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 -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:geoengineering%[email protected]>. To post to this group, send email to [email protected]<mailto:[email protected]>. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
-- 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/ -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
