Editing Tidal power (section)

==== Tidal turbines ====
The main environmental concern with tidal energy is associated with blade strike and entanglement of marine organisms as high-speed water increases the risk of organisms being pushed near or through these devices. As with all offshore renewable energies, there is also a concern about how the creation of [[electromagnetic field]]s and acoustic outputs may affect marine organisms. Because these devices are in the water, the acoustic output can be greater than those created with [[Offshore wind power|offshore wind energy]]. Depending on the [[frequency]] and [[amplitude]] of [[sound]] generated by the tidal energy devices, this acoustic output can have varying effects on marine mammals (particularly those who [[Animal echolocation|echolocate]] to communicate and navigate in the marine environment, such as [[dolphin]]s and [[whale]]s). Tidal energy removal can also cause environmental concerns such as degrading far-field [[water quality]] and disrupting [[sediment]] processes.<ref>{{Cite journal|last1=Li|first1=X.|last2=Li|first2=M.|last3=Amoudry|first3=L. O.|last4=Ramirez-Mendoza|first4=R.|last5=Thorne|first5=P. D.|last6=Song|first6=Q.|last7=Zheng|first7=P.|last8=Simmons|first8=S. M.|last9=Jordan|first9=L. -B.|last10=McLelland|first10=S. J.|date=2019-11-25|title=Three-dimensional modelling of suspended sediment transport in the far wake of tidal stream turbines|journal=Renewable Energy|volume=151|pages=956–965|doi=10.1016/j.renene.2019.11.096|doi-access=free|url=https://hull-repository.worktribe.com/preview/3474423/renene-2019-11-096.pdf}}</ref><ref>{{Cite journal|last1=Martin-Short|first1=R.|last2=Hill|first2=J.|last3=Kramer|first3=S. C.|last4=Avdis|first4=A.|last5=Allison|first5=P. A.|last6=Piggott|first6=M. D.|date=2015-04-01|title=Tidal resource extraction in the Pentland Firth, UK: Potential impacts on flow regime and sediment transport in the Inner Sound of Stroma|journal=Renewable Energy|volume=76|pages=596–607|doi=10.1016/j.renene.2014.11.079|doi-access=free|bibcode=2015REne...76..596M |hdl=10044/1/40674|hdl-access=free}}</ref> Depending on the size of the project, these effects can range from small traces of sediment building up near the tidal device to severely affecting nearshore [[ecosystem]]s and processes.<ref name="tethys.pnnl.gov">{{cite web|title=Tethys|url=http://tethys.pnnl.gov/|url-status=live|archive-url=https://web.archive.org/web/20140525011534/http://tethys.pnnl.gov/|archive-date=2014-05-25}}</ref>