Questions tagged [tides]
Tides are the periodic fall and rise of sea-level due to gravitational forces of the moon, sun or earth-rotation. When asking questions specifically about tides, use this tag and also include the [ocean], [moon], [sun] or [earth-rotation] tag if appropriate.
60
questions
0
votes
0
answers
34
views
Reason behind diurnal tides
I know that an area has a diurnal tidal cycle if it experiences one high and one low tide every lunar day. Many areas in the Gulf of Mexico experience these types of tides. I read that:
Diurnal tides ...
- 267
1
vote
1
answer
38
views
How to construct the tide signal from harmonic constituents?
I am trying to reconstruct the astronomical tide time series from harmonic constituents (calculated from T_Tide).I am using the equation that all knows H(t) = Amplitude * cos ( t * harmonicSpeed + ...
- 55
3
votes
0
answers
68
views
How do I determine the phase lag for a tide
I want to determine the height of a sine wave for some tidal constituents for which I would use the following equation: 𝑌(𝑡)=𝐻cos(𝜔𝑡−𝜙), where H is the amplitude, 𝜔 is the speed of rotation, t ...
- 31
3
votes
1
answer
58
views
Do the 600 satellites that orbit the Earth have any gravitational pull on the tides like the moon?
I know that space is big and satellites are small compared with the moon, but do they have, or will they if we get more, any effect on the sea and ocean water on the earth?
- 111
3
votes
1
answer
92
views
What would be the effect of a geostationary moon?
What kinds of differences from our Earth would we see with a moon in a geostationary orbit over the equator? Assuming the gravitational pull is roughly the same as it is with ours (my back of the ...
- 133
6
votes
2
answers
128
views
Why is the time interval between tides so irregular?
Looking at the tidal calendar for the German North Sea, I wonder why the interval between times is so irregular. Internet searches lead to pages that say the tides should be regular 24 hours 50 ...
- 61
2
votes
0
answers
27
views
Velocity boundary conditions from water depth time series
Currently, I am setting up a hydrodynamic model for a coastal zone. For this purpose I need to impose the velocity and water level at the open boundary.
Tidal models (e.g. TPXO) can give both velocity ...
- 133
4
votes
1
answer
136
views
Effects of Dredging Estuary Channel on Water Flow
Is it possible to make some generalizations about the hydrographic effects of dredging a channel into an estuary? Or is it too complex a problem and each case must be considered independently?
Let me ...
- 41
3
votes
2
answers
263
views
How large were Mars' ocean tides and to what extent could they keep the oceans mixing and tend to keep salinity uniform? Has this been modeled?
This answer to Salinity of Martian water 3.5 Billion years ago in Astronomy says that most estimates of Mars' ocean's salinity are pretty high;
The article "Water Activity and the Challenge for ...
- 6,942
4
votes
1
answer
63
views
Why do ocean tides have negative and positive terms in their effects on Stoke's coefficients for calculating geopotential?
I have recently started working on calculating a Geopotential model based on GGM05C. In order to obtain a model as accurate as possible, some corrections must be applied to the normalized Stokes' ...
- 233
5
votes
1
answer
177
views
Why is the tidal range at the entrance to the bay of fundy so high?
This question is a continuation of my previous question: Questions about the validity of a certain model for tidal resonance at the Bay of Fundy. I need to answer this question in order to return to ...
- 191
3
votes
0
answers
106
views
Questions about the validity of a certain model for tidal resonance at the Bay of Fundy
I'm currently working on a (relatively-simple) fluid-dynamics model of the tidal resonance at the Bay of Fundy, a place which is known for his world-breaking tidal range (15 meters on average, while ...
- 191
6
votes
1
answer
147
views
Calculating Love numbers (tidal deformation) for non-homogeneous planets
I have a question about planetology. I'm not sure if it belongs here, but the astronomy stack exchange seemed a bit odd, too.
I would like to enhance my understanding of Love numbers. Love numbers ...
- 305
0
votes
1
answer
53
views
Would it be possible, from the earth’s creation or during its various geomorphological changes, for all the following hypotheses to be probable?
I’m designing a fictional world setting for a game, and I would like to know whether it has a relative coherence based on science. (Don’t mind if it is an almost improbable scenario).
Would it be ...
