if a tidal turbine is effective to push the water downstream it will have the same effect! increase the downstream level slightly and lower the upstream level a little
except that a reversible turbine well mounted in a dam has a good performance, and a tidal turbine placed in the current is limited by betz ... much less effective!
a tidal turbine is good for marine current that can not be fully captured by a dam ... with the tidal turbine is recovered a small part of the energy but it's easy
in the case of rivers a dam allows the maximum yield as much in electricity production as in pumping
Floods May 2016: Germany, Belgium and France under water
- chatelot16
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Re: May floods 2016: Germany, Belgium and France under water
Yes but a tidal stream costs much less than a dam and is much less constraining for navigation ... moreover all major rivers are already optimized in France dam level ...
There is still a potential "run-of-river" ... making run-of-river tidal turbines of a few tens or even hundreds of kW is still quite feasible, dams not ...
To return to the floods, some photos of Parisians: http://www.telerama.fr/sortir/en-images ... 143401.php
There is still a potential "run-of-river" ... making run-of-river tidal turbines of a few tens or even hundreds of kW is still quite feasible, dams not ...
To return to the floods, some photos of Parisians: http://www.telerama.fr/sortir/en-images ... 143401.php
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Re: May floods 2016: Germany, Belgium and France under water
A video that turns and resumed by a lot of anti-warming ...
https://www.facebook.com/photo.php?v=1917849698441718
Ralalala ....
https://www.facebook.com/photo.php?v=1917849698441718
Ralalala ....
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Re: May floods 2016: Germany, Belgium and France under water
Christophe wrote:Except that a dam, structurally, is not dimensioned so that the downstream level is greater than the upstream level ... obviously we could imagine the size but this would cost roughly at least twice the volume of concrete. ..for a very occasional and punctual use! And if you raise the level of the water side, must be sure that it does not create an overflow off riverbanks downstream, otherwise the dam is strictly for nothing
I think that reversible tidal turbines are a better idea ... but expensive too ...
Wanting to stem a flood is strictly useless, the floods are remembered the perfectly normal phenomena positive virtues for soils (deposits of alluvium).
Originally these were somewhat damped by swamp-like floodplains.With the development of agriculture and construction to excess (the concrete / tarred the surface of a French department every ten years) its areas, formerly free, are now inhabited.
It is therefore useless to add to current problems via dams, but rather to try to deconstruct ...
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Re: May floods 2016: Germany, Belgium and France under water
In Holland they build concrete houses that float ... and able to climb regularly with the water level!
https://www.youtube.com/watch?v=Vzoru1644EU
http://www.lemonde.fr/cop21/article/2015/12/01/aux-pays-bas-apres-avoir-longtemps-lutte-contre-l-eau-il-faut-maintenant-vivre-avec_4821612_4527432.html
https://www.youtube.com/watch?v=Vzoru1644EU
http://www.lemonde.fr/cop21/article/2015/12/01/aux-pays-bas-apres-avoir-longtemps-lutte-contre-l-eau-il-faut-maintenant-vivre-avec_4821612_4527432.html
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- chatelot16
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Re: May floods 2016: Germany, Belgium and France under water
of course the best solution is to build on the hills and abandon the riverside
so we should revise the rules of urban planning, the cities are all on the banks of rivers and we continue to authorize to build to enlarge the city in flood zone and it is forbidden to build in fields or forests always dry
there are districts of town that should be better transformed into poplar forest, which will be happy to be at the edge of the water and will not complain about the flood
So in the majority of France the solution is a better management of the territory!
for the big city it's more complicated, we can not move paris ... the retention basin was almost flat before the flood ... it confirms me that the solution is not retention but pumping to circulate water faster
the seine downstream of paris has already dam ... with geoportail we can see the altitude upstream and downstream ... I found another site with info on the dam ... equip each dam means of quite powerful pumping is not measured at all in comparison to what the current flood
with a good pumping system we lower the upstream level of each dam ... we do not increase the downstream level if the dam further downstream pump too ... we just have more slope in each reach ... more slope means more flow
it requires huge power but we already have nuclear power plant even more huge and it will not stall
so we should revise the rules of urban planning, the cities are all on the banks of rivers and we continue to authorize to build to enlarge the city in flood zone and it is forbidden to build in fields or forests always dry
there are districts of town that should be better transformed into poplar forest, which will be happy to be at the edge of the water and will not complain about the flood
So in the majority of France the solution is a better management of the territory!
for the big city it's more complicated, we can not move paris ... the retention basin was almost flat before the flood ... it confirms me that the solution is not retention but pumping to circulate water faster
the seine downstream of paris has already dam ... with geoportail we can see the altitude upstream and downstream ... I found another site with info on the dam ... equip each dam means of quite powerful pumping is not measured at all in comparison to what the current flood
with a good pumping system we lower the upstream level of each dam ... we do not increase the downstream level if the dam further downstream pump too ... we just have more slope in each reach ... more slope means more flow
it requires huge power but we already have nuclear power plant even more huge and it will not stall
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- chatelot16
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Re: May floods 2016: Germany, Belgium and France under water
I did not believe that the Seine was so deep
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- chatelot16
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Re: May floods 2016: Germany, Belgium and France under water
The original shot without the submarine comes from
http://www.franceinter.fr/depeche-paris ... -du-siecle
for those who are concerned about copyright and who explain that it is a fake (oh good? Are you sure?)
http://www.franceinter.fr/depeche-paris ... -du-siecle
for those who are concerned about copyright and who explain that it is a fake (oh good? Are you sure?)
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Re: May floods 2016: Germany, Belgium and France under water
Some pictures, before / after: http://www.leparisien.fr/info-paris-ile ... 854197.php
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