Niagara juga

Joad in Niagara Falls
Niagara juga
Niagara juga — © Anderson Spinelli / 500px
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Niagara juga (Niagara Falls) on juga (õigemini jugade ja kärestike süsteem) Põhja-Ameerikas Niagara jõel. Niagara juga on üks maailma veerohkem ja tuntum juga. Et Niagara jõgi on piirijõgi, siis asub osa joast Kanada ja osa USA territooriumil.

Nimetuse "Niagara juga" alla mahub kolm juga, mida eraldavad saared. Suurem neist on Kanada-poolne Hoburaua juga ehk Hobuseraua juga (Horseshoe Falls), mida nimetatakse ka Kanada joaks. Kitsesaar (Goat Island) eraldab teda USA-poolsest Ameerika joast. Luna saar eraldab Ameerika joast omakorda pisikese Pruudiloori joa (Bridal Veil Falls).

Kõik kolm juga on enam-vähem võrdse kõrgusega (53-57 m), kokku voolab üle jugade ligi 3000 m3 vett sekundis. Kõige suurem on kaarekujuline Hoburaua juga (laius 700 m), mille kaudu langeb umbes 90% jõe veest; ülejäänud veest langeb valdav enamus Ameerika joa (laius 300 m) kaudu. Tänu suurele vooluhulgale ei ole Hoburaua joa all rusu ning juga langeb otse vette. Ameerika ning Pruudiloori joa vool ei ole piisavalt tugev varisenud kivide eemaldamiseks ning nii on mõlema joa alla kuhjunud rusu. Vabalt langeb vesi umbes pool joa kogukõrgusest.

Geoloogiline ehitus ja ajalugu

Joa astang on osa Niagara astangust (Niagara Escarpment), klindinõlvast, mis ulatub Ontario järvest idas Michigani järve läänekaldale.

Astangu pealmise kõvema kihi moodustavad Kesk-Siluri Lockporti dolomiidid, mille all asuvad pehmemad Alam-Siluri kiltkivid.

Jääaja (Wisconsini jäätumise) lõppedes 10 000 aastat tagasi asus juga Niagara astangu joonel Ontario järve lõunakalda lähedal. Järgnevate aastatuhandete jooksul on vesi astangut 11 km lõuna poole uuristanud keskmise kiirusega 1–2 m aastas. Kitsesaareni, kus eraldusid Kanada ja Ameerika haru, jõudis juga umbes 700 aastat tagasi. Palju suurema vooluhulga tõttu on Kanada-poolne juga taganenud palju kiiremini; väikese vooluga Ameerika juga ei suuda varisenud rusu eemaldada ning muutub arvatavasti aja jooksul koseks. Praeguseks on joa liikumise kiirus oluliselt vähenenud, sest üle poole veest juhitakse hüdroelektrijaamadesse.

On arvatud, et mõnekümne tuhande aasta pärast jõuab juga Erie järveni, mille veetase võib selle tulemusel oluliselt langeda.

Vihjed

The Ritz-Carlton
The Ritz-Carlton 14 March 2013
43
There are endless picture-perfect photo opportunities along the walkway at Niagara Falls. For the best shot, get here at night to take in the light show and fireworks!
Shawn
Shawn 6 November 2010
28
Feel free to turn on your cell phones as signal strength from U.S. cell towers will suffice, preventing roaming. U-S-A, U-S-A, U-S-A!
Mary Gazze
Mary Gazze 4 July 2010
12
The view of both falls is better from the Canadian side. You get a good view of just rapids on the American side.
Sandip Panja
Sandip Panja 24 June 2012
11
Horseshoe Falls. A better view from Canada.
American Airlines
American Airlines 27 June 2013
10
Don't miss the Aquarium of Niagara, where you can watch penguin feedings, see sea lions up close and even feed seals yourself.
Graziela Coutinho
Graziela Coutinho 20 May 2012
9
Wonderful place !
ChiefHava
ChiefHava 15 May 2013
6
It's a waterfall
Jacob García
Jacob García 19 September 2014
5
Legend yes go with your partner you marry, is a place that gives you peace and leaves you speechless.
Hanan A.
Hanan A. 6 September 2013
5
Gorgeous place at both daytime or evening! Though daytime is much more beautiful!
Jackie Heroux
Jackie Heroux 1 June 2013
5
If u do go here to visit, ride the Sky Wheel!! :D View is amazing!! :D
TruthorDare.us
TruthorDare.us 14 May 2011
5
We dare you to boat on one of the amazing lakes and rivers available and fishing for a nice catch, follow that with a nice tour around Niagara Falls State Park where there are tons things to see, fini
Sinmi Folarin
Sinmi Folarin 6 July 2014
4
Picture perfect moments. Forgot it is worth the hype it gets.
AZiZ
AZiZ 3 July 2013
4
an amazing view
NiagaraFallsTourism
NiagaraFallsTourism 28 October 2012
4
Niagara Parkway is a spectacular visit in the Fall, just look at these colours! There are also a ton of spooky things to do if you're looking for the Halloween experience!
Nancy Fulton
Nancy Fulton 3 October 2012
4
Bring spare socks of you're doing the maid of the mist
James Gash
James Gash 15 December 2011
4
The rainbow lights are a little tacky. White would be just fine.
Niagara Guy
Niagara Guy 23 September 2010
4
I have lived here over forty years and although things change on the landscape, Great to know that the Niagara Parks Commission and other Local Enthusiasts and Organizations are keeping the area green
Alex McCoy
Alex McCoy 24 March 2013
3
Wear waterproof shoes!!
NiagaraFallsTourism
NiagaraFallsTourism 27 October 2012
3
Plan to come to Niagara Falls in the Winter! We are home to the Winter Festival of Lights, the Falls Illuminations, and the biggest New Years Eve party in Canada.
Cherd
Cherd 24 July 2013
12
ครั้งหนึ่งในชีวิต ได้พบกับสิ่งมหัสจรรย์ ของโลก และ 1 ในที่สุดของอเมริกา เสียดายไม่ได้ไปดูน้ำตก ทางฝั่งแคนาดา เพราะมีแค่วีซ่าของอเมริกา บอกคำเดียว สุดยอดครับ ^___^
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6650 Niagara Parkway, Niagara Falls, Ontario L2G, Kanada
43.0781°, -79.0758°
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