Why are there waves in the sea?
how do they get there? why are they there ?
Answers:
ask the moon
Its just friendly, the sea waves to everybody
i think it is something to do with the moon
Waves are almost wholly the result of the wind blowing across the surface of the water.
Fill a drinking glass with water, then at an angle 0f about 35 degrees blow on it - you will observe that the surface of the water ripples. That is what the wind does to vast expanses of water called Oceans and seas. That is how waves are formed - the wind creates them.
The moons gravitational pull has an effect. If the mood disappeared there would be chaos and loads of floods.
This is due to the Rotation of the earth around itself and rotation of moon around the earth.
there are many factors why sea creates wave, the wind, the movement of the earth to the sun, the gravitational pull of the moon, the heat and cold, the gravity of the earth, etc,.
Waves are generated by a number of things. One of them is the currents, where oceanic currents affect the movement of the water and this has a rippling effect. The closer the resultant ripples get to the coastline where the water is typically shallower, the larger the ripples and this is witnessed as waves.
Another generator of waves is tides. As the tides rise and fall, the body of water moves and creates ripples and waves.
Wind also creates waves. The movement of air disturbs the surface of water and this results in ripples. Accumulatively over many miles the magnitude of the waves gets larger, and again, where the water gets shallower near the coast, the waves gain amplitude (size).
Movements in the earth's crust under the sea also creates waves. This is what a tsunami is - large waves created by sudden movements in the earth's surface under the sea, typically by way of earthquakes. Other tremors, and underwater volcanoes also can have the same effect. Also, earthquakes with an epicenter on land but close to the sea can also result in large waves. A resultant collapse of land mass can create huge waves, such as that caused by the collapse of one side of Mt. St. Helena when it erupted.
Because of the Moon
the moon and wind
the are created by the Ebb and Flow of the tides amongst other things like the weather
They are caused by the gravitational pull the moon causes on earth, and the strength or lack of ferocity of the wind determines the size and strength of them.
Boaz.
Muslim terrorists cause them.
For the same reason that my pubes are curly
Waves found in the ocean have different causes and, therefore, different characteristics. At the surface of the ocean, waves can be generated by the action of wind blowing across the surface, by earthquakes beneath the surface of the ocean, by changes in atmospheric pressure or along its shores or by the gravitational attraction of the sun and moon. Normally these waves transmit energy only, not matter.
Progressive waves show both longitudinal (back and forth) movement and transverse (right angle) movement. This resultant is called orbital movement.
If we observe waves from a fixed point we see troughs and crest passing by. The distance fromm successive crests or troughs is called the wavelength (L). The time interval for the passage of one wavelength is called the period (T). If we know either one, the other can be calculated from the equation because the theoretical relationship is known -
L = 1.56T2:
Speed (S) = L/T = 156m/10s = 15.6m/s
Wave Steepness = H/L
Frequency (f) is the number of wavelengths that pass a fixed point per unit of time:
f = 1/T
for the previous example S = Lf = 156m x 6/min = 936m/min
936m/min x 1min/60s = 15.6m/s
Wind-generated waves can be divided into deep water waves and shallow water waves and transition or intermediate-depth waves. If the depth of the water is greater than L/2 the wave is a deep water wave., For the previous example the wave is a deep water wave as long as the bottom depth is greater than 78m. In deep water waves the movement of an individual water particle is orbital (circular), moving forward with the crest and backward with the trough.
Deep-Water Waves
S = (gT)/(2*pi) = [9.8(m/sec*sec) * T (s)]/2*3.14 = 1.56T(m/sec)
Shallow-Water Waves
When d< L/20 waves are classified as shallow-water waves. They include wind-generated waves as they move into shallow water, tsunamis (seismic sea waves) and the tides generated by gravitational attraction of the sun and moon. For these waves: S (m/s) = sqrt(gD)= 3.1 sqrt(D) Particle motion is shallow-water waves is a flattened ellipse and becomes more horizontal as depth increases. This horizontal motion affects the bottom (as you saw in the lab on waves when you created ripple marks. What about those waves that fall between L/20 L/2?
Transitional or Intermediate-depth Waves
The speed of these waves is determined partially by wavelength and partially by water depth.
Distribution of Wave Energy
Spectral analysis of a wide range of various kinds of waves show the principal generating forces, the principal restoring forces and the energy peaks.
