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Ancient Alexandria is attacked by rising seas and shifting sands

Ancient Alexandria is attacked by rising seas and shifting sands

Eman Mabrouk, who lives on the ninth floor of Alexandria's Seafront, looked down from her balcony at the stripe of sand which used to be a wide beach where she had played as a young girl.

She said, "The scene is totally different now." The sea has crept nearer, the concrete barriers are longer and the surrounding buildings have cracked and moved.

A study shows that 40 of these collapse every year in Egypt's second largest city. This is up from an average of one a decade earlier.

A subtle enemy is infiltrating the foundations of the storied settlement, which has survived bombardment by British troops in 1880s and attacks by Crusaders during the 1160s.

Climate change is driving the warming of the Mediterranean waters. Researchers say that in Alexandria, this is causing coastal erosion, and saltwater seeping into the sandy substrate. This undermines buildings from beneath.

"This is the reason we see the building in Alexandria being eroded by the bottom up," Essam Heggy said, a water science at the University of Southern California.

He said that the combination of seawater rising, ground subsidence, and coastal erosion has caused Alexandria's coast to recede on average 3.5 meters a year in the last 20 years.

Heggy stated that "for many people who think that climate change is something which will happen in future and that we don't have to worry about it," it's happening right now.

Reports like "Soaring building collapses in Southern Mediterranean Coasts", published in "Earth's Future" journal, are alarming. Mabrouk's daily life has been affected by this for many years.

The building began to move and she had to leave.

"It finally got slanted." She said that after two years we all started to lean. "If you placed something on the floor, it would seem to be rolling."

BARRIERS BULLDOZERS CRACKS

Egypt's government acknowledged the problem and has promised to take action. Submerged breakwaters are used to reduce the coastal wave action, and trucks of sand are brought in to replenish sand-scarce beaches.

Ahmed Khaled Hassan said that nine concrete sea walls have been built "to protect Alexandria and the Delta from the impact rising sea levels".

Barriers stretch out into the sea in piles of geometric shapes with clear curves and straight lines that stand out against crumbling apartment blocks on land.

The authorities are trying to prevent collapses from happening by demolishing the buildings that are at risk.

On July 14, Prime Minister Mostafa Madbouly stood on a concrete barrier and told the crowd that 7500 housing units were marked for demolition, while 55,000 will be constructed.

Madbouly stated that "not a single day goes by without at least one building collapsing in part or completely," despite a demolition order.

Those who are optimistic about the impact of these measures hope that they can be effective.

"There is no danger now" "They have calculated their calculations," Shady Mostafa, the owner of a coffee shop in which he observed builders working on a barrier, said.

Some are not so sure. In a February report, Alexandria's 70 km (45 miles) of coastline was rated as the most vulnerable coastal zone in the entire Mediterranean basin.

It was estimated that 2%, or around 7,000 houses in the city, were unsafe.

Alexandria is a city that sees more and more people every day. According to Egypt's statistical agency CAPMAS, the population of Alexandria has almost doubled in 25 years to 5.8 million, swelled by tourists and workers. Trackers show that property prices continue to rise despite the risks.

The Mediterranean Sea is rising faster than other seas, in part because of the shallowness of the basin.

Ahmed al-Ashry, a 26-year-old Alexandrian, says that the causes are global, but their impacts are local.

He said, "There is a difference in the buildings and the streets."

Every now and then, we renovate buildings and within a month or so, they start to fall apart. "Our neighbours are saying the same thing: that cracks are starting to appear." Reporting by Heba Fahmy and Ahmed Fahmy, Writing by Mohamed Ezz, Editing by Andrew Heavens and Katrina Daigle

(source: Reuters)