The movement of waves is called oscillation, which refers to the repeating back-and-forth or up-and-down motion of the wave as it travels through a medium.
Waves that move up and down are called transverse waves. In transverse waves, the wave energy travels perpendicular to the direction of the particle displacement. Examples include light waves and water waves.
The back and forth up and down motion of a wave is called oscillation. This motion involves the movement of particles or energy in a repeated pattern around a central point. oscillation can be seen in various natural phenomena such as sound waves, light waves, and water waves.
Transverse waves move up and down or perpendicular to the direction of the wave's movement. Examples include light waves, water waves, and electromagnetic waves.
Transverse waves have movement that is perpendicular to the direction of the wave's propagation. This means that the particles of the medium oscillate up and down or side to side as the wave moves forward. Examples of transverse waves include electromagnetic waves (such as light) and some seismic waves.
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The movement of waves is called oscillation, which refers to the repeating back-and-forth or up-and-down motion of the wave as it travels through a medium.
Longshore Drift
Longshore drift is the movement of water and sediment along a beach caused by waves approaching the shore at an angle. This process causes sediment to be transported parallel to the shoreline, leading to the creation of sandbars and beaches.
continuous manner due to the action of waves and currents. It is a natural process that helps redistribute sand along the coastline and maintain the beach's shape and size.
Waves that move up and down are called transverse waves. In transverse waves, the wave energy travels perpendicular to the direction of the particle displacement. Examples include light waves and water waves.
waves
Swash is movement of water up the beach whereas backswash is movement of water down the beach.
The back and forth up and down motion of a wave is called oscillation. This motion involves the movement of particles or energy in a repeated pattern around a central point. oscillation can be seen in various natural phenomena such as sound waves, light waves, and water waves.
longshore currents are common at any beach that is exposed to breaking surf. A longshore current is an ocean current that moves parallel to shore. It is caused by large swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction. Longsshore currents usually extend from the shallow waters inside the breaking waves to breaking waves on the outside. They vary depending on the size, strength, and direction of the approaching swell, and the length of the beach. The more prominent the swell size and direction, and the longer and straighter the beach is, the more powerful and swift the long-shore current will be. They are responsible for many rescues along the coast by sweeping swimmers and surfers down the beach into a variety of hazards. They also have a large inpact on the shorelineA shoreline is not static. As waves appoach shore and "feel the bottom", water piles up and breakers form (see "Waves"). Primarily these waves, breaking at an angle to the shoreline, are what generate a "longshore current" that parallels the shore. Importantly, the longshore current not only moves water in the surf zone, it also moves sediment parallel to the shoreline. Figure 1 illustrates that the direction of longshore current is a function of the angle of wave appoach. For example, if the waves appoach the shoreline from the south, longshore current moves from south to north.But longshore current and the resulting transport of sediment is only one of the dynamic processes that constantly alter the shoreline. As waves repeatedly hit the shore, water moves onto the beach and then retreats in a continuous cycle. However, the waves are not all that moves on the shoreline. In fact, the sediment on the shore is also always on the move. Great energy is expended on the beach as waves crash against the shoreline. This energy allows the water to transport sediment. The grains are lifted as the waves in the swash zone move onto the beach, and then the grains are deposited again as the water retreats. As long as the waves hit the shoreline "straight on" (i.e., the wave crests are parallel to the shoreline), the sand grains will be picked up and redeposited in the same general area. In this case, no real net movement of sand occurs in the swash zone. However, waves generally do not form parallel to the shoreline, and thus, usually approach the shore at an angle. Consequently, beach sand will have a net movement up or down the beach, depending on the direction of incoming waves. This net movement of the beach sand is known as beach drift.Figure 2 illustrates how beach drift operates. Notice on the diagram the angle at which the waves hit the beach. The water moves onto the beach close to the same angle. Recall that sand grains are transported as the waves move onto the beach. Therefore, the sand grains are being carried in the same direction that the waves are moving. However, when the water retreats, due to gravity it goes straight back perpendicular to the shoreline and not back in the opposite direction from which it came. Since grains are redeposited as the water retreats, the grains are actually deposited further down the beach or down longshore current. Hence, the net overall movement of sand is down current. Also, notice on the diagram that at a given point on the beach, the sediment that has moved down shore is replaced by sediment from further up shore, as long as sediment is available there. The net movement of sediment in Figure 2 is to the south because the waves are hitting the shore from the north. If the waves hit the beach from the south, the net movement of sand will be to the north. Net beach sediment movement, or beach drift, can change back and forth with shifts in wave direction. However, along any particular shoreline one direction for incoming waves usually dominates resulting in a preferential net movement of sediment. Sediment transported by beach drift as well as that moved by longshore current together are called littoral transport.Why are longshore currents dangerous?Long-shore currents can sweep swimmers and surfers into rip currents, piers, jetties, and other hazardous areas. In many cases, the long-shore current is strong enough to prevent swimmers from being able to keep their feet on the bottom, making it difficult to return to shore.
Material can be transported along a beach via longshore drift;Waves approach beach at an angleMaterial is pushed up the beach by the swash in the same direction as the wave approachAs the water runs back down the beach the backwash drags material down at right angles to the beach lineOver a period of time sediment moves in this zig-zag fashion down the coast.Material can also be transported along a beach at low tide when the sand dries out by the wind (usually forming sand dunes)Material may also be transported up and down a beach by attrition. Waves may have fairly high energy so will pick up material and may loose energy further up the beach and therefore deposit it there.Might also be moved by saltation (waves carry slightly smaller sediment in the same way as attrition)Waves may be swash-aligned (waves hit beach straigt on, so sediment moved up and down beach) or drift-aligned (waves hit beach at right angles causing longshore drift)
A constructive wave is a powerful wave that surges up the beach with a powerful swash. This is the forward movement of the wave up the beach. It has a weak backwash, which is the backward movement of water down a beach when a wave has broken. Characteristics are: .swash is stronger than the backwash. .Has a low gradient. .Has low energy. .Produces gentle beach profile .Other names are: storm, surfing or plunging waves. .Typical off the SW coast of the UK.