As wind blows across a dead calm sea, capillary waves with rounded crests and V-shaped troughs and wavelengths <1.74cm form. The principal restoring force is surface tension. As more energy is transferred, gravity waves are formed. These have the more typical sine-shaped cross section. If the wind blows long enough, an equilibrium is reached where the wave speed equals the wind speed. This is unusual. Typically we see what is called a >fully developed sea.
In an area of a storm, the sea surface is referred to as sea - this is a confused mosiac of waves with different characteristics. As these waves pass out of the area of generation, they sort themselves out with the longest wavelengths (and also speeds) moving away more quickly. This can be likened to the start of the Boston Marathon with runners of all capabilities eventually sorting themselves out as the race progresses. The characteristics of the waves generated are a function of three variables: fetch, duration of winds and wind speed. The sea surface becomes much smoother and there are long gentle, regular swells.
Because these types of waves are caused by winds, we would expect to see a good relationship between the global distribution of winds and waves. Also as we would expect, there are seasonal changes. In our summer, the largest waves (4-5m) are in the Southern Ocean where it is local winter. In our winter similar size waves are being generated in the North Pacific and North Atlantic. In October most of the activity in in the Southern Ocean.
Constructive and Destructive Interference - the interaction of two wave trains produced by two different storms and travelling in the same direction. Usually the result is a mixed interference because of differences in the individual wave train characteristics. If the characteristics are exactly the same they can completely cancel each other out or they can be totally additive with the same wavelength, but twice the wave height.
Surf refers to swell as it comes into shallow water. As the waves are slowed down, the wave height increases and the crests become narrow and pointed. The wavelength decreases as the inshore waves slow down and the offshore waves are still going full speed. As the wave steepness reaches 1/7 (H/L) the waves break. The energy being transmitted at sea is potential energy in that it is a deformation of the sea surface. It becomes kinetic energy when the wave breaks and matter is displaced.
Wave Refraction - the bending of waves to more or less break parallel to an irregular coastline. This causes wave energy to converge on projecting headlands and diverge in bays or estuaries. This has important biological consequences due to its influence on sediment size and wave energy.
Wave Diffraction - refers to wave bending around an object such as a barrier constructed to protect a harbor or islands. Polynesian navigators could use the diffraction patterns from islands to detect their approach to islands long before the islands could be observed any other way.
Wave Reflection - when a wave hits a sea wall it can be reflected at the angle of incidence without loss of energy. For ideal reflection the wave must hit at right angles to the reflecting surface. This produces a standing wave.
You produced these waves in lab. They are characterized by a node and an antinode. If there is only one node, it is at the center and has no vertical motion associated with it. The antinode has only vertical motion associated with it and is zero at water level. At 0.25T the motion overall is at its maximum and is completely horizontal.
Storm Surge - produced by large storms such as hurricanes in the northern hemisphere. Due to the extreme low atmospheric pressure, a hill of water forms under the center of the storm. When the storm comes ashore it can be very catastrophic, especially if it coincides with local high tides and in low-lying coastal regions. An example of this is the 1900 hurricane that hit Galveston. The residents did not evacuate and the storm surge overran the entire island with a loss of life of approximately 6,000. Once the circulation pattern is set up in a tropical storm system, it "feeds" on the energy of the warm surface waters of the tropical ocean. As the warm surface air is sucked in toward the eye it is deflected to the right due to the Coriolis effect, producing the counterclockwise circulation. As it reaches the eye and it moves upward, cools and produces rain which releases the latent heat of evaporation. The energy produced by a single hurricane is greater than all the energy produced in the United States in the last 20 years. An atomic bomb triggered in the eye of the hurricane would have no effect, but to be sucked up and distributed throughout the system.
TSUNAMIS
Althought these are commonly called tidal waves, they have nothing to do with tides. The are more properly called seismic sea waves. They are caused by a fault movment such as a subsidence of a large area of sea floor. This causes a corresponding change in the sea level above the faulting area. The water rushes in toward the center. It meets in the center and rushes outward in concentric rings. These waves are much more common in the Pacific because of its ring of trenches.
The wavelength of tsunamis typically exceed 200km so it is a shallow water wave. This means its speed is determined by water depth according to the above equation. Speeds are usually in excess of 700km/hr with wave heights of about 0.5m. This means they are not obserable in the open ocean. When they reach shallow water, they slow down and water piles up. The crests of these waves can reach 30m and they have tremendous destructive power.
