{"id":6114,"date":"2026-10-19T09:48:29","date_gmt":"2026-10-19T09:48:29","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardedlisfraedi-hannah-iona-reynolds\/"},"modified":"2026-10-19T09:48:29","modified_gmt":"2026-10-19T09:48:29","slug":"doktorsvorn-i-jardedlisfraedi-hannah-iona-reynolds","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardedlisfraedi-hannah-iona-reynolds\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0e\u00f0lisfr\u00e6\u00f0i – Hannah Iona Reynolds"},"content":{"rendered":"
\n
\n

Doktorsefni:<\/strong> Hannah Iona Reynolds.<\/p>\n

Heiti ritger\u00f0ar:<\/strong> Eldvirkni og jar\u00f0hiti undir j\u00f6klum. M\u00e6lingar og l\u00edkanreikningar \u00e1 varmafl\u00e6\u00f0i.<\/p>\n

Andm\u00e6lendur:<\/strong><\/p>\n

Dr. Shaul Hurwitz, S\u00e9rfr\u00e6\u00f0ingur hj\u00e1 Jar\u00f0v\u00edsindastofnun Bandar\u00edkjanna \u00ed Kaliforn\u00edu.<\/p>\n

Dr. Lionel Wilson, pr\u00f3fessor Emeritus hj\u00e1 Umhverfismi\u00f0st\u00f6\u00f0inni vi\u00f0 h\u00e1sk\u00f3lann \u00ed Lancaster, Bretlandi.<\/p>\n

Lei\u00f0beinandi:<\/strong> Magn\u00fas Tumi Gu\u00f0mundsson, pr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

A\u00f0rir \u00ed doktorsnefnd: <\/strong>Gu\u00f0ni Axelsson, svi\u00f0sstj\u00f3ri kennslu og \u00fer\u00f3unar hj\u00e1 \u00cdslenskum Orkuranns\u00f3knum, Reykjav\u00edk og Freysteinn Sigmundsson, v\u00edsindama\u00f0ur \u00e1 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong> Andri Stef\u00e1nsson, varadeildarforseti Jar\u00f0v\u00edsindadeildar.<\/p>\n

\u00c1grip af ranns\u00f3kn: <\/strong>Merki um \u00fatstreymi varma \u00ed eldfj\u00f6llum eru algeng, og geta stafa\u00f0 af eldgosum e\u00f0a jar\u00f0hitavirkni. Ef fr\u00e1 eru talin sj\u00e1lf eldgosin, er oft erfitt a\u00f0 meta umfang og afl sl\u00edks \u00fatstreymis til andr\u00famsloftsins \u00fear sem \u00f3vissa \u00ed m\u00e6lingum eru mikil. \u00deegar eldfj\u00f6ll eru hulin j\u00f6kli gegnir \u00fe\u00f3 \u00f6\u00f0ru m\u00e1li, \u00fear sem \u00edsinn getur virka\u00f0 eins og varmam\u00e6lir \u00fear sem h\u00e6gt er a\u00f0 meta me\u00f0 \u00feokkalegri n\u00e1kv\u00e6mni b\u00e6\u00f0i afl og orku \u00fat fr\u00e1 magni \u00edss sem br\u00e1\u00f0nar yfir tilteki\u00f0 t\u00edmabil. Markmi\u00f0 \u00feessa verkefnis er a\u00f0 auka skilning \u00e1 e\u00f0li og umfangi varma\u00fatstreymis af \u00feessu tagi \u00ed eldst\u00f6\u00f0vum undir j\u00f6kli \u00e1 \u00cdslandi, einkum a\u00f0 varpa lj\u00f3si \u00e1 hvernig sl\u00edk varmafr\u00e1vik tengjast innskotum grunnt \u00ed jar\u00f0skorpunni og eldgosum undir j\u00f6kli. Ranns\u00f3knin beinist a\u00f0 \u00feremur sv\u00e6\u00f0um: Gr\u00edmsv\u00f6tnum, B\u00e1r\u00f0arbungu og Dyngjuj\u00f6kli.<\/p>\n

Br\u00e6\u00f0sla \u00edss \u00ed Gr\u00edmsv\u00f6tnum yfir t\u00edmabili\u00f0 1998 til 2016 er metin \u00fat fr\u00e1 \u00e1rlegri kortlagningu yfirbor\u00f0s j\u00f6kulsins. Me\u00f0 samanbur\u00f0i kortanna f\u00e6st n\u00e1kv\u00e6masta mat sem hinga\u00f0 til hefur veri\u00f0 gert \u00e1 varmaafli Gr\u00edmsvatna. Ranns\u00f3knin lei\u00f0ir \u00ed lj\u00f3s a\u00f0 yfir \u00feetta 18 \u00e1ra t\u00edmabil var heildarvarmaafli\u00f0 um 1.8 GW. Um \u00feri\u00f0jungur af heildaraflinu, \u00fe.e. 0.6 GW er sveiflukenndur og samanstendur af nokkrum toppum sem tengjast eldgosum og aukinni jar\u00f0hitavirkni, b\u00e6\u00f0i fyrir gos og \u00ed kj\u00f6lfar \u00feeirra. Sl\u00edkir toppar \u00ed jar\u00f0hitavirkni fylgdu \u00f6llum \u00feremur eldgosunum sem ur\u00f0u \u00ed Gr\u00edmsvatna\u00f6skjunni \u00e1 t\u00edmabilinu.<\/p>\n

