{"id":6127,"date":"2026-10-19T09:48:30","date_gmt":"2026-10-19T09:48:30","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardvisindum-muhammad-aufaristama\/"},"modified":"2026-10-19T09:48:30","modified_gmt":"2026-10-19T09:48:30","slug":"doktorsvorn-i-jardvisindum-muhammad-aufaristama","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardvisindum-muhammad-aufaristama\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0v\u00edsindum – Muhammad Aufaristama"},"content":{"rendered":"
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V\u00f6rnin ver\u00f0ur loku\u00f0 gestum en h\u00e6gt ver\u00f0ur a\u00f0 fylgjast me\u00f0 henni \u00ed beinni \u00fatsendingu \u00e1 \u00feessari sl\u00f3\u00f0:\u00a0https:\/\/www.youtube.com\/user\/HIvarp\/live<\/a><\/p>\n

Doktorsefni:<\/strong>\u00a0Muhammad Aufaristama<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0Hraunbrei\u00f0a Holuhrauns fr\u00e1 2014-2015: \u00c1kv\u00f6r\u00f0un \u00e1 e\u00f0liseiginleikum hraunsins me\u00f0 fj\u00f6l\u00fe\u00e6ttri fjark\u00f6nnunart\u00e6kni og margbreytilegum gagnasettum (The 2014\u20132015 lava flow field at Holuhraun: Deriving physical properties of the lava using multi remote sensing techniques and datasets)<\/p>\n

Andm\u00e6lendur:<\/strong> Dr. Chris Hecker, lektor vi\u00f0 University of Twente, Hollandi.
Dr. Catherine Neish, lektor vi\u00f0 Western University \u00ed Ontario, Kanada.<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0Dr. \u00c1rmann H\u00f6skuldsson, v\u00edsindama\u00f0ur vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3lans.<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong>
<\/strong>Dr. Magn\u00fas \u00d6rn \u00dalfarsson, pr\u00f3fessor vi\u00f0 Rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands.
Dr. Ingibj\u00f6rg J\u00f3nsd\u00f3ttir, d\u00f3sent vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.
Dr. \u00deorvaldur \u00de\u00f3r\u00f0arson, pr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Magn\u00fas Tumi Gu\u00f0mundsson, pr\u00f3fessor og deildarforseti Jar\u00f0v\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

