{"id":6131,"date":"2026-10-19T09:48:31","date_gmt":"2026-10-19T09:48:31","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-skafta-brynjolfssonar\/"},"modified":"2026-10-19T09:48:31","modified_gmt":"2026-10-19T09:48:31","slug":"doktorsvorn-skafta-brynjolfssonar","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-skafta-brynjolfssonar\/","title":{"rendered":"Doktorsv\u00f6rn Skafta Brynj\u00f3lfssonar"},"content":{"rendered":"
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Fimmtudaginn 9. febr\u00faar flytur Skafti Brynj\u00f3lfsson fyrirlestur um doktorsverkefni sitt \u00ed jar\u00f0v\u00edsindum. Verkefni\u00f0 ber heiti\u00f0 J\u00f6klunarsaga Drangaj\u00f6kuls (Dynamics and glacial history of the Drangaj\u00f6kull ice cap, Northwest Iceland).<\/p>\n

Um er a\u00f0 r\u00e6\u00f0a sameiginlega pr\u00f3fgr\u00e1\u00f0u fr\u00e1 H\u00e1sk\u00f3la \u00cdslands og V\u00edsinda- og t\u00e6knih\u00e1sk\u00f3lanum \u00ed \u00der\u00e1ndheimi (NTNU), Noregi og f\u00f3r doktorsv\u00f6rnin fram \u00ed Noregi \u00feann 24. september 2015.<\/p>\n

Lei\u00f0beinendur voru dr. \u00d3lafur Ing\u00f3lfsson, pr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands, dr. Anders Schomacker, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3lann \u00ed Troms\u00f6 og d\u00f3sent vi\u00f0 H\u00e1sk\u00f3lann \u00ed Kaupmannah\u00f6fn og dr. Achim Beylich, v\u00edsindama\u00f0ur vi\u00f0 Geological Survey of Norway. \u00cd d\u00f3mnefnd s\u00e1tu dr. Bj\u00f8rge Brattli, pr\u00f3fessor vi\u00f0 jar\u00f0v\u00edsindadeild Norska v\u00edsinda- og t\u00e6knih\u00e1sk\u00f3lans \u00ed \u00der\u00e1ndheimi, dr. Nicolaj K. Larsen, d\u00f3sent vi\u00f0 jar\u00f0v\u00edsindadeild \u00c1r\u00f3sah\u00e1sk\u00f3la og pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3lann \u00ed Kaupmannah\u00f6fn, Danm\u00f6rku, og dr. Armelle Decaulne, jar\u00f0fr\u00e6\u00f0ingur \u00e1 Laboratoire G\u00e9olittomer vi\u00f0 H\u00e1sk\u00f3lann \u00ed Nantes, Frakklandi.<\/p>\n

Andm\u00e6lendur voru dr. Nicolaj K. Larsen, d\u00f3sent vi\u00f0 jar\u00f0v\u00edsindadeild \u00c1r\u00f3sah\u00e1sk\u00f3la, Danm\u00f6rku og dr. Armelle Decaulne, jar\u00f0fr\u00e6\u00f0ingur \u00e1 Laboratoire G\u00e9olittomer vi\u00f0 H\u00e1sk\u00f3lann \u00ed Nantes, Frakklandi.<\/p>\n