- 101
3
votes
1
answer
489
views
"Major Lunar Standstill" causing high tides?
The Major Lunar Standstill, as the cycle is called, has been followed by serious starwatchers since the Babylonians. Like clockwork every 18.6 years, it triggers severe tide spikes, swells, and floods,...
- 2,339
5
votes
3
answers
509
views
Is it possible to predict the maximum daily/annual tide height without calculating hourly heights?
It's possible to predict tide at a given location and at a given time reasonably well (e.g. predicting low tide). And there are tools available that make it possible to do this calculation for any ...
- 5,377
2
votes
1
answer
77
views
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?
...
- 151
1
vote
2
answers
197
views
What has been the influence of the moon on Earth's temperature?
What proportion of Earth's internal heat is generated by tidal flexion as a result of the orbiting moon, and would it have been significantly greater four billion years ago when the moon was closer? ...
- 4,507
7
votes
1
answer
134
views
Tidal flow in an estuary
I am working on a project. Where this bacteria has been deposited at a port in the Humber Estuary. Where it has been deposited has been marked in red. I am trying to work out the limits of where this ...
- 73
1
vote
1
answer
376
views
What is the significance of amphidromic points related to tides?
On reading about tide formation and the role of moon's gravitational force, I came across the term amphidromic point. Could someone please elaborate this concept?
- 126
6
votes
3
answers
459
views
Do flights affect tides?
Can artificial satellite positions affect tides? on Space Exploration.SE asks if artificial satellites can affect tides, because they are a lot closer than our natural satellite, even though they are ...
- 290
5
votes
0
answers
35
views
Is it possible to know the tides of a particular location 50 years or 100 years from now?
Assuming no change in sea level (for the sake of argument), is it possible to know the high and low tides a half century or more in the future? Is information like this available to the general ...
- 334
11
votes
2
answers
17k
views
Why do high tides occur simultaneously on opposite sides of the Earth?
Most explanations for high tides say high tides come from water being attracted by the moon (2/3) and the sun (1/3). Attraction occurring in the direction of the moon is visible on the side close to ...
- 213
8
votes
2
answers
126
views
What goes into a tide power prediction for every fifteen minutes over the next twenty five years?
I was watching a segment about tidal power generation on a PBS NewsHour broadcast. I've set the time code at about 11:45 to capture a little background. This bit ...
- 6,942
1
vote
0
answers
51
views
Topography and flash flooding
I'm looking for a study or document showing the effect of the topography, slopes, the sea level and the tide on flash flooding occurrence.
Thanks in advance
- 31
2
votes
1
answer
109
views
Global tide calculation
I am familiar with the concept of harmonic tide coefficients and was wondering about the simplest software solution to calculate tides anywhere, worldwide.
Are there any available, open source ...
- 151
9
votes
2
answers
286
views
How was Venice flooded?
If I understand this correctly, Venice was not flooded due to sudden rainfall causing rivers to overflow, but due to the high tides. These high tides were caused by an alignment of sun, which was ...
- 457
9
votes
3
answers
689
views
How is sea level measured?
In comments on Earth changes due to global climate change, sea level changes is a common topic. I hear quotes about sea level changes in the centimeter and even millimeter range and wonder how such ...
- 191
5
votes
1
answer
97
views
What proportion of the energy input to the ocean tide system comes from the sun?
The earth's ocean tides are primarily driven by the moon, but also by the sun. The relative strengths of the related tidal constituents varies from place to place across the globe. But what is the ...
- 5,870
4
votes
0
answers
55
views
Simple numerical model of tide with an elliptic scheme
I have recently been given the task of developping a coastal model for tides. I have a few requirements, it must not be time stepping in order to be as fast as possible and in finite differences ...
- 41
0
votes
1
answer
1k
views
Can tides at night by consistently higher than in the daytime? [closed]
Can the tides at night be consistently higher than in the daytime in southwest Australia in the port of Fremantle?
Also, what is the explanation for the tides being significant during a part of the ...
- 1
4
votes
0
answers
128
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 ...
4
votes
1
answer
93
views
High tides at Venice
I read somewhere that the new MOSE system can withstand a maximum rise in water of about 3m. I was wondering if that extreme case will happen on the coast line of Lido di Venezia, there will be a ...