\u00c1grip<\/strong><\/p>\n

Tilgangurinn me\u00f0 verkefninu var a\u00f0 rannsaka hraunrennsli og landform er ur\u00f0u til \u00ed eldgosinu nor\u00f0an Vatnaj\u00f6kuls 2014-2015, kennt vi\u00f0 Holuhraun. Fj\u00f6l\u00fe\u00e1tta fjark\u00f6nnunart\u00e6kni og g\u00f6gn \u00far gervitunglum og flugv\u00e9lum voru n\u00fdtt vi\u00f0 \u00farvinnslu verkefnisins. Ranns\u00f3knin sneri a\u00f0 \u00feremur megin\u00fe\u00e1ttum: (1) greiningu \u00e1 e\u00f0li varma\u00fatstreymis fr\u00e1 Holuhrauni, \u00fat fr\u00e1 innrau\u00f0ri varmageislun sem m\u00e6ld er me\u00f0 gervitunglag\u00f6gnum (2) a\u00f0greining \u00e1 mismunandi hraunyfirbor\u00f0i, \u00fat fr\u00e1 ofur-fj\u00f6lr\u00f3fsm\u00e6lingum \u00far lofti, og (3) greiningu og flokkun \u00e1 yfirbor\u00f0shrj\u00fafleika Holuhrauns \u00fat fr\u00e1 h\u00e6\u00f0arl\u00edkani er afla\u00f0 var me\u00f0 LiDAR \u00far flugv\u00e9l.
Fyrsti \u00fe\u00e1ttur beindist a\u00f0 e\u00f0li varma\u00fatstreymis \u00e1 me\u00f0an \u00e1 eldgosi st\u00f3\u00f0. Stu\u00f0st var vi\u00f0 gervitunglag\u00f6gn og m\u00e6lingar me\u00f0 FLIR-t\u00e6kni \u00e1 me\u00f0an eldgosi\u00f0 st\u00f3\u00f0 yfir. Afraksturinn er n\u00fdr hitastu\u00f0ull fyrir Landsat 8 og greiningu \u00e1 eldgosum, (TEI). Hitastu\u00f0ullinn TEI er unninn \u00fat fr\u00e1 SWIR og TIR-b\u00f6ndum Landsat 8 (b\u00f6nd 6 og 10). Me\u00f0 TEI n\u00e6st fram tvennt: (i) a\u00f0 greina \u00fer\u00f6skuld milli tveggja hitasvi\u00f0a; og (ii) a\u00f0 beita tv\u00edbanda t\u00e6kni til a\u00f0 greina hitastig innan hverrar myndeiningar (Th) af hrauninu. Hrj\u00fafleiki hraunsins hefur \u00e1hrif \u00e1 varma\u00fatstreymi og er gert r\u00e1\u00f0 fyrir honum \u00fev\u00ed me\u00f0 \u00fev\u00ed a\u00f0 greina Hurst-\u00e1hrif (H). Hurst-\u00e1hrif eru reiknu\u00f0 \u00fat fr\u00e1 radar endurkasti hraunyfirbor\u00f0s. H\u00e1tt H einkennir flatt og mj\u00fakt yfirbor\u00f0 og \u00feunna skorpu \u00e1 hrauninu, \u00e1 me\u00f0an l\u00e1gt H einkennir \u00fafi\u00f0 yfirbor\u00f0, \u00feykka skorpu og l\u00e1ga varma\u00fatgeislun. Heildarvarma\u00fatgeislun me\u00f0 \u00feessari a\u00f0fer\u00f0 er heldur vanmetin en ofmetin \u00ed samanbur\u00f0i vi\u00f0 a\u00f0rar a\u00f0fer\u00f0ir. Hins vegar er g\u00f3\u00f0 fylgni me\u00f0 m\u00e6lingum \u00ed m\u00f6rkinni og samanbur\u00f0ara\u00f0fer\u00f0um.
Annar hluti ranns\u00f3knarinnar sneri a\u00f0 t\u00falkun ofur-fj\u00f6lr\u00f3fsgreiningar \u00e1 yfirbor\u00f0i Holuhrauns. Flogi\u00f0 var yfir Holuhraun sumari\u00f0 2015 me\u00f0 ofur-fj\u00f6lr\u00f3fsm\u00e6li (AisaFENIX) um bor\u00f0 \u00ed flugv\u00e9l fr\u00e1 NERC (Natural Environment Research Council Airborne Research Facility). Vi\u00f0 greiningu \u00e1 yfirbor\u00f0i innan hverrar myndeiningar var, (i) notast vi\u00f0 a\u00f0fer\u00f0 runubundins h\u00e1markshorns k\u00faptrar keilu (SMACC) til a\u00f0 finna \u00fatm\u00f6rk ofurr\u00f3fsm\u00e6lingar, (ii) bl\u00f6ndu\u00f0 l\u00ednulega r\u00f3fgreining (LSMA) var n\u00fdtt til a\u00f0 greina styrk e\u00f0a gn\u00e6g\u00f0 innan myndeiningar. SMACC og LSMA-a\u00f0fer\u00f0irnar bj\u00f3\u00f0a upp \u00e1 mj\u00f6g hra\u00f0a greiningu \u00e1 yfirbor\u00f0i og \u00fatfellingum efna \u00e1 yfirbor\u00f0i\u00f0. Hins vegar \u00fearf a\u00f0 gera fleiri r\u00f3fm\u00e6lingar \u00e1 sta\u00f0num, svo megi \u00fer\u00f3a \u00feessa a\u00f0fer\u00f0 til framt\u00ed\u00f0ar.
\u00deri\u00f0ji \u00fe\u00e1ttur ranns\u00f3knarinnar sneri a\u00f0 \u00fev\u00ed a\u00f0 greina landfr\u00e6\u00f0ilega st\u00f6\u00f0uv\u00edsit\u00f6lu (TPI) og einv\u00ed\u00f0an Hurst-veldisv\u00edsi til a\u00f0 meta hrj\u00fafleika \u00e1 hinu endanlega yfirbor\u00f0i Holuhrauns. Vi\u00f0 \u00feessa greiningu var notast vi\u00f0 LiDAR-m\u00e6lingu af hrauninu og h\u00e6\u00f0agrunn unninn \u00fat fr\u00e1 lj\u00f3smyndum. Hrj\u00fafleikinn var metinn fyrir fj\u00f6gur meginyfirbor\u00f0 hraunsins: (1) broddahraun \u201espiny lava\u201c, (2) hrauntj\u00f6rn \u201elava pond\u201c, (3) klumpahraun \u201erubbly pahoehoe lava\u201c og (4) upptjakka\u00f0a hrauntr\u00f6\u00f0 \u201einflated channel\u201c. TPI fyrir yfirbor\u00f0 (1) og (4) gefur me\u00f0algildi sem einkennist af litlum halla og fl\u00f6tu yfirbor\u00f0i. Hrauntj\u00f6rnin einkennist af l\u00e1gum og h\u00e1um TPI-gildum er mynda bylgjukennt mynstur. Hins vegar einkennast hrj\u00fafustu yfirbor\u00f0in (3) og hraunja\u00f0rar af \u00f3reglulegu mynstri l\u00e1gra og h\u00e1rra TPI-gilda. Hrj\u00fafleikastu\u00f0ull \u00feessara yfirbor\u00f0a H, er \u00e1 bilinu 0.30 \u00b1 0.05 til 0.76 \u00b1 0.04. Mestur er hrj\u00fafleiki kubbahrauna og minnstur er hrj\u00fafleiki \u00feaninnar hrauntra\u00f0ar. Hurts-veldisv\u00edsir Holuhrauns er n\u00e6rri 0.5, en \u00fea\u00f0 er \u00ed mj\u00f6g g\u00f3\u00f0u samr\u00e6mi vi\u00f0 fyrri ranns\u00f3knir.
\u00cd heild gefur verkefni\u00f0 mikilv\u00e6ga s\u00fdn \u00e1 notagildi fjark\u00f6nnunara\u00f0fer\u00f0a vi\u00f0 raunt\u00edmaeftirlit me\u00f0 hraungosum, m.a. me\u00f0 \u00fer\u00f3un stu\u00f0la sem munu n\u00fdtast vi\u00f0 atbur\u00f0i framt\u00ed\u00f0ar. \u00de\u00e1 voru tengsl hraunmyndana vi\u00f0 \u00fdmsa eiginleika eldgosa sk\u00fdr\u00f0, sem aftur getur gefi\u00f0 v\u00edsbendingar um e\u00f0li fyrri atbur\u00f0a.<\/p>\n