Um mi\u00f0jan \u00e1g\u00fastm\u00e1nu\u00f0 2014 h\u00f3fst jar\u00f0skj\u00e1lftavirkni \u00ed B\u00e1r\u00f0arbungu\u00f6skjunni og \u00ed kj\u00f6lfar hennar var\u00f0 til berggangur \u00ed jar\u00f0skorpunni undir Dyngjuj\u00f6kli sem n\u00e1\u00f0i fr\u00e1 B\u00e1r\u00f0arbungu nor\u00f0ur \u00ed Holuhraun. Sigkatlar myndu\u00f0ust \u00ed Dyngjuj\u00f6kli yfir ganginum og \u00e1 nokkrum st\u00f6\u00f0um \u00e1 br\u00fanum B\u00e1r\u00f0arbungu\u00f6skjunnar. Afl varmafl\u00e6\u00f0isins og tilt\u00f6lulega skammur l\u00edft\u00edmi \u00feess undir k\u00f6tlunum \u00ed Dyngjuj\u00f6kli ver\u00f0ur ekki sk\u00fdrt nema me\u00f0 litlum eldgosum upp \u00e1 j\u00f6kulbotninn. Aftur \u00e1 m\u00f3ti benda l\u00edkanreikningar til \u00feess a\u00f0 sigkatlar \u00ed br\u00fanum B\u00e1r\u00f0arbungu hafi orsakast af breytingum \u00ed berglekt samfara sigi \u00f6skjunnar auk \u00feess sem grunn innskot g\u00e6tu hafa \u00e1tt \u00fe\u00e1tt \u00ed a\u00f0 auka jar\u00f0hitann. \u00c1 tveggja \u00e1ra t\u00edmabili fr\u00e1 \u00fev\u00ed a\u00f0 umbrotin \u00ed B\u00e1r\u00f0arbungu h\u00f3fust, er me\u00f0alafl jar\u00f0hitans \u00fear um 270 MW.<\/p>\n

Varmafl\u00e6\u00f0i fr\u00e1 grunnum kvikuinnskotum var kanna\u00f0 me\u00f0 t\u00f6lulegum reikningum me\u00f0 forritinu HYDROTHERM. Ni\u00f0urst\u00f6\u00f0urnar s\u00fdna a\u00f0 tveir \u00fe\u00e6ttir r\u00e1\u00f0a mestu um hve miki\u00f0 varmafl\u00e6\u00f0i ver\u00f0ur upp til yfirbor\u00f0s: Lekt bergsins og hiti bergs og grunnvatns \u00e1\u00f0ur en innskoti\u00f0 ver\u00f0ur til. S\u00e9 lektin mikil veldur \u00fea\u00f0 h\u00e1u varmafl\u00e6\u00f0i. H\u00e1r hiti fyrir innskot veldur \u00fev\u00ed a\u00f0 l\u00edtinn vi\u00f0b\u00f3tarvarma \u00fearf til a\u00f0 auka mj\u00f6g varmafl\u00e6\u00f0i\u00f0. Ef hiti \u00ed berginu er l\u00e1gur \u00e1\u00f0ur en innskoti\u00f0 myndast, fer varmi innskotsins \u00ed a\u00f0 hita upp umhverfi\u00f0, berg og grunnvatn, \u00e1n \u00feess a\u00f0 verulega aukinn varmaflutningur ver\u00f0i til yfirbor\u00f0s. Ef sprungur og\/e\u00f0a \u00fer\u00f6ng sv\u00e6\u00f0i me\u00f0 h\u00e1a lekt myndast e\u00f0a eru til sta\u00f0ar ofan vi\u00f0 l\u00f3\u00f0r\u00e9tt innskot ver\u00f0ur \u00f6flugt varmafl\u00e6\u00f0i um \u00feau sem skilar s\u00e9r hratt upp til yfirbor\u00f0s. Suma sigkatlana \u00ed B\u00e1r\u00f0arbungu vir\u00f0ist vera h\u00e6gt a\u00f0 sk\u00fdra me\u00f0 sl\u00edkum h\u00e1lektarsv\u00e6\u00f0um.<\/p>\n

Um doktorsefni\u00f0: <\/strong>Hannah f\u00e6ddist 1987 og \u00f3lst upp \u00ed Dundee \u00ed Skotlandi. Foreldrar hennar eru Andrea og Stephen Reynolds. H\u00fan lauk BSc pr\u00f3fi \u00ed stjarne\u00f0lisfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Edinborg en vann s\u00ed\u00f0an fyrir f\u00e9lags\u00fej\u00f3nustu Edinborgar 2009-2011. H\u00fan lauk MSc pr\u00f3fi \u00ed eldfjallafr\u00e6\u00f0i og n\u00e1tt\u00farv\u00e1 vi\u00f0 Lancasterh\u00e1sk\u00f3la me\u00f0 fyrstu einkunn \u00e1ri\u00f0 2012. Hannah h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands 2013, sem hluti af Marie Curie verkefninu NEMOH. Doktorsn\u00e1mi\u00f0 f\u00f3r a\u00f0 mestu fram \u00e1 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3lans en h\u00fan dvaldi einnig um t\u00edma vi\u00f0 h\u00e1sk\u00f3lana \u00ed Bristol og \u00ed Munchen.<\/p>\n

Facebook vi\u00f0bur\u00f0ur<\/a><\/p>\n<\/div><\/div>","protected":false},"featured_media":1934,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2017-12-18T13:00:00+00:00","_phd_date_end":"2017-12-18T16:00:00+00:00","_phd_location":"Askja N-132","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Eldvirkni og jar\u00f0hiti undir j\u00f6klum. M\u00e6lingar og l\u00edkanreikningar \u00e1 varmafl\u00e6\u00f0i","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_jardedlisfraedi_hannah_iona_reynolds","_phd_source_node_id":"309264","_phd_source_type":"vidburdir","_phd_member_id":545,"footnotes":""},"phd_school":[113,93],"phd_discipline":[114],"class_list":["post-6114","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-jardvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-jardedlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6114\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1934"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6114"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6114"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}