22 December 2021

Linkage

Today in "Too Much Free Time", we have this:

1 comments :

The Red Alias said...

Most of California's central valley is at or near sea level.

With a 3' increase in sea level, it will revert to swamp. (The inland port city of Stockton, immortalized in the TV series, "The Big Valley" was previously called "Tuleburg", for the cattails that grew in the swamp.)

Japanese farmers moved in and turned swamp into rice paddies. Roosevelt's concentra- I mean, Relocation Camps stole land from the Japanese farmers, and sold it cheap to cattle ranchers. Developers moved in in the 1960s, drained the paddies with a web of sloughs, and we moved to one of those developments in 1974.

This amount of sea level rise (more than three feet) will overwhelm the levees and put much of Stockton, and the valley, under water.

It's a prime agricultural area for the nation.

Salt infiltration from sea water will poison the land and turn it into a shallow inland sea within our lifetimes.

Assuming we live another 20 years.

No agriculture. No Sacramento River. No towns, from Sacramento to Bakersfield. Just hot, humid, mosquito-infested marshland. It gets over 110 degrees in summer. Add a shallow body of water to that baking sun, and you'll get crazy amounts of water evaporating and piling up against the Sierras, with nowhere to go but back down into the swamp, as runoff, and massive T-storms.

They designed the I-5 freeway as a 20' high dike to keep back the ocean, but even a small quake in that 3,000' deep sedimentary layer on the valley floor will liquefy the soil, and magnify the shaking.

We are about 100 years overdue for major quakes on the San Andreas and Hayward Faults. No dike can withstand an 8 magnitude quake on sandy, muddy soils.

(In another life, I studied California's seismic history. We used to have major quakes at 60 and 80 year intervals. By comparison, the 1989 Loma Prieta quake was a hiccup.)

There will be beachfront property in the Sierra and Coastal Range foothills, but the beaches will be toxic, from submerged gas stations, Superfund sites, and whole drowned cities on the new sea floor. River flows are not adequate to flush out toxics.

What shall we call California's new inland sea? Lake Hubris?

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