{"id":6070,"date":"2026-10-19T09:48:26","date_gmt":"2026-10-19T09:48:26","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-umhverfisfraedi-morgane-c-priet-maheo\/"},"modified":"2026-10-19T09:48:26","modified_gmt":"2026-10-19T09:48:26","slug":"doktorsvorn-i-umhverfisfraedi-morgane-c-priet-maheo","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-umhverfisfraedi-morgane-c-priet-maheo\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed umhverfisfr\u00e6\u00f0i &#8211; Morgane C. Priet Mah\u00e9o"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><strong>Doktorsefni:<\/strong>\u00a0Morgane C. Priet-Mah\u00e9o<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0Straumfr\u00e6\u00f0i me\u00f0alst\u00f3rs st\u00f6\u00f0uvatns \u00ed kaldtempra\u00f0a beltinu: Vettvangsm\u00e6lingar og reiknil\u00edkan (Internal dynamics of a medium size subarctic lake: field measurements and numerical modeling)<\/p>\n<p><strong>Andm\u00e6lendur:<\/strong><\/p>\n<p>Dr. Ben Hodges, pr\u00f3fessor \u00ed \u00a0\u00ed umhverfis- og byggingarverkfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Austin, Texas, og dr. David C. Finger, lektor vi\u00f0 Verkfr\u00e6\u00f0ideild H\u00e1sk\u00f3lans \u00ed Reykjav\u00edk<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong>\u00a0Dr. Hrund \u00d3. Andrad\u00f3ttir, pr\u00f3fessor vi\u00f0 Umhverfis- og byggingarverkfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands<strong><br \/><\/strong><\/p>\n<p><strong>Einnig \u00ed doktorsnefnd:<\/strong><\/p>\n<p>Dr. Francisco Rueda, pr\u00f3fessor vi\u00f0 vatnaverkfr\u00e6\u00f0ideild H\u00e1sk\u00f3lans \u00ed Granada, Sp\u00e1ni<br \/> Dr. J\u00f3n \u00d3lafsson, pr\u00f3fessor emeritus vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<br \/> Dr. Sigur\u00f0ur M. Gar\u00f0arsson, pr\u00f3fessor vi\u00f0 Umhverfis- og byggingarverkfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands og forseti Verkfr\u00e6\u00f0i- og n\u00e1tt\u00faruv\u00edsindasvi\u00f0s <strong><br \/> <\/strong><\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Gu\u00f0mundur Freyr \u00dalfarsson, pr\u00f3fessor og deildarforseti Umhverfis- og byggingarverkfr\u00e6\u00f0ideildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>Hl\u00fdnun jar\u00f0ar hefur mikil \u00e1hrif \u00e1 Nor\u00f0urskautssv\u00e6\u00f0inu og \u00fear eru a\u00f0 opnast n\u00fdir m\u00f6guleikar til samgangna og annarra athafna. Hl\u00fdnuninni fylgja miklar ve\u00f0urfars- og samf\u00e9lagsbreytingar \u00e1 a\u00f0liggjandi sv\u00e6\u00f0um, einkum \u00ed kaldtempra\u00f0a beltinu. \u00dev\u00ed er \u00e1r\u00ed\u00f0andi a\u00f0 auka alhli\u00f0a skilning \u00e1 ferskvatns-vistkerfum \u00e1 \u00feessu belti. \u00deessi ranns\u00f3kn leggur mat \u00e1 e\u00f0lisfr\u00e6\u00f0ilega ferla \u00ed Leginum \u00e1 H\u00e9ra\u00f0i sem d\u00e6mi af veikum lagskiptum st\u00f6\u00f0uv\u00f6tnum \u00e1 nor\u00f0ursl\u00f3\u00f0um. Vettvangsranns\u00f3knir sumrin 2010 og 2011 gefa til kynna skammvinna lagskiptingu sem hverfur \u00feegar hitafl\u00e6\u00f0i ver\u00f0ur neikv\u00e6tt. Innri bylgjur \u00ed vatnsbolnum \u00fer\u00f3ast hratt \u00feegar lagskipting styrkist, l\u00f3\u00f0r\u00e9tt streymi eykst og Kelvin-\u00f6ldur eru merkjanlegar. J\u00f6kuls\u00e1 \u00ed Flj\u00f3tsdal ber me\u00f0 s\u00e9r miki\u00f0 magn f\u00ednger\u00f0ra setagna \u00ed Lagarflj\u00f3t. Vi\u00f0b\u00fai\u00f0 er a\u00f0 mest af set\u00f6gnunum haldist \u00ed sviflausn og getur \u00fea\u00f0 breytt e\u00f0lis\u00feyngd vatnss\u00falunnar, sem veldur vi\u00f0sn\u00fanum hitastigli. \u00dear a\u00f0 auki sveigist straumur j\u00f6kulvatns a\u00f0 eystri bakka Lagarins vegna Coriolis-kraftsins og helst \u00fev\u00ed lengur \u00e1 grynningum en ella \u00e1\u00f0ur en \u00fea\u00f0 rennur \u00fat \u00e1 mitt st\u00f6\u00f0uvatni\u00f0. Ni\u00f0urst\u00f6\u00f0ur \u00far M\u00fcnnich-l\u00edkaninu gefa til kynna a\u00f0 n\u00e1tt\u00farulegar sveiflur \u00ed vatninu eru n\u00e1l\u00e6gt sveiflut\u00edma vinds. \u00der\u00edv\u00ed\u00f0a straumfr\u00e6\u00f0ilega reiknil\u00edkani\u00f0 Si3D var a\u00f0laga\u00f0 til a\u00f0 taka tillit til svifagna. L\u00edkani\u00f0 endurspeglar innri hreyfingar sem m\u00e6last \u00ed vatninu og s\u00fdnir ranns\u00f3knin \u00fev\u00ed fram \u00e1 nytsemi \u00feessa l\u00edkans vi\u00f0 greiningu veikrar lagskiptingar \u00ed st\u00f6\u00f0uv\u00f6tnum. Ni\u00f0urst\u00f6\u00f0ur benda til \u00feess a\u00f0 vindur s\u00e9 helsti drifkraftur innri bylgjuhreyfinga Lagarins. \u00c1hrif innstreymis J\u00f6kuls\u00e1r \u00e1 hringr\u00e1sina \u00ed vatninu og \u00fear me\u00f0 \u00e1 lagskiptinguna eru einnig veruleg. L\u00edkani\u00f0 sta\u00f0festir tilvist Kelvin-bylgna \u00ed vatninu. \u00deegar fylgst er me\u00f0 hvernig J\u00f6kuls\u00e1 \u00ed Flj\u00f3tsdal blandast vi\u00f0 vatni\u00f0 vir\u00f0ist innstreymisd\u00fdptin \u00ed vatnsbolnum vera h\u00e1\u00f0 innri bylgjuhreyfingum hans. \u00c1 sumrin br\u00fdst j\u00f6kul\u00e1in inn um mi\u00f0jan bol st\u00f6\u00f0uvatnsins e\u00f0a eftir botninum sem undirfl\u00e6\u00f0i. Vatn sem rennur eftir botninum getur innikr\u00f3ast \u00fear og sveiflast fram og til baka. \u00dev\u00ed er skipt \u00fat \u00feegar n\u00fdtt undirfl\u00e6\u00f0i rennur vi\u00f0 botninn og lyftir fyrirliggjandi vatni upp. J\u00f6kulvatn sem berst \u00ed vatni\u00f0 sem innra fl\u00e6\u00f0i um mi\u00f0bik \u00feess blandast betur og skolast nokku\u00f0 jafnt \u00fat \u00far \u00fev\u00ed aftur. \u00dear sem vatnshringr\u00e1sin \u00ed Leginum er h\u00e1\u00f0 styrkleika lagskiptingarinnar er vi\u00f0b\u00fai\u00f0 a\u00f0 innri hrif muni breytast verulega vi\u00f0 h\u00e6kkandi vatnshita.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Morgane C. Priet-Mah\u00e9o er f\u00e6dd 1982 og er fr\u00e1 Rennes \u00ed Frakklandi. H\u00fan hlaut B.Sc. gr\u00e1\u00f0u og ma\u00eetrise \u00ed landafr\u00e6\u00f0i fr\u00e1 University of Rennes II \u00e1rin 2003 og 2004 og M.Sc. gr\u00e1\u00f0u \u00ed Geoenvironment fr\u00e1 Blaise Pascal University \u00ed Clermont-Ferrand \u00e1ri\u00f0 2005. Eftir a\u00f0 hafa flutt til \u00cdslands og unni\u00f0 \u00ferj\u00fa \u00e1r \u00e1 Siglingastofnun h\u00f3f h\u00fan doktorsn\u00e1m sitt vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2010. <br \/> Morgane hefur unni\u00f0 sem s\u00e9rfr\u00e6\u00f0ingur \u00ed vatna- og straumfr\u00e6\u00f0i hj\u00e1 Ve\u00f0urstofu \u00cdslands s\u00ed\u00f0an \u00ed desember 2015.<strong><br \/> 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