\u00c1grip af ranns\u00f3kn<\/strong><\/p>\n

\u00cd doktorsritger\u00f0inni er fjalla\u00f0 um j\u00f6klunars\u00f6gu, sveiflur, setmyndanir og landm\u00f3tun Drangaj\u00f6kuls. Einnig er fjalla\u00f0 um j\u00f6klunars\u00f6gu Vestfjar\u00f0a, fr\u00e1 seinni hluta s\u00ed\u00f0asta j\u00f6kulskei\u00f0s til n\u00fat\u00edma. A\u00f0almarkmi\u00f0 ranns\u00f3knarinnar var a\u00f0 kanna betur s\u00f6gu j\u00f6klunar og framhlaupa Drangaj\u00f6kuls.
\nNi\u00f0urst\u00f6\u00f0ur verkefnisins benda til \u00feess a\u00f0 Vestfir\u00f0ir hafi a\u00f0 langmestu leyti veri\u00f0 huldir j\u00f6kli \u00e1 h\u00e1marki s\u00ed\u00f0asta j\u00f6kulskei\u00f0s, og j\u00f6kul\u00feekjan var undir sterkum \u00e1hrifum dj\u00fapra dala og fjar\u00f0a Vestfjar\u00f0skagans. \u00de\u00ed\u00f0j\u00f6klar\/\u00edsstraumar fl\u00e6ddu tilt\u00f6lulega hratt \u00ed fj\u00f6r\u00f0um og d\u00f6lum og rufu undirlag sitt. Ofarlega \u00ed fjallshl\u00ed\u00f0um e\u00f0a yfir fjalllendi voru sn\u00f6rp skil \u00ed eiginleikum j\u00f6kulsins. \u00dear uppi var gaddj\u00f6kull r\u00e1\u00f0andi, sem fl\u00e6ddi h\u00e6gt vi\u00f0 innri afl\u00f6gun og l\u00e9t undirlag sitt a\u00f0 mestu \u00f3snorti\u00f0. J\u00f6kulh\u00f6rfun h\u00f3fst \u00e1 h\u00e6stu fj\u00f6llum fyrir um 26 \u00fe\u00fasund \u00e1rum, j\u00f6klaleysingin var \u00f3samst\u00edga milli sv\u00e6\u00f0a, en fyrir um 14-15 \u00fe\u00fasund \u00e1rum voru h\u00e6rri landsv\u00e6\u00f0i og sumir dalir \u00feegar or\u00f0nir \u00edslausir \u00e1 me\u00f0an a\u00f0rir fir\u00f0ir og dalir m\u00e1ttu \u00feola \u00e1gang meginskri\u00f0j\u00f6kla Drangaj\u00f6kuls \u00fear til fyrir u.\u00fe.b. 9 \u00fe\u00fasund \u00e1rum.\u00a0<\/span>
\nSv\u00e6\u00f0i\u00f0 umhverfis Drangaj\u00f6kul einkennist af \u00feunnum og gr\u00f3fum j\u00f6kulru\u00f0ningi \u00ed bland vi\u00f0 \u00edsm\u00f3ta\u00f0ar og ve\u00f0ra\u00f0ar klappir en a\u00f0liggjandi dalbotnar eru a\u00f0 mestu huldir \u00e1rm\u00f6l og \u00e1reyrum. Framhlaupsj\u00f6klar Drangaj\u00f6kuls n\u00e1\u00f0u h\u00e1marksst\u00e6r\u00f0 hver \u00ed s\u00ednu lagi \u00e1 \u00e1runum 1700-1846. S\u00f6gulegar heimildir og kortlagning \u00e1 landm\u00f3tunarsv\u00e6\u00f0um \u00feeirra leiddi \u00ed lj\u00f3s j\u00f6kulgar\u00f0a sem voru tv\u00f6falt fleiri en \u00e1\u00f0ur skr\u00e1\u00f0 framhlaup Drangaj\u00f6kuls. Framhlaupahl\u00e9 eru mj\u00f6g \u00f3regluleg, 10-140 \u00e1r, en framhlaup vir\u00f0ast hafa veri\u00f0 einna t\u00ed\u00f0ust \u00e1 19. \u00f6ld og \u00ed upphafi 20. aldarinnar. Ekkert auglj\u00f3st samband loftslags vi\u00f0 eiginleika og t\u00ed\u00f0ni framhlaupanna er greinanlegt. \u00cd s\u00ed\u00f0ustu framhlaupum Drangaj\u00f6kuls var algengasta yfirbor\u00f0s\u00feynning