Saturday, November 26, 2022

Building Bahrain

Building Bahrain
Building Bahrain
Bahrain is a small country with a big population.
Both have been growing larger in recent decades.
Since the early 1980s, the population of this island nation in the Persian Gulf has quadrupled. In 2022, it reached 1.5 million.
As population density has increased and urban development has spread, the need for land has grown.
“Like other countries in the [Persian] Gulf, rapid population growth and the simultaneous increase in urbanization, along with land scarcity, has pushed Bahrain to invest in mega land reclamation projects to extend its coastline,” said Eman Ghoneim, a physical geographer at the University of North Carolina Wilmington.
Visualization with the GeoGarage platform (UKHO raster map)
These images show changes across 35 years.
The first image was captured by the Thematic Mapper on Landsat 5 on August 17, 1987.
The second image, captured by the Operational Land Imager (OLI) on Landsat 8, shows the same area on August 17, 2022.
In 1987, Bahrain Island had just recently been linked to Saudi Arabia via the King Fahd Causeway, which opened in 1986.
In July 2022, a record 2.5 million motor vehicle passengers traveled on the 25-kilometer (16-mile) stretch of road, according to news reports.
Change is most apparent in the country’s north, where shallow coastal waters have made it technically and economically feasible to build new land from the seafloor.
Notice the areal expansion of existing islands, as well as the addition of new ones.
Sabah Aljenaid, a geographic information systems and remote sensing scientist at Arabian Gulf University, used Landsat images to classify changes to the land between 1986 and 2020.
Aljenaid and colleagues found that built-up (urban) areas dominated the changes during this period, increasing on average by 7.5 percent each year.
GB303790 ENC The Gulf - North Eastern Qatar and Ra's Tannurah(1:90,000)
BH51501B ENC  Mina' Salman and Approaches (1:12,0000)
BH51504B ENC  Approaches to Port of Sitrah (1:12,000)

The growth came primarily at the expense of vegetated land and wetlands.
Aljenaid pointed out the dramatic expansion of Muharraq Island, which now spans more than 60 square kilometers (23 square miles) northeast of Manama, the capital city.
She also pointed to changes on the island of Nabih Saleh, which has lost its agricultural areas.
While urban expansion has been focused in the north, parts of the southern coastline have undergone change, too.
Dredging for the artificial islands of Durrat Al Bahrain began in 2004; by 2007, about 5 square kilometers (2 square miles) of land had been added to Bahrain’s southeast coast.
“A decade ago, I wrote that 11 percent of the island of Bahrain is reclaimed land, and the growth continues today,” said John Burt, a marine biologist at New York University Abu Dhabi.
The shape of Bahrain in 35 more years remains to be seen.
“There was on-and-off again talk of building a bridge across Fasht Al Adhm to Qatar,” Burt said.
“It has not come to fruition, but it may be a future mega-development to watch out for.”

NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen.

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