Big Waves Rising Faster than Sea Level

Photo by Mila Zinkova, courtesy Wikimedia Commons

Fight disinformation. Get a daily recap of the facts that matter. Sign up for the free Mother Jones newsletter.


The biggest waves in the Pacific Northwest are getting bigger. So are the smaller waves.

A new assessment of offshore data from Oregon and Washington finds the annual average heights of deep-water waves have increased since the mid-1970s—with both the low waves of summer and the highest storms waves of winter growing yearly.

Consequently the 100 year wave for this region just grew form a 33-foot wave to a 46-foot wave: a 40 percent rise. Furthermore, the really highest waves possible in the 100-year-event cycle are likely to rise above 55 feet, according to research published in Coastal Engineering.

Worse, the impacts of these storm waves will dwarf the impacts expected from sea level rise in coming decades.

I wrote about this phenomenon in MoJo’s All the Disappearing Islands in regards to the people of the Pacific islands nation of Tuvalu. Long before they’re actually drowned, low-lying islands and coastlines will become uninhabitable from periodic inundation by storm waves.

In the Pacific Northwest, increasing wave heights have already wrought three times more havoc from erosion, flooding, and coastal damage than is expected from sea level rise in the next few decades.

Add sea level rise to growing wave heights you get a seriously accelerated impact on coastlines.

The most likely cause? Global climate change, say the researchers—who note similarly rising wave heights in the North Atlantic, plus a rising in the total power generated by hurricanes yearly.

So for those who think a 1.5-degree F global temperature rise is inconsequential, here are a few of the deadly inconsequences.
 

HERE ARE THE FACTS:

Our fall fundraising drive is off to a rough start, and we very much need to raise $250,000 in the next couple of weeks. If you value the journalism you get from Mother Jones, please help us do it with a donation today.

As we wrote over the summer, traffic has been down at Mother Jones and a lot of sites with many people thinking news is less important now that Donald Trump is no longer president. But if you're reading this, you're not one of those people, and we're hoping we can rally support from folks like you who really get why our reporting matters right now. And that's how it's always worked: For 45 years now, a relatively small group of readers (compared to everyone we reach) who pitch in from time to time has allowed Mother Jones to do the type of journalism the moment demands and keep it free for everyone else.

Please pitch in with a donation during our fall fundraising drive if you can. We can't afford to come up short, and there's still a long way to go by November 5.

payment methods

ONE MORE QUICK THING:

Our fall fundraising drive is off to a rough start, and we very much need to raise $250,000 in the next couple of weeks. If you value the journalism you get from Mother Jones, please help us do it with a donation today.

As we wrote over the summer, traffic has been down at Mother Jones and a lot of sites with many people thinking news is less important now that Donald Trump is no longer president. But if you're reading this, you're not one of those people, and we're hoping we can rally support from folks like you who really get why our reporting matters right now. And that's how it's always worked: For 45 years now, a relatively small group of readers (compared to everyone we reach) who pitch in from time to time has allowed Mother Jones to do the type of journalism the moment demands and keep it free for everyone else.

Please pitch in with a donation during our fall fundraising drive if you can. We can't afford to come up short, and there's still a long way to go by November 5.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate