California
Related: About this forumCalifornia will face a terrible choice: Save cliff-side homes or public beaches from rising seas
Washington Post / July 12, 2018
Like an ax slowly chopping at the trunk of a massive tree, waves driven by sea-level rise will hack away the base of cliffs on the Southern California coast at an accelerated pace, a recent study says, increasing land erosion that could topple some bluffs and thousands of homes sitting atop them.
California officials from Santa Barbara to San Diego will face an awful choice as the sea rises, the U.S. Geological Survey study says: save public beaches enjoyed by millions, or close them off with boulders and concrete walls to armor the shore and stop the waves in a bid to save homes.
The study predicts coastal land loss on an unimaginable scale over the remaining century, up to 135 feet beyond the existing shoreline. For the highest sea-level rise scenario, taking an average cliff height of more than 25 meters, the total cliff volume loss would be more than 300 million meters by 2100, it says.
One of the studys authors, Patrick Barnard, a USGS research geologist, tried to explain the issue in a way that laypeople can understand. Its a huge volume of material, he said. We place this in a context of dump truck loads. It would be 30 million dump trucks full of material that will be eroded from the cliffs. The trucks would stretch around the globe multiple times, he said.
More: https://www.washingtonpost.com/news/speaking-of-science/wp/2018/07/11/california-will-have-a-terrible-choice-save-cliff-side-homes-or-public-beaches-from-rising-seas/?utm_term=.81b99b217eff
CAPTION: Homes along the edge of the coast in Santa Barbara County, Calif., in 2005. (Patrick Barnard/Pacific Coastal and Marine Science Center/U.S. Geological Survey)
riversedge
(70,094 posts)lapfog_1
(29,194 posts)with sea walls and boulders and such has been proven to be ineffective in the long term
The ocean simply used up the wave action energy in excavating underneath the obstacles.
So... you might save the cliffs (and the homes) for a time... but eventually nature will win.
msongs
(67,369 posts)Demovictory9
(32,423 posts)BigmanPigman
(51,570 posts)Whether it is in an earthquake zone, a flood zone, a wild fire area, etc. They see their homes destroyed and they choose to rebuild. Sometimes they do not but only when they can not get insurance or the local govt has stepped in for their own safety.