I was under the impression that turbines have to shut down ("cutout") as wind
speeds approach gale level. I take it I am mistaken.
Chris Green
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Mark Z. Jacobson
Sent: Friday, February 28, 2014 11:02 AM
To: Hawkins, Dave; Jim Fleming
Cc: Geoengineering
Subject: Re: [geo] Wind turbines as hurricane tamers?
Dear all, the paper is located at
http://www.stanford.edu/group/efmh/jacobson/Articles/I/WindHurricane/WindHurric.html
The turbines would be installed primarily to generate electric power year
around and would pay for themselves over time doing this. There is a cost
analysis in the paper assuming 1-2 hurricanes striking a given area over 30
years. The cost benefit of the turbines per kWh averaged over this time is much
smaller than the air pollution cost reduction benefit, which is why the primary
purpose is to generate electricity/offset fossil fuels. Hurricane dampening
would be a secondary "free" benefit, unlike sea walls, which cost $30 billion
for one city but don't pay for themselves or reduce wind speed (only storm
surge).
Sincerely,
Mark Jacobson
On 2/28/14 7:07 AM, Hawkins, Dave wrote:
> True enough. Suggests that hurricane taming would be at best a secondary
> factor in size and location of offshore wind farms. One could do a
> probabilistic analysis and see if the hurricane taming potential had
> noticeable economic value.
>
> Typed on tiny keyboard. Caveat lector.
>
>
> On Feb 28, 2014, at 3:56 PM, "Jim Fleming"
> <[email protected]<mailto:[email protected]>> wrote:
>
> This analysis assumes you know where "upstream" of a city actually is.
> See the attached map of Florida landfalling hurricane
> trajectories.<tracks of hurricanes.jpg>
>
> James Fleming
> On Sabbatical
> STS Program
> Colby College
> Web:
> http://www.colby.edu/profile/jfleming<http://web.colby.edu/jfleming>
>
> Toxic Airs (March 2014)
> http://www.upress.pitt.edu/BookDetails.aspx?bookId=36392
>
>
>
>
>
> On Fri, Feb 28, 2014 at 9:39 AM, Hawkins, Dave
> <[email protected]<mailto:[email protected]>> wrote:
> Interesting analysis suggesting an action that is both a type of
> geo-engineering and emissions mitigation.
>
>
> Abstract of Nature Climate Change paper
>
> Hurricanes are causing increasing damage to many coastal regions worldwide.
> Offshore wind turbines can provide substantial clean electricity year-round,
> but can they also mitigate hurricane damage while avoiding damage to
> themselves? This study uses an advanced climate–weather computer model that
> correctly treats the energy extraction of wind turbines to examine this
> question. It finds that large turbine arrays (300+ GW installed capacity) may
> diminish peak near-surface hurricane wind speeds by 25–41 m s−1 (56–92 mph)
> and storm surge by 6–79%. Benefits occur whether turbine arrays are placed
> immediately upstream of a city or along an expanse of coastline. The
> reduction in wind speed due to large arrays increases the probability of
> survival of even present turbine designs. The net cost of turbine arrays
> (capital plus operation cost less cost reduction from electricity generation
> and from health, climate, and hurricane damage avoidance) is estimated to be
> less than today’s fossil fuel electricity generation net cost in these
> regions and less than the net cost of sea walls used solely to avoid storm
> surge damage.
>
> REFERENCES:
>
> * Mark Z Jacobson, Cristina L Archer, Willett Kempton, Taming hurricanes
> with arrays of o ffshore wind turbines, Nature Climate Change, 2014, DOI:
> 10.1038/NCLIMATE2120<http://dx.doi.org/10.1038/nclimate2120>
>
>
> Sent from my iPad
>
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--
Mark Z. Jacobson
Professor of Civil and Environmental Engineering
Director, Atmosphere/Energy Program Phone: 650-723-6836
Stanford University Fax: 650-723-7058
Yang & Yamazaki Environ. and Energy Bldg [email protected]
473 Via Ortega, Room 397 Twitter: @mzjacobson
Stanford, CA 94305-4020 www.stanford.edu/group/efmh/jacobson/
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