The Two faces of Wind Force(*)

  

     The increasing of wind velocity as cited on SCOTT EICHELBERGER, JAMES MCCAA, BART NIJSSEN & ANDREW WOOD(2008) imply on good oportunity to use the wind as energy. But,the increasing of catastrophic events due to high velocity of wind may occure. Thus this fact needs a good project on infrastructure, as considering this velocities on structural projects.There are benefits and hazards of increasing or decreasing of wind force in all geographical areas and human activities.
    In the sea more intensity and height of waves, more erosion on coastal areas, more increasing of evaporation. In the Rural areas more devastating events on cultivated area as the easy propagation of fire. In the cities more buildings destroyed, more dead people,cars destroyed by hurricanes that carry them or fall of trees.This type of event are been solved by help of alerts on communication media.
    Perhaps the area with good perspectives is the wind power, despite of the possible adaptation of wind turbines (i.e, aerodynamic design of blades) or the risk of decreasing wind in some geographical areas due to climate changes.

More information


(1) SCOTT EICHELBERGER, JAMES MCCAA, BART NIJSSEN & ANDREW WOOD(2008) , Climate changes Effect on Wind speed, North America   WindPower,July 2008

(2)World Maps about windpower
https://www.thewindpower.net/media_maps_en.php

(3) How to service and maintain a wind turbine blade
https://www.windpowermonthly.com/article/1137943/service-maintain-wind-turbine-blade
(4) Wind power capacity in the world.
http://gwec.net/global-figures/interactive-map/

(5) Plans for world’s ‘largest and most powerful’ offshore wind turbine unveiled.
https://www.cnbc.com/2018/03/01/plans-for-worlds-largest-and-most-powerful-offshore-wind-turbine-unveiled.html

(6) Wind Speed to upset vehicles.PDF file:   https://ams.confex.com/ams/pdfpapers/50675.pdf

(7)Climate Change May Mean Slower Winds. https://www.scientificamerican.com/article/climate-change-may-mean-slower-winds/

(8)Climate Impacts on Coastal Areas. https://19january2017snapshot.epa.gov/climate-impacts/climate-impacts-coastal-areas_.htm

(9)Climate Change. National Geographic Society. https://www.nationalgeographic.org/encyclopedia/climate-change/





(*) This article is jointed from two with same title that I published  on https://waterandstructuresmath.wordpress.com

Epanet 'system ill-conditioned' message

Some mistakes related when writing data to EPANET is written below. All this may result on running error message  “system ill-conditioned”.
a) junction without valve:  It is very usual to simplify analysis consider the end of a pipe of fixed flow, but if this is an end of network this become a difficult of processing if this is not associated to a valve, so the solution to solve this problem is add a valve that satisfies the flow conditions at considered point.
b) reservoir with incomplete data: This EPANET element may corresponds to a lake, river, dams. Completing description on the way of connecting them to the network solves the problem.
c) pipe without roughness or another missing value: To solve this problem you will need to use your calculator or calculate on a sheet computer
d) inconsistent geometric data: at this topic are levels higher then tanks top level, lower point of a pipe with disagreement of lower point of next structures. An review of levels solve the problem.
e) pressure that makes no flows. This happens when a default value is used instead of the correct value. A review of pressures using Bernoulli equation  probably solves the problem.