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Depth of the river – the river must be shallow, the estuary (place where the freshwater river meets the saltwater sea) must be wide and flat.

Wind direction – The tidal bore will be smaller is it is flowing against a strong wind due to the effect of air pressure on the water.

The development of tidal bores depends on a number of factors: The formation of Tidal Bore The formation of tidal bore against the river current.

Bono, Kampar River, at Meranti Bay, Pelalawan, Indonesia.

Batang Sadong or Sadong River, Sarawak, Malaysia.

Batang Lupar or Lupar River, near Sri Aman, Malaysia.

Ganges–Brahmaputra, India and Bangladesh.

There are few rivers in Asia that tidal bore known to exist.

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The tidal bore happens during the spring tide with every full moon, strongest in the fall.

The world’s largest tidal bore occurs along the Qiantang River in Hangzhou, China, where tides reach up to 30 feet and travel at up to 40 kilometers per hour. Benak at Batang Lupar Sarawak while others happens during spring tides (Tides are strongest during new moons and full moons), e.g. Tidal Bore are less predictable than Sea Tides. It is seen as a rapid rise in tide with advancing water forms a abrupt front.Īll famous tidal around the world have their unique names: The sea level is highest at the equator than the poles due to earth rotation.Ī tidal bore is a rare natural phenomenon in which an incoming tide creates a wave of water that travels up along a river or a narrow bay causing water to flow against the river’s current.

This effect on land mass also affects the sea level. The spin of the earth makes earth a oblate spheroid with flatter poles and bulging equator. The sea level will be the highest (spring tides) when the pull of the moon and the sun are in line (at new and full moon) The relative location of the Sun, the Moon and the Earth will cause the water to raise and fall accordingly. when the sun and the moon are at an right angle, it creates a neap tide (lowest tide range between high and low tide)

When the sun and the moon gravitational pull are in line, it creates a spring tide (highest tide). However due to its distance from the Earth, and the Earth have its own gravitational pull which is closer and stronger in relative to the sun, the Earth water is not pull into the sun.Įarth have a moon which also have gravitational pull on the earth water which acts similarly. The Sun is the largest and heaviest planet in the solar system, it have its gravitational pull on all the other planets and asteroids so that all move steadily around it.

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Like a bowl of round beads, tilting the bowl will make the free moving beads to responds and move towards a greater force acting on it – the gravity.Įvery object with mass will exist a gravity interaction with nearby mass. It is important to understand that water is actually a “loose” body and it flows freely in response to a force. This creates a predictable “time table” for a raising tide or receding tide. Tides are mainly caused by the combining gravitational pull of the sun and the moon in relation to forces created by the spin of the earth. Along parts of the Atlantic and Pacific coasts their rise and fall can be extreme. In the Mediterranean the tides are small. In different places, sea level changes differently. It can vary from time to time, and usually affected by various factors such as the gravitational pull from the significant planet body like the sun and the moon, the atmospheric pressure systems, the current direction of the ocean, the underlying bathymetry of the ocean floor and the rotation of the earth itself. The Sun, The Moon, The Earth and The TideĪll around the world the sea level rises and falls every day with the tides. Not all coast have a tidal bore, lets find out how this tidal bore is unique and how it is formed.Īnyway the Tidal Bore festival is just around the corner, welcome to the humble town of Sri Aman to witness the grand festival on November 3rd to 5th 2017. Lets surf the Benak at the Legendary Batang Lupar River ! Feel the Wave ! Feel the Splash ! “Benak” is the native tongue for tidal bore in Sarawak.

Sarawak river