Polvijärvi (Juuka)

Polvijärvi
Valtiot SuomiView and modify data on Wikidata
Paikkakunta Juuka
Koordinaatit 63°09′55″N, 28°57′25″E
Järvinumero 04.762.1.017
Mittaustietoja
Pinnankorkeus 170 m [1]
Rantaviiva 13,58 km [2]
Pinta-ala 1,83 km² [2]
Tilavuus 0,016 km³ [2]
Keskisyvyys 8,6 m [2]
Suurin syvyys 34,7 m [2]
Kartta
Polvijärvi

Polvijärvi on metsäjärvi Juuan länsiosassa Pohjois-Karjalassa. Sen pinta-ala on 1,8 neliökilometriä. Etäisyys Joensuusta on 73 kilometriä pohjoisluoteeseen.[2][1][3]

Maantiede

Polvijärvi kaartuu pohjoiseen suuntaavan Polviniemen ympärille lännessä, pohjoisessa ja idässä. Järven länsiosan nimi on Salmenselkä ja itäosan nimi Simolanselkä, josta työntyy koilliseen Riihilahti ja kaakkoon Kivilahti. Polvijärven pohjoisosa on syvä. Syvin kohta, noin 35 metriä, sijaitsee altaan luoteisosassa. Järven kaakkoisosa on varsin matalaa. Riihilahden suulla on kolme luotoa, joiden nimi on Pajusaaret. Polviniemi on suurelta osin ylänköä, jonka korkeimmat kohdat ovat noin 250 metriä merenpinnan yläpuolella, eli noin 80 metriä Polvijärven pinnan yläpuolella.[2][1]

Polvijärven luusua sijaitsee altaan lounaisosassa, josta lähtee Salmenjoki etelään Iivonlammen (170,0 metriä mpy) kautta Kajoonjärveen. Polvijärven pohjoispuolella sijaitsee Kalliojärvi ja noin kilometrin itään sijaitsee Koppalanjärvi. Kaakossa on Petrojärvi.[1]

Polvijärven vesitilavuus on 15 809 000 kuutiometriä.[2]

Polvijärvi (04.762.1.017) kuuluu Polvijärven valuma-alueeseen (04.762), joka on kolmannen jakovaiheen vesistö Vuoksen vesistössä (04). Toinen jakovaihe on Kajoonjärven valuma-alue (04.76) ja ensimmäinen jakovaihe Juojärven reitin valuma-alue (04.7). Polvijärvi on Polvijärven valuma-alueen laajin vakavesi, toiseksi laajin on Koppalanjärvi, joka on kuitenkin tilavuudeltaan pienempi kuin valuma-alueen kolmanneksi laajin järvi, eli Kalliojärvi. Polvijärven alueeseen kuuluu 35 vähintään hehtaarin laajuista vakavettä.[4]

Juuan Polvijärvi on toiseksi laajin Suomen viidestätoista Polvijärvestä. Laajin on Lieksan Polvijärvi. Polvijärvet sijaitsevat enimmäkseen itäisessä Suomessa.[5]

Lähteet

  1. ↑ a b c d Polvijärvi, vakavesi, Juuka
  2. ↑ a b c d e f g h Ympäristö.fi : Ympäristötiedon hallintajärjestelmä Hertta Ympäristötiedon hallintajärjestelmä Hertta. Viitattu 10.8.2021.
  3. ↑ Polvijärvi. Järviwiki. Viitattu 10.8.2021.
  4. ↑ Polvijärven valuma-alue (04.762). Järviwiki. Viitattu 10.8.2021.
  5. ↑ Polvijärvi. Järviwiki. Viitattu 10.8.2021.

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