- 161
8
votes
1
answer
703
views
How come the tide is low when the moon is high in the sky
Happily spending my holidays in the Fiji Islands, I noticed a couple of days ago that when the moon was very high in the sky (my shadow was maybe 0.5-1m long) the tide was low. That really puzzled me....
- 83
4
votes
2
answers
534
views
What was the storm surge height from Hurricane Harvey?
The numbers bandied about have been 3.6 m (12 feet) and even 4.6 m (15 feet), but something told me that was unlikely. As a guy who could "almost" slam dunk a basketball, the idea of a 3 m (10 feet) ...
- 143
2
votes
0
answers
83
views
Are ramp pumps the solution to the global water problem? [closed]
For the past few years people have been trying to solve the global water problem (especially in Africa), and what better way than being echo friendly.
So my question is, can you use the tidal energy ...
- 29
15
votes
3
answers
6k
views
How will sea level rise be distributed across the globe?
Sea level rise from melting glaciers will not be uniformly distributed across the globe. However, it isn't clear to me what places will have the most and least extreme changes in sea level rise. I ...
- 12.9k
10
votes
2
answers
482
views
Is the Earth heated up by the tides?
Reading about moons of other planets they often get heated up by the tides so for example Io and Europe of Jupiter get friction by which eruptions and liquid water can arise. But is there also an ...
- 2,503
6
votes
2
answers
3k
views
Why do high tides vary month to month?
I've noticed that some ‘highest‘ high tides in one month are bigger than the highest high-tide of previous months. Why is this so?
- 163
0
votes
1
answer
71
views
Musing on Earth's gravity
(a) What, if anything, is the difference between Earths geographic center, i.e. mid-point of the spin axis, and the gravitational center?
(b) What is the average distance between the Earth's center ...
- 14.1k
3
votes
1
answer
2k
views
Why don't spring tides occur at full/new moon (age of tide)?
Tides observations everywhere show that spring tides occur not at full or new moon, at the time of maximum driving forces, but typically a day or two later.
What causes this delay?
- 15.3k
4
votes
1
answer
2k
views
How often do king tides (perigean spring tides) occur?
Recently, there has been a lot of information about "King Tides" (i.e, perigean spring tides) on the news with a number of groups relating the peak king tide to future normal conditions (2050) under ...
- 15.3k
2
votes
1
answer
232
views
How to correct PSMSL data for GIA?
I have a PSMSL RLR (revised local reference) sea level dataset with records from various tide gauges. Can anyone explain how to correct them for GIA (glacial isostatic adjustment) using the ICE-5G ...
- 21
4
votes
1
answer
156
views
Relationship between tides and earthquakes
Ide et al. (2016) suggest that earthquakes (especially those of high magnitudes) are more probable during periods of high tidal stress (during full and new moons). While they show a comprehensive ...
- 15.3k
3
votes
2
answers
2k
views
What would be the impact on tides if the earth had no tilt?
I would like to know what would be the impacts/effects on the tides if earth were to have no tilt (perpendicular to plane of ecliptic)?
- 101
4
votes
2
answers
2k
views
When specifying phase and amplitude for a tidal constituent, what date/time does phase start from?
It is common to describe tidal elevations at a given location by giving the phases and amplitudes of tidal constituents. One such application is for setting the open boundary conditions for regional ...
- 5,870
9
votes
1
answer
1k
views
The motion of tides
I found this animation from a satellite:
which shows the motion and elevation of tides on a certain date. Can you find an animation of a date when there is a spring tide?
my question is as follows:
...
user6402
5
votes
1
answer
1k
views
Definitions of tidal harmonic constituents...?
Does anyone know where there is a detailed definition for tidal harmonic constituents? There is loads of stuff on $M_2$, $S_2$, $N_2$, etc. (all the common ones), but there are a great many more, some ...
- 123
2
votes
0
answers
41
views
Phase of S2 constituent in tidal prediction
I ran the ETERNA code for the prediction of tidal gravity at some station. Then I use Fourier analysis to recover the amplitude and phase of the S2 constituent. As I understand, the phase of the S2 ...
- 21
3
votes
1
answer
2k
views
How much do tides affect earth's rotational velocity?
Many of us are familiar with an exaggerated picture of the Moon's effect on Earth's tides:
Since the Earth is not uniformly covered with water, however, I imagine that the tidal effect will depend on ...
- 273