A major tsunami occurred in 1883 when the island of Krakatoa in the Sunda Strait, exploded and disappeared. The sound of the explosion was heard 4800km away and the volcanic dust injected into the atmosphere produced spectacular sunset around the world for a year. The tsunami generated a wave of 30m in coastal areas and more than 36,000 people died.
One can only imagine the tsunami that was generated by the asteroid impact that created the 180km crater at Chicxulub. It must have had catastrophic effects in the Gulf of Mexico and the Atlantic Ocean. A tsunami warning system was established in 1948 to monitor seismic events and evaluate their potential for producing a tsunami. Once detected, warnings are sent to all the coastal regions that might receive a destructive wave and a predicted time of arrival.
INTERNAL WAVES
These waves occur along the pycnocline and are thought to be generated by underwater avalanches or other mechanisms which put energy into the system. The important parameter here is the density difference between the water layers. The smaller the difference, the greater the wave height that can be maintained. They may have wave heights above 100m, with periods of 5-8m and wavelengths of 0.6-0.9km. There are surface manifestations of internal waves that can be observed in sunglint, as waves of 50m wavelengths, or with 4.5km wavelengths, as waves that mirror underwater topography, such as a submarine canyons or in other shapes enhanced, coastlines, or eddies). This makes them shallow water waves.
This type of wave may have been responsible the the loss of the THRESHER in 1963, carrying it below its rated depth. Our lack of understanding of internal waves was somewhat apparent in our difficulty in producing them in the wave lab.
POWER FROM WAVES
Although there have been many ideas put forth to harness energy from waves, none have yet been developed beyond the pilot stage. Coastal installations, while close to the consumers, could have major effects on coastal processes such as sediment transport. Open ocean systems would be distant from consumers and would need to be anchored in considerable depths in some locations. A lot of engineering design needs to be done and the cost of generation from more conventional sources needs to increase before this is a viable option.
Its the same reason we don't fall off the planet, the same reason there is wind in the sky, the same source of the movement from within the earth and inside your soul. It is the magical everlasting flow of energy that sustains life. Without the currents and waves many lifeforms would perish, its sacred and you are wise to ponder on such things, just remember the scientific answer isn't always the one you want!
because they don't work as well on land
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A question or 2 about dreams?
Is it ok to do the wrong thing for the right reasons?
What is it with bouncers and there homosexual tendencies ?
Answers:
ask the moon
Its just friendly, the sea waves to everybody
i think it is something to do with the moon
Waves are almost wholly the result of the wind blowing across the surface of the water.
Fill a drinking glass with water, then at an angle 0f about 35 degrees blow on it - you will observe that the surface of the water ripples. That is what the wind does to vast expanses of water called Oceans and seas. That is how waves are formed - the wind creates them.
The moons gravitational pull has an effect. If the mood disappeared there would be chaos and loads of floods.
This is due to the Rotation of the earth around itself and rotation of moon around the earth.
there are many factors why sea creates wave, the wind, the movement of the earth to the sun, the gravitational pull of the moon, the heat and cold, the gravity of the earth, etc,.
Waves are generated by a number of things. One of them is the currents, where oceanic currents affect the movement of the water and this has a rippling effect. The closer the resultant ripples get to the coastline where the water is typically shallower, the larger the ripples and this is witnessed as waves.
Another generator of waves is tides. As the tides rise and fall, the body of water moves and creates ripples and waves.
Wind also creates waves. The movement of air disturbs the surface of water and this results in ripples. Accumulatively over many miles the magnitude of the waves gets larger, and again, where the water gets shallower near the coast, the waves gain amplitude (size).
Movements in the earth's crust under the sea also creates waves. This is what a tsunami is - large waves created by sudden movements in the earth's surface under the sea, typically by way of earthquakes. Other tremors, and underwater volcanoes also can have the same effect. Also, earthquakes with an epicenter on land but close to the sea can also result in large waves. A resultant collapse of land mass can create huge waves, such as that caused by the collapse of one side of Mt. St. Helena when it erupted.
Because of the Moon
the moon and wind
the are created by the Ebb and Flow of the tides amongst other things like the weather
They are caused by the gravitational pull the moon causes on earth, and the strength or lack of ferocity of the wind determines the size and strength of them.
Boaz.
Muslim terrorists cause them.
