9/7/2025–|Last update: 16:58 (Mecca time)
A recent study showed that building about 7,000 dams between 1835 and 2011 led to the movement of the two poles of the Earth by one meter in total, and caused a decrease in the level of the world sea level by 21 mm, which also contributed to climate change on the planet.
.. Andarlish of Iran the study That was seen in GeophySical Research Letters that human activities affected the planet, as these dams are combined with enough water to fill the “Grand Canyon” twice.
The “Grand Canyon” is the greatest strait in the world, and it is a groove, or a profitable valley dug by the Colorado River, located in the state of Arizona to an American, and its depth extends to about 15 thousand kilometers.
The study indicates that this polar transformation despite being slight, but it may help scientists understand how the poles move if the ice rivers and major ice sheets melted due to climate change.
“When we reserve the water behind the dams, this does not only lead to the withdrawal of water from the oceans, which leads to a global decrease in the sea level, but also distributes the mass in a different way around the world,” said Natasha Valencic, a researcher in Earth Sciences and Planets at Harvard University and the main author of the study.
“We will not enter a new ice afternoon because the Arctic moves only about a meter, but this has traces at sea level,” Flinisk added.
Valends and its colleagues in the study used a global database of dams to draw a map of the locations of each dam and the amount of water that reserves it, and analyzed how the detention of water from 6862 dams moved the ground poles between 1835 and 2011.
Their results showed that the construction of global dams caused the movements of the Earth in two distinct stages, between 1835 and 1954, many dams were built in North America and Europe, which prompted these areas towards the equator.
According to the study, the Arctic moves 20.5 centimeters towards the longitudinal line of 103 east, which passes through Russia, Mongolia, China and the Chinese Island.
From 1954 to 2011, dams have been built in East Africa and Asia, and the pole moved 57 centimeters towards the 117 -west longitudinal line, which passes through West North America and southern Pacific.
The study indicates that from 1835 to 2011, the poles moved about 113 centimeters with about 104 centimeters of movement in the 20th century.
According to the study, the World Sea level increased in the 20th century at a rate of 1.2 mm annually, but it does not happen uniformly around the world, according to Valends, who confirmed that according to the sites of dams and cabinets, the shape of the sea level rise changes, and this is another matter that must be taken into account, because these changes may be large and very important.
Radical changes
The researchers likened to the process of moving the poles by placing a piece of clay on the side of a basketball spinning, as the part that carries the clay will distract it towards the line of its level and away from the axis of its rotation, to maintain the momentum of its rotation.
And when this happens on the ground, the outer rock layer swings, different areas of the surface become directly above the rotation axis, then the geographic poles pass through different points on the surface, a process called “real polar roaming”, according to the study.
The dams also affect the climate in several ways, including increasing greenhouse gas emissions, especially methane gas, changing the carbon cycle, their effect on water temperature, and changing rainfall patterns. In addition to pollution caused by increased heavy elements concentrations.
Some studies indicate that dams represent 4% of the reasons for changing the climate caused by human activities, which causes massive floods or severe droughts.
Studies also confirm that more than 23% of the Earth’s population lost the largest part of the water resources to irrigate agricultural lands, due to the expansion of the construction of dams, while these dams benefit less than people, which represents a threat to the global ecosystem.
Some studies have claimed that the “Three Passers” Dam – the largest in the world – that China built on the Yangtisi River in Hobby, in the center of the country, slightly affects the balance and rotation of the globe.
These studies stated that more than 40 billion tons of water held by the dam can extend the duration of the day by 0.06 microscopic, and make a slight change in the shape of the earth, so that it becomes more swelling at the equator and less flat at the poles.