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

Muhammad Aufaristama er f\u00e6ddur og uppalinn \u00ed Ind\u00f3nes\u00edu. Hann lauk BS-pr\u00f3fi \u00ed jar\u00f0e\u00f0lisfr\u00e6\u00f0i fr\u00e1 Padjadjaran-h\u00e1sk\u00f3lanum \u00ed Bandung. Hann lauk s\u00ed\u00f0an sameiginlegu meistarapr\u00f3fi vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og Twente University \u00ed Hollandi \u00ed athugun \u00e1 eiginleikum jar\u00f0ar me\u00f0 fjark\u00f6nnunart\u00e6kni. Meistaran\u00e1m hans var styrkt af Menntam\u00e1lasj\u00f3\u00f0i Ind\u00f3nes\u00edu og GEM samstarfsverkefni H\u00e1sk\u00f3la \u00cdslands og Twente University \u00ed Hollandi.<\/p>\n

Muhammad h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00ed j\u00fal\u00ed 2016. Doktorsn\u00e1m hans var styrkt af Futurvolc, Vetools, Eurovolc, Vinum Vatnaj\u00f6kuls, Ofanfl\u00f3\u00f0asj\u00f3\u00f0i og Menntam\u00e1lasj\u00f3\u00f0i Ind\u00f3nes\u00edu.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1967,"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":"2020-04-29T14:00:00+00:00","_phd_date_end":"2020-04-29T16:00:00+00:00","_phd_location":"Ver\u00f6ld - H\u00fas Vigd\u00edsar 023","_phd_admission":"Vi\u00f0bur\u00f0inum ver\u00f0ur streymt","_phd_thesis_title":"Hraunbrei\u00f0a Holuhrauns fr\u00e1 2014-2015: \u00c1kv\u00f6r\u00f0un \u00e1 e\u00f0liseiginleikum hraunsins me\u00f0 fj\u00f6l\u00fe\u00e6ttri fjark\u00f6nnunart\u00e6kni og margbreytilegum gagnasettum (The 2014\u20132015 lava flow field at Holuhraun: Deriving physical properties of the lava using multi remote sensing techniques and datasets)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_jardvisindum_muhammad_aufaristama","_phd_source_node_id":"338011","_phd_source_type":"vidburdir","_phd_member_id":564,"footnotes":""},"phd_school":[113,93],"phd_discipline":[116],"class_list":["post-6127","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-jardvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-jardvisindum"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6127","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\/6127\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1967"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6127"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6127"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}