For the same reason that my pubes are curly
Waves found in the ocean have different causes and, therefore, different characteristics. At the surface of the ocean, waves can be generated by the action of wind blowing across the surface, by earthquakes beneath the surface of the ocean, by changes in atmospheric pressure or along its shores or by the gravitational attraction of the sun and moon. Normally these waves transmit energy only, not matter.
Progressive waves show both longitudinal (back and forth) movement and transverse (right angle) movement. This resultant is called orbital movement.
If we observe waves from a fixed point we see troughs and crest passing by. The distance fromm successive crests or troughs is called the wavelength (L). The time interval for the passage of one wavelength is called the period (T). If we know either one, the other can be calculated from the equation because the theoretical relationship is known -
L = 1.56T2:
Speed (S) = L/T = 156m/10s = 15.6m/s
Wave Steepness = H/L
Frequency (f) is the number of wavelengths that pass a fixed point per unit of time:
f = 1/T
for the previous example S = Lf = 156m x 6/min = 936m/min
936m/min x 1min/60s = 15.6m/s
Wind-generated waves can be divided into deep water waves and shallow water waves and transition or intermediate-depth waves. If the depth of the water is greater than L/2 the wave is a deep water wave., For the previous example the wave is a deep water wave as long as the bottom depth is greater than 78m. In deep water waves the movement of an individual water particle is orbital (circular), moving forward with the crest and backward with the trough.
Deep-Water Waves
S = (gT)/(2*pi) = [9.8(m/sec*sec) * T (s)]/2*3.14 = 1.56T(m/sec)
Shallow-Water Waves
When d< L/20 waves are classified as shallow-water waves. They include wind-generated waves as they move into shallow water, tsunamis (seismic sea waves) and the tides generated by gravitational attraction of the sun and moon. For these waves: S (m/s) = sqrt(gD)= 3.1 sqrt(D) Particle motion is shallow-water waves is a flattened ellipse and becomes more horizontal as depth increases. This horizontal motion affects the bottom (as you saw in the lab on waves when you created ripple marks. What about those waves that fall between L/20 L/2?
Transitional or Intermediate-depth Waves
The speed of these waves is determined partially by wavelength and partially by water depth.
Distribution of Wave Energy
Spectral analysis of a wide range of various kinds of waves show the principal generating forces, the principal restoring forces and the energy peaks.
As wind blows across a dead calm sea, capillary waves with rounded crests and V-shaped troughs and wavelengths <1.74cm form. The principal restoring force is surface tension. As more energy is transferred, gravity waves are formed. These have the more typical sine-shaped cross section. If the wind blows long enough, an equilibrium is reached where the wave speed equals the wind speed. This is unusual. Typically we see what is called a >fully developed sea.
In an area of a storm, the sea surface is referred to as sea - this is a confused mosiac of waves with different characteristics. As these waves pass out of the area of generation, they sort themselves out with the longest wavelengths (and also speeds) moving away more quickly. This can be likened to the start of the Boston Marathon with runners of all capabilities eventually sorting themselves out as the race progresses. The characteristics of the waves generated are a function of three variables: fetch, duration of winds and wind speed. The sea surface becomes much smoother and there are long gentle, regular swells.
Because these types of waves are caused by winds, we would expect to see a good relationship between the global distribution of winds and waves. Also as we would expect, there are seasonal changes. In our summer, the largest waves (4-5m) are in the Southern Ocean where it is local winter. In our winter similar size waves are being generated in the North Pacific and North Atlantic. In October most of the activity in in the Southern Ocean.
Constructive and Destructive Interference - the interaction of two wave trains produced by two different storms and travelling in the same direction. Usually the result is a mixed interference because of differences in the individual wave train characteristics. If the characteristics are exactly the same they can completely cancel each other out or they can be totally additive with the same wavelength, but twice the wave height.
Surf refers to swell as it comes into shallow water. As the waves are slowed down, the wave height increases and the crests become narrow and pointed. The wavelength decreases as the inshore waves slow down and the offshore waves are still going full speed. As the wave steepness reaches 1/7 (H/L) the waves break. The energy being transmitted at sea is potential energy in that it is a deformation of the sea surface. It becomes kinetic energy when the wave breaks and matter is displaced.
Wave Refraction - the bending of waves to more or less break parallel to an irregular coastline. This causes wave energy to converge on projecting headlands and diverge in bays or estuaries. This has important biological consequences due to its influence on sediment size and wave energy.
Wave Diffraction - refers to wave bending around an object such as a barrier constructed to protect a harbor or islands. Polynesian navigators could use the diffraction patterns from islands to detect their approach to islands long before the islands could be observed any other way.
