Mokslininkai, tyrin\u0117j\u0119 Kanados Auk\u0161tosios Arkties upes, susid\u016br\u0117 su netik\u0117tu rei\u0161kiniu: kai kur nauji upi\u0173 vag\u0173 kanalai susiformuoja gerokai grei\u010diau, nei leist\u0173 manyti \u012fprastos erozijos taisykl\u0117s. Iki \u0161iol buvo manoma, kad \u012f\u0161alas veikia kaip savoti\u0161ki klijai ir tur\u0117t\u0173 stabdyti grunt\u0173 ardym\u0105.<\/p>\n
Simon Fraser universiteto ir Brit\u0173 Kolumbijos universiteto tyr\u0117jai, analizuodami lauko steb\u0117jimus, pasteb\u0117jo prie\u0161ing\u0105 tendencij\u0105. Duomenys rod\u0117, kad Arkties kra\u0161tovaizdyje erozija gali lenkti net vidutini\u0173 platum\u0173 regionus, nors ten dirvo\u017eemis neu\u017e\u0161\u0105la taip giliai ir ilgai.<\/p>\n
Kontroliuojamuose laboratoriniuose bandymuose komanda suk\u016br\u0117 stiklin\u012f vandens latak\u0105, kuriame up\u0117s \u017evyr\u0105 imitavo stiklo granul\u0117s. Rezultatai nustebino net pa\u010dius autorius: s\u0105na\u0161\u0173 ardymas buvo ma\u017edaug 10 kart\u0173 spartesnis, nei tik\u0117tasi, lyginant su ne\u012f\u0161alusio grunto scenarijais.<\/p>\n
\u201eMes tiesiogine prasme tik\u0117jom\u0117s pamatyti prie\u0161ing\u0105 rezultat\u0105, nei galiausiai pamat\u0117me\u201c, \u2013 sak\u0117 aplinkos mokslininkas Jonas Eschenfelder.<\/p>\n
\u201ePamat\u0117me duomenis, pa\u017ei\u016br\u0117jome vienas \u012f kit\u0105 ir pasak\u0117me: tai negali b\u016bti teisinga\u201c, \u2013 sak\u0117 aplinkos mokslininkas Shawn Chartrand.<\/p>\n
Tyr\u0117j\u0173 ai\u0161kinimu, paradoksas slypi ne visi\u0161kai \u012f\u0161alusiame grunte, o pereinamajame laikotarpyje, kai prasideda sezoninis atitirpimas. Vir\u0161utinis nuos\u0117d\u0173 sluoksnis tampa mink\u0161tesnis, ta\u010diau apa\u010dioje dar i\u0161lieka kietas \u012f\u0161alo barjeras, kuris neleid\u017eia vandeniui skverbtis gilyn.<\/p>\n
D\u0117l to srautas da\u017eniau i\u0161si\u0161akoja \u012f kelias kryptis ir ima \u201epl\u0117\u0161ti\u201c pavir\u0161ines daleles, kartu perne\u0161damas daugiau sm\u0117lio bei grunto. Toks \u0161oninis i\u0161sisklaidymas ir intensyvesnis daleli\u0173 jud\u0117jimas gali paai\u0161kinti, kod\u0117l naujos vagos kai kur formuojasi itin greitai.<\/p>\n
\u0160is mechanizmas svarbus ne vien akademine prasme. Arkties regionas \u0161yla grei\u010diau nei pasaulio vidurkis, tod\u0117l atitirpimo sezonai ilg\u0117ja, o hidrologiniai procesai darosi aktyvesni, kas gali spartinti krant\u0173 ardym\u0105, keisti nuos\u0117d\u0173 perna\u0161\u0105 ir didinti staigi\u0173 vag\u0173 poky\u010di\u0173 rizik\u0105.<\/p>\n
Tyr\u0117jai pabr\u0117\u017eia, kad tikslesn\u0117ms prognoz\u0117ms reikia daugiau vis\u0173 met\u0173 steb\u0117jim\u0173 skirtingomis temperat\u016bros s\u0105lygomis. Darbe pateikti rezultatai publikuoti mokslo \u017eurnale \u201eCommunications Earth & Environment\u201c.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tyrimas Kanados Arkties up\u0117se atskleid\u0117 paradoks\u0105: atitirpstant gruntui erozija gali b\u016bti apie 10 kart\u0173 spartesn\u0117 nei tik\u0117tasi.<\/p>\n","protected":false},"author":0,"featured_media":52368,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[38185,3699,6570,40494,673,40495,1553],"miestas":[],"class_list":["post-52367","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mokslas","tag-amzinas-isalas","tag-arktis","tag-erozija","tag-kanados-arktis","tag-klimato-kaita","tag-simon-fraser-universitetas","tag-upes"],"acf":[],"_links":{"self":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts\/52367","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/comments?post=52367"}],"version-history":[{"count":0,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts\/52367\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/media\/52368"}],"wp:attachment":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/media?parent=52367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/categories?post=52367"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/tags?post=52367"},{"taxonomy":"miestas","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/miestas?post=52367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}