s\u00f6fnunarsv\u00e6\u00f0anna \u00e1 bilinu 10-30 m \u00e1 me\u00f0an \u00feykknun leysingasv\u00e6\u00f0anna var mun breytilegri, e\u00f0a um 10-120 m. \u00der\u00e1tt fyrir neikv\u00e6\u00f0a me\u00f0alafkomu Drangaj\u00f6kuls \u00fea\u00f0 sem af er yfirstandandi kyrrfasa framhlaupsj\u00f6klanna, \u00feykkna s\u00f6fnunarsv\u00e6\u00f0i \u00feeirra a\u00f0 me\u00f0altali um 0,5-0,7 m \u00e1rlega. Uppbygging s\u00f6fnunarsv\u00e6\u00f0anna \u00e1samt um 1 m \u00e1rlegri me\u00f0al\u00feynningu leysingasv\u00e6\u00f0anna lei\u00f0ir til brattara yfirbor\u00f0s j\u00f6kulsins og \u00e1 45-65 \u00e1rum g\u00e6ti yfirbor\u00f0i\u00f0 or\u00f0i\u00f0 samb\u00e6rilegt \u00fev\u00ed sem var fyrir s\u00ed\u00f0asta framhlaup j\u00f6klanna.
\nRanns\u00f3knin hefur leitt \u00ed lj\u00f3s allfl\u00f3ki\u00f0 mynstur \u00edseiginleika, sveiflna og j\u00f6klunars\u00f6gu Drangaj\u00f6kuls. Vitneskju okkar um \u00feessa \u00fe\u00e6tti m\u00e6tti auka me\u00f0 frekari kortlagningu, aldursgreiningu j\u00f6kulmynda\u00f0ra landforma og j\u00f6kul\u00e6tta\u00f0s sets. \u00deannig m\u00e6tti sannreyna \u00fe\u00e6r ni\u00f0urst\u00f6\u00f0ur sem h\u00e9r eru kynntar og skerpa l\u00ednur var\u00f0andi s\u00f6gu og eiginleika s\u00ed\u00f0asta j\u00f6kulskei\u00f0s. Gagnlegt g\u00e6ti veri\u00f0 a\u00f0 beita fleiri a\u00f0fer\u00f0um til a\u00f0 kanna eiginleika, e\u00f0li og s\u00f6gu framhlaupsj\u00f6klanna \u00ed Drangaj\u00f6kli, t.d. langt\u00edmav\u00f6ktun \u00e1 ve\u00f0ri og afkomu j\u00f6klanna, og jar\u00f0e\u00f0lisfr\u00e6\u00f0ilegar kannanir \u00e1 \u00edseiginleikum, undirlagi j\u00f6klanna og landm\u00f3tunarumhverfi \u00feeirra g\u00e6tu einnig auki\u00f0 skilning okkar.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Skafti Brynj\u00f3lfsson er f\u00e6ddur 1982. Hann lauk st\u00fadentspr\u00f3fi fr\u00e1 Verkmenntask\u00f3lanum \u00e1 Akureyri \u00e1ri\u00f0 2003, BS-gr\u00e1\u00f0u \u00ed jar\u00f0fr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2007 og MS-gr\u00e1\u00f0u \u00ed jar\u00f0fr\u00e6\u00f0i fr\u00e1 sama sk\u00f3la \u00e1ri\u00f0 2009. Skafti stunda\u00f0i doktorsn\u00e1mi\u00f0 b\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og V\u00edsinda- og t\u00e6knih\u00e1sk\u00f3lann \u00ed \u00der\u00e1ndheimi \u00fea\u00f0an sem hann lauk sameiginlegri doktorsgr\u00e1\u00f0u. Skafti starfar n\u00fa sem jar\u00f0fr\u00e6\u00f0ingur \u00e1 N\u00e1tt\u00farufr\u00e6\u00f0istofnun \u00cdslands. Hann er kv\u00e6ntur L\u00e1ru Betty Har\u00f0ard\u00f3ttir hj\u00fakrunarfr\u00e6\u00f0ingi og eiga \u00feau \u00ferj\u00fa b\u00f6rn, J\u00f3h\u00f6nnu, H\u00f6r\u00f0 H\u00f6gna og Freyju.\u00a0<\/span><\/p>\n

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