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#subsidence

7 posts6 participants0 posts today

Gee, I was just posting about #subsidence the other day...! Different places have different reasons for it to occur, but the worst is happening in Texas -- and #BigOilAndGas extraction is part of the problem there!

Big US cities are sinking. This map shows where the problem is the worst.

by Doyle Rice

Excerpt: "How does groundwater extraction cause subsidence?

"Generally, according to a statement from Lamont-Doherty, it happens as water is withdrawn from aquifers made up of fine-grained sediments; unless the aquifer is replenished, the pore spaces formerly occupied by water can eventually collapse, leading to compaction below, and sinkage at the surface.

"In Texas, the problem is exacerbated by pumping of oil and gas, the study says."

usatoday.com/story/news/nation

USA TODAY · Big US cities are sinking. This map shows where the problem is the worst.By , USA TODAY
Replied in thread

@maggiejk It's happening in Florida as well... #subsidence is the culprit in both situations.

About 3 dozen high-rise buildings in South #Florida are sinking, a study finds

December 19, 2024

SUNNY ISLES BEACH, Fla. — "Almost three dozen high-rise condos and luxury hotels along the beach in South Florida are sinking or settling in unexpected ways, in some cases because of nearby construction, according to a new study.

"The 35 buildings surveyed along an almost 12-mile stretch from #MiamiBeach to #SunnyIslesBeach have sunk or settled by 0.8 to 3.1 inches. About half of the buildings are less than a decade old, according to scientists at the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science. The study was published Friday.

" 'The discovery of the extent of subsidence hotspots along the South Florida coastline was unexpected,' Farzaneh Aziz Zanjani, the lead author, said in a statement. 'The study underscores the need for ongoing monitoring and a deeper understanding of the long-term implications for these structures.' "

npr.org/2024/12/19/g-s1-39007/

"To be over-developed is to hasten decay,
And this is against Tao,
And what is against Tao will soon cease to be." - Lao Tzu, Tao Teh Ching.

#NewYorkCity May Be Sinking Under the Weight of Its #Skyscrapers

A scientific journal suggests that the city’s 1.68 trillion pounds of buildings are causing the city to descend, in some neighborhoods faster than others.

by Tim Nelson, May 17, 2023

Excerpt: "The scholars first estimated the cumulative weight of New York’s buildings to be 1.68 trillion pounds, and then calculated the downward pressure these buildings exert on the mixture of clay, sand, and slit that make up most of the ground beneath the city’s streets.

"Based on their model, New York experiences a '#subsidence rate' (the technical term for sinking) of about one to two millimeters per year on average, though Lower Manhattan, as well as particular areas of Brooklyn and Queens, show a propensity for greater subsidence risk. As the authors note in their paper, much of lower Manhattan is currently no more than one to two meters above sea level, possibly exacerbating the effects of climate change in turn.

"While one to two millimeters per year may not seem that much, the study’s authors warn that this amount is more than enough to cause major coastal cities serious problems in the future. 'The combination of tectonic and anthropogenic subsidence, #SeaLevelRise, and increasing hurricane intensity imply an accelerating problem along coastal and riverfront areas,' the paper states. 'Repeated exposure of building foundations to salt water can corrode reinforcing steel and chemically weaken concrete, causing structural weakening.'

"As the study’s authors further point out, this level of annual collapse could potentially exacerbate the impact of #ExtremeWeather events like #HurricaneSandy, which saw sea water pour into New York."

Read more:
getpocket.com/explore/item/new

PocketNew York City May Be Sinking Under the Weight of Its SkyscrapersA scientific journal suggests that the city’s 1.68 trillion pounds of buildings are causing the city to descend, in some neighborhoods faster than others.

My April article for @forbes has a distinctly NZ flavour. It's about a new study that uses satellite radar imagery to measure land movement in NZ's coastal cities - the bad news is, in many places, it is sinking. I spoke to the lead author of the study forbes.com/sites/lauriewinkles

ForbesNew Zealand's Major Cities Are SinkingNo coastal city is immune to the impacts of sea-level rise. A new study shows that in NZ, land subsidence is accelerating the problem, putting infrastructure at risk

#subsidence

"Cities all over the world weigh so much and draw so much groundwater from beneath them that they're sinking into the ground. It's been documented on every continent.

Sinking coastal cities are extra vulnerable because the seas are rising to meet them, doubling the flood risk.

'One centimeter of sea level rise and one centimeter of subsidence each have the same effects' on flooding hazards, the lead authors of the new Miami study, Farzaneh Aziz Zanjani and Falk Amelung, told BI in an email."

web.archive.org/web/2025010109

Business Insider · Miami's sinking beach high-rises are a warning for coastal propertiesBy Morgan McFall-Johnsen

What Exactly Is The [NOAA] Sea Level Calculator And Why Would You Want To Use It?
--
coast.noaa.gov/digitalcoast/to <-- link to tool
--
“It allows you to:
👉 Understand sea level change scenarios and visualize potential impacts on a map
👉 Explore water level and flood frequency trends
👉 See the top 10 flood events for your location
👉 Determine what time of the year your community is most likely to experience a flood..”
#GIS #spatial #mapping #digitalcoast #coast #coastal #sealevel #sealevelrise #SLR #climatechange #spatialanalysis #spatiotemporal #waterlevel #flooding #flood #stormsurge #risk #hazard #planning #management #subsidence #model #modeling #tool #resource
@NOAA