers
93 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 ...
5
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1answer
178 views

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 ...
7
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1answer
116 views

How much water does a wave transport into a sea cave?

How much water is transported (volume) as a wave travels into a sea cave? The wave has a height of 1 m and a period of 12 seconds. The average water depth at the cave mouth it 5 m and the width is 15 ...
5
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1answer
539 views

The mean direction of waves in a directional distribution

When modelling ocean waves, a directional distribution $D_f(\theta)$ is used together with a frequency spectrum $S(f)$ to describe the energy of waves at a particular frequency $f$ and angle $\theta$. ...
7
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2answers
260 views

Are these clouds exhibiting gravity waves?

This is a GOES visible channel image from 2017-01-27, about 9 a.m. local time. It's the Atlantic coast of the US. The coast is visible towards the bottom of the image. The scale is large. This ...
7
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1answer
445 views

Units of wave spectrum

In ocean spectra such as the Pierson Moskowitz or the JONSWAP models, the units of $S(\omega)$ are $m^2/(rad/s)$ (or whatever unit of measurement you are working in). Where does the $m^2$ come from ...
7
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1answer
514 views

Analytical solution for seismic wavefield in MATLAB

I have been trying to evaluate the analytical solution for a wave travelling in a homogeneous, infinite media. For a given source $S(t)$, the wave-field can be calculated at a distance $r$, for a ...
2
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1answer
102 views

Any site for monitoring equatorial oceanic waves?

I use Carl Schreck's site Equatorial Wave Zoo for monitoring atmospheric waves such as Kelvin wave, Equatorial Rossby wave, filtered MJO OLR, Mixed Rossby Wave(MRG),etc. Here is an example - Kelvin ...
7
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1answer
102 views

How will climate change affect planetary waves?

You can see planetary/rossby waves in the meanders of the jet stream. In short: If an air parcel moves from warm subtropics towards the pole, it will deviate toward the east due to conservation of ...
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0answers
124 views

Are extratropical cyclones the same as baroclinic waves?

Are extratropical cyclones the same as baroclinic waves? I'm aware of the fact that extratropical cyclones form in 'baroclinic zones' and that they start of as waves. But are these what are referred ...
3
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1answer
906 views

Detecting seismic waves using Software Defined Radio

I understand about physic and waves, but I am a totally rookie in this topic. I was wondering which are the typical frequency ranges of the S-waves, P-waves and surface waves. My idea would be to ...
2
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3answers
720 views

Why is a mild earthquake often mistaken as dizziness or vertigo?

Is it due to the longitudinal nature of the seismic waves? When a heavy bus or truck goes by at high-speed, the shaking in nearby ground is not mistaken as dizziness, rather the feet and body feel a ...
3
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1answer
80 views

How would waves (in a fluid) behave without intermolecular attraction?

Water molecules, as many people know, are polarized, and so water molecules tend to have an attractive force between them. But how would the waves in water behave if this attraction no longer was ...
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2answers
186 views

Waves on sandy beach separating differently-sized rocks?

I recently went to a beach, and I noticed that the sand seemed to have a few distinct regions. I'm wondering what would cause this, and how it works. One region is the part of the beach which is ...
6
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0answers
71 views

Effects of currents on peak wave frequency

I have been analyzing the surface wave measurements taken from the location where the waves interact with both opposing and following currents. I don't understand why the peak frequency decreases ...
4
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1answer
534 views

What is the amplitude of the largest internal wave ever observed?

I have read from Vlasenko et al. (2014) that the largest amplitude of an internal wave recorded in the Celtic Sea is 105 m. Is this the largest ever or have any larger ones been recorded elsewhere (eg....
8
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1answer
540 views

What is a vertical wavenumber?

I can understand that the wavenumber is number of waves or cycles in a given distance. But what would a vertical wavenumber mean? Is it just another term for the wavenumber of a wave that is ...
2
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0answers
114 views

Where can I find wave scatter tables (joint probability Hs vs T) for certain coastal regions?

I am struggling to find a database or free source of joint probability of significant wave height and period, i.e. wave scatter tables. Data for buoys are useful, however not available for regions ...
8
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2answers
717 views

The significance of peak period in surface wave models

The peak period or peak frequency is considered to be an important quantity in characterizing ocean surface waves, including wave models [e.g., 1]. But practically, why are we interested in modelling ...
3
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1answer
310 views

Best book/s of oceanic data treatment and analysis?

I would like to purchase a/some books which are really good and practical references to get into the oceanic data (wave heights,currents and sea level) treatment and statistical analysis, coming from ...
9
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1answer
193 views

Why can't wave models model storm surge?

I found this nice module here on MetEd that gives an overview of the WAVEWATCH wave model. In it, in the Introduction section, it is mentioned that WAVEWATCH cannot model storm surge or tsunamis. Is ...
6
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0answers
98 views

What makes the SWAN wave model suitable for coastal regions?

It appears that the SWAN wave model is adept in shallow water and coastal regions. See for example here and here. What makes SWAN more suitable in these regions than other wave models like WAVEWATCH? ...
8
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2answers
793 views

What is the best way to accurately measure wavelength between crests on a pier?

What is the best way to accurately measure wavelength between crests from a pier?
9
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2answers
441 views

How does a tsunami affect biology and other matter in its path while in deep water

Is everything in the water column going to be affected?
7
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1answer
1k views

What is the meaning of seismic spectral blueing?

What is the meaning of seismic spectral blueing? Please cite any good introductory materials if possible.
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2answers
1k views

At the ocean surface, why do large amplitude waves travel faster than small amplitude waves?

I understand the mathematics behind it but I am looking for an intuitive description.
5
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1answer
3k views

Whitecapping in ocean surface waves

Even though the physics of wave breaking for ocean surface waves may not be well understood, what wave breaking is and what it looks like is no mystery to the average beach-goer. However, I am ...
10
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1answer
2k views

How does one determine the optimum offset in a seismic survey?

I was going through a report on MASW (Multi Station Analysis of Surface Wave) and found this "To avoid the aliasing in the space domain, geophone spacing (Δx) needs to be less than half of the ...
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3answers
849 views

Why do deviated wells show poor correlation to seismic data?

Well correlation and calibration is an important step in any type of seismic inversion. In order to obtain a good broadband frequency model, the synthetics should be correlated with original seismic ...
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0answers
77 views

Availability of mean squared slope or wave spectra data for the sea surface

The mean squared slope is a property of the sea surface that is often sensed by microwave radars [1] [2]. While spatial data for sea surface salinity, sea surface height, and significant wave height ...
12
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1answer
2k views

Should one extract wavelet from seismic or well log for the generation of synthetic traces?

Synthetics are generated by convolving reflectivity series with the known wavelet. I have seen most of the wavelet are extracted from seismic data itself. Is there any hard and fast rule, or can one ...
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0answers
132 views

Problem running the WAM wave model [closed]

In the WAM Cycle 4 wave model, why doesn't the model work for the year 1999? When I tried to run for the year 1999 the model does not produce any results.
14
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2answers
2k views

Software for sediment transport modeling

I am doing a paper about coastal processes and I was told that I should include a sediment transport modeling to further examine my geophysical findings. I was reading in the net and found that ...