7 days roughly A spring tide occurs when the sun, moon, and earth are all in alignment. The forces are not aligned when they are at right angles: neap tide. It takes around 7 days to transition from spring to NEAP. Spring and neap tides occur every 6 hours and 49 minutes.
During a spring tide, the rising and falling waters align with the position of the moon and sun, creating high and low tides each day. During a neap tide, the positions of the moon and sun are at right angles to the rise and fall of the water, so there is no high or low tide.
The amount of water on Earth's surface changes constantly due to oceanic processes such as erosion, deposition, and water evaporation. At any given moment, some places have more water than others - this is known as an oceanic front. There are two types of oceanic fronts: coastal and continental. A coastlines consist of beaches, dunes, cliffs, etc., while a continent is any land mass larger than a continent, such as Africa or Australia. Coasts are more common than continents; there are more miles of coastline than of continental shelf. An example of a continent-sized area covered in water is an ice age valley basin that receives little sunlight.
A neap tide (seven days following a spring tide) is a period of mild tides caused by the sun and moon being at right angles to each other. At mid-month, when the moon is at its greatest distance from the earth, neap tides are about 20 percent lower than at full moon when it is closest.
At first glance it might seem that neap tides would last for seven days, but this is not true; instead, they last for only three or four days. The reason is that after the first night there is no new moon so there can be no more neap tides.
It's easy to remember: neap tides come every three or four days at most lunar months.
Lunar months vary between 29 and 30 days depending on where you are on Earth. Because of this variation, neap tides do not always come at exactly three or four weeks but sometimes two or five days before or after this average time.
For example, if you live in New York City, then lunar months are usually given as 29 or 30 days because of the influence of the moon on the tides. However, if you visit Lisbon during a full moon, then the lunar month is calculated as 31 days because there will be 14 nights with full moons.
Ideally, the duration between a low and a subsequent high should be little longer than 6 hours. The time difference between spring tide and neap tide is usually 7 days and is determined by the phases of the moon. However, due to factors such as ocean currents and weather conditions, this period can vary significantly from 7 days to more than 10 days.
The average length of a spring tide is about 3 to 4 hours. But because tides are influenced by many factors beyond just the phase of the moon, these lengths can vary greatly. Tides can be higher or lower, longer or shorter than their average level. Spring tides often cause flooding or erosion where they reach high water, such as along shoreline beaches. They can also cause marshes and other wetlands to overflow their banks.
During a spring tide, the highest water levels occur about three hours after new moon and three hours before full moon. So, on average, you need to allow for around three hours of high water for every hour of low water. For example, if one were to walk along a beach during a spring tide, it would be best to do so between midnight and 3 AM since that is when the high waters are expected to be reached.
You cannot accurately predict when or where a spring tide will occur. However, scientists do know that they tend to cluster together over time and space.
Tides rise to a maximum and fall to a minimum twice a month due to the spring-neap cycle. Spring tides occur one to two days following the new or full moon due to the regularity of astronomical forces mixed with the geometry and friction of the actual seas. Neap tides follow about three days after the new or full moon because Earth's rotation is not exactly uniform.
These tides travel across the globe, affecting every land mass as well as ocean. The highest tide anywhere on Earth can be found at Jupiter's North Pole! It reaches 30 miles high but falls away rapidly, while the lowest point on Earth is in the middle of the South Atlantic Ocean, 830 miles from South Africa. This bottom point rises only 2 miles but stays there for over 200 years.
The average height of the water above this low point varies slightly around the world, but is usually between 3 and 4 feet.
At first glance it might seem that since the height of the water changes from place to place that there would be no way to have a constant level surface like the sea. But thanks to the action of wind and water erosion, beaches are constantly changing shape and size. Where once may have been a flat shoreline now be a headland, or cliff.
Neap tides occur when the moon's gravitational attraction is perpendicular to the sun's gravitational force. A month is animated in the graphic above. Every month, we can observe that there are around two spring tides and two neap tides, with about a week in between. The height of the water varies significantly between high tides and low tides.
At spring tides, the ocean is at its highest peak. At low tides, the ocean is at its lowest point. The difference between high and low tides is called the tide range.
The frequency of high and low tides depends on the distance of the moon from the earth. If the moon was at its closest position to the earth, then it would pass completely over the center of the planet every 28 days and there would be no net change in sea level. However, because it does not quite reach the center, the moon creates two different levels of the ocean: one when the moon is full and one when it is empty. These are known as high and low tides, respectively. The amount of water fluctuating up and down is called the tide pool. High and low tides come about once a month, but the amplitude of these tides is greatest at spring tides.
Tides are driven by the interaction of gravity with objects below the surface of the Earth.
Despite its name, spring tides occur all year, not only in the spring. They occur anytime the moon is in a new-moon or full-moon phase, or roughly every 14 days. Neap tides have the shortest tidal range and occur when the Earth, Moon, and Sun make a 90-degree angle. The water level at low tide is about 5 feet lower than at high tide.
Holidays and meteorological conditions can also influence the range of neap tides. For example, if a storm causes large waves they will rise above the normal high-tide line and flood coastal areas behind the wave front. These areas typically receive no rain but do get flooded by seawater. Such floods can cause considerable damage to homes and businesses. Storms that generate waves this far out to sea are called tropical storms or hurricanes.
The range of neap tides is about 10 feet, so it is less than half that of spring tides. This means that near shore there is less fluctuation in water level with each cycle of the moon. Spring tides occur once every 12 months, while neap tides occur once every 4 weeks.
This depends on which part of the world you are talking about.