Wave Reflection - when a wave hits a sea wall it can be reflected at the angle of incidence without loss of energy. For ideal reflection the wave must hit at right angles to the reflecting surface. This produces a standing wave.
You produced these waves in lab. They are characterized by a node and an antinode. If there is only one node, it is at the center and has no vertical motion associated with it. The antinode has only vertical motion associated with it and is zero at water level. At 0.25T the motion overall is at its maximum and is completely horizontal.
Storm Surge - produced by large storms such as hurricanes in the northern hemisphere. Due to the extreme low atmospheric pressure, a hill of water forms under the center of the storm. When the storm comes ashore it can be very catastrophic, especially if it coincides with local high tides and in low-lying coastal regions. An example of this is the 1900 hurricane that hit Galveston. The residents did not evacuate and the storm surge overran the entire island with a loss of life of approximately 6,000. Once the circulation pattern is set up in a tropical storm system, it "feeds" on the energy of the warm surface waters of the tropical ocean. As the warm surface air is sucked in toward the eye it is deflected to the right due to the Coriolis effect, producing the counterclockwise circulation. As it reaches the eye and it moves upward, cools and produces rain which releases the latent heat of evaporation. The energy produced by a single hurricane is greater than all the energy produced in the United States in the last 20 years. An atomic bomb triggered in the eye of the hurricane would have no effect, but to be sucked up and distributed throughout the system.
TSUNAMIS
Althought these are commonly called tidal waves, they have nothing to do with tides. The are more properly called seismic sea waves. They are caused by a fault movment such as a subsidence of a large area of sea floor. This causes a corresponding change in the sea level above the faulting area. The water rushes in toward the center. It meets in the center and rushes outward in concentric rings. These waves are much more common in the Pacific because of its ring of trenches.
The wavelength of tsunamis typically exceed 200km so it is a shallow water wave. This means its speed is determined by water depth according to the above equation. Speeds are usually in excess of 700km/hr with wave heights of about 0.5m. This means they are not obserable in the open ocean. When they reach shallow water, they slow down and water piles up. The crests of these waves can reach 30m and they have tremendous destructive power.
A major tsunami occurred in 1883 when the island of Krakatoa in the Sunda Strait, exploded and disappeared. The sound of the explosion was heard 4800km away and the volcanic dust injected into the atmosphere produced spectacular sunset around the world for a year. The tsunami generated a wave of 30m in coastal areas and more than 36,000 people died.
One can only imagine the tsunami that was generated by the asteroid impact that created the 180km crater at Chicxulub. It must have had catastrophic effects in the Gulf of Mexico and the Atlantic Ocean. A tsunami warning system was established in 1948 to monitor seismic events and evaluate their potential for producing a tsunami. Once detected, warnings are sent to all the coastal regions that might receive a destructive wave and a predicted time of arrival.
INTERNAL WAVES
These waves occur along the pycnocline and are thought to be generated by underwater avalanches or other mechanisms which put energy into the system. The important parameter here is the density difference between the water layers. The smaller the difference, the greater the wave height that can be maintained. They may have wave heights above 100m, with periods of 5-8m and wavelengths of 0.6-0.9km. There are surface manifestations of internal waves that can be observed in sunglint, as waves of 50m wavelengths, or with 4.5km wavelengths, as waves that mirror underwater topography, such as a submarine canyons or in other shapes enhanced, coastlines, or eddies). This makes them shallow water waves.
This type of wave may have been responsible the the loss of the THRESHER in 1963, carrying it below its rated depth. Our lack of understanding of internal waves was somewhat apparent in our difficulty in producing them in the wave lab.
POWER FROM WAVES
Although there have been many ideas put forth to harness energy from waves, none have yet been developed beyond the pilot stage. Coastal installations, while close to the consumers, could have major effects on coastal processes such as sediment transport. Open ocean systems would be distant from consumers and would need to be anchored in considerable depths in some locations. A lot of engineering design needs to be done and the cost of generation from more conventional sources needs to increase before this is a viable option.
Its the same reason we don't fall off the planet, the same reason there is wind in the sky, the same source of the movement from within the earth and inside your soul. It is the magical everlasting flow of energy that sustains life. Without the currents and waves many lifeforms would perish, its sacred and you are wise to ponder on such things, just remember the scientific answer isn't always the one you want!
because they don't work as well on land
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