Hurricane Storm Surge: Double Dose of Trouble

Steve's picture

Previously, I blogged about hurricane wind hazard. Everyone knows however, that hurricanes pack a double dose of trouble -- wind and storm surge. Surge is a temporary increase of local sea level associated with the storm. In essence, the ocean turns into a river flowing inland. A disastrous prospect if you or your property stand in the way.

 Storm surge involves several components: low pressure, wind and waves. As wandering low pressure centers, hurricanes draw up the ocean in the same way that sucking on a straw draws up lemonade. Low pressure adds about a meter to surge where the pressure is lowest, close to the storm’s central eye. The drawn-up water pile travels with the storm and “splats” onto shore with hurricane landfall. A larger and more widespread contribution to surge comes from the powerful winds that circle the eye. Wind blowing over water always drags along some of the fluid below. If that wind-driven water encounters a barrier, like the coast, it “banks up” against the land, effectively increasing sea level at the shore (see the cartoon). Blow hard on your soup and it too will bank-up against the far side of the bowl. The slope of the banked-up ocean is incredibly slight -- maybe 1/100 of one degree. Still, if the winds blow long enough and strong enough, more and more water joins the bank and that 1/100 of one degree slope, extending many tens of kilometers offshore, translates to several meters of sea level rise at the coast. Finally, normal wind waves ride atop the pile compounding matters.

 


 Forecasting surge starts with forecasting hurricane pressure and wind. It’s more challenging than forecasting just peak values however; you need all the details - wind direction and strength everywhere, for the entire life of the storm. Moreover, offshore water depth and your local bathymetric conditions matter. Do I live on a bay or a straight coast? It’s easy to imagine that offshore-directed winds, weak and fast moving storms work in your favor. Needless to say, the better are your chances the higher the elevation and further away from the coast you find yourself.

 


 To calibrate their models, scientists compare computer simulations of surge with actual field measurements taken after historical hurricanes like Katrina (2005). Knock on wood that we better predict the surge hazards of the next one.

 If you’d like to get a taste of storm surge and see some “What if Katrina happened here” scenarios, take a look at this You Tube video.

 Hurricane Katrina Storm Surge Simulation

http://www.youtube.com/watch?v=S3j87m7wAik

Steven N. Ward,   Santa Cruz

 

Comments

DavidAlexander's picture

The news of Hurricane storm was very disturbing for the people. Even I was checking the reports for it regularly in the blog updates of cheap writing service. I hope there are many things which are useful from this research.

screen23's picture

Of all this is the website for hack sims freeplay online and we could get the gems and gold.

codesjunction's picture

Yep, you review that right, there are roblox hacks that could in fact offer you free robux and also I'm mosting likely to reveal you people just how you could obtain the roblox robux generator completely free.

total-robux's picture

When it comes to the world of roblox there are many fun facts that makes roblox one of the best games ever. However, one thing is certain regarding the world of roblox. The game's currency, robux, is overpriced. If you want to get lots of robux in roblox you need to pay lots of money. But there is also another way. There is a new hack for roblox that can generate over 40,000 free robux into your account each day. The process consists of sending the robux to your account while simulating the payment process. This makes the free robux 100% safe and your account totally undetectable. If you want to give this roblox hack a try you have to go the the roblox robux generator website where you need to further access the online page. Here you will be required to enter your username (no password required) and select one of the pre-defined amounts of free robux from the drop-down menu. Easy to use and effective. If the programs does not work from the first try it might because the server is overloaded. Give it another try and it will most likely work then.

jordanss123's picture

yeezy350find Thanks for sharing such a valuable informatio wqt12

staruga's picture

Actually i have no knoledge about hurricane  and hurricane wind.But now i have too much curiosity hurricane.And i think its for you and your wonderful blog.

Thank you!

Me@ ugagamestore

kateymartin's picture

The most risky element of a hurricane is the hurricane surge. A storm surge form of like a tsunami. It a nearby rise within the ocean waters caused by the essay help – Essayhelpdeal.co.uk sturdy winds close to the attention of the hurricane and, to the lesser extent, the low stress close to the middle of the storm. So that you could rather be on higher floor if you are in the course of the hurricane surge and no longer underground where you'll be trapped via the water dashing ashore and flooding the vicinity. It's miles this sudden surge or water coming ashore that is taken into consideration to be the maximum risky and negative a part of a storm.

yahyah's picture

Thanks for sharing this information. I really like your blog post very much. You have really shared a informative and interesting blog post with people.

transformice pirata

kakakakaaa's picture

Explore the endless possibilities of Roblox with our free Robux generator that will change the way you play the game forever. roblox hack

steve7876's picture

Hello,

  It should be like that. Thank you always follow this site, printing hopefully always update regular to add my insight

Risk Alert