{"id":6230,"date":"2026-10-19T09:48:39","date_gmt":"2026-10-19T09:48:39","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsfyrirlestur-i-landfraedi-theresa-bonatotzky\/"},"modified":"2026-10-19T09:48:39","modified_gmt":"2026-10-19T09:48:39","slug":"doktorsfyrirlestur-i-landfraedi-theresa-bonatotzky","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsfyrirlestur-i-landfraedi-theresa-bonatotzky\/","title":{"rendered":"Doktorsfyrirlestur \u00ed landfr\u00e6\u00f0i – Theresa Bonatotzky"},"content":{"rendered":"
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Streymi<\/strong><\/a><\/p>\n

Doktorsefni:<\/strong>\u00a0Theresa Bonatotzky<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0Ve\u00f0run gj\u00f3sku og \u00e1hrif hennar \u00e1 jar\u00f0vegsmyndun sunnan Vatnaj\u00f6kuls (Weathering of volcanic tephra and its impact on soil formation south of Vatnaj\u00f6kull glacier)<\/p>\n

Andm\u00e6lendur:<\/strong>
<\/strong>Dr. Randy Dahlgren, pr\u00f3fessor vi\u00f0 University of California Davis, Bandar\u00edkjunum
Dr. Goran Durn, pr\u00f3fessor vi\u00f0 University of Zagreb, Kr\u00f3at\u00edu<\/p>\n

Lei\u00f0beinendur:
<\/strong>Dr. Gu\u00f0r\u00fan G\u00edslad\u00f3ttir, pr\u00f3fessor vi\u00f0 L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands
Dr. Franz Ottner, pr\u00f3fessor vi\u00f0 BOKU University, Austurr\u00edki
Dr. Egill Erlendsson, pr\u00f3fessor vi\u00f0 L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong>
Dr. Sigur\u00f0ur Reynir G\u00edslason, v\u00edsindama\u00f0ur vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3lans
Dr. Prof. Franz Zehetner, d\u00f3sent vi\u00f0 BOKU University \u00ed V\u00edn, Austurr\u00edki<\/p>\n

Fyrirlestrinum st\u00fdrir:<\/strong>\u00a0Dr. Anna D\u00f3ra S\u00e6\u00fe\u00f3rsd\u00f3ttir, pr\u00f3fessor og deildarforseti L\u00edf- og\u00a0 umhverfisv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Um er a\u00f0 r\u00e6\u00f0a sameiginlega doktorsgr\u00e1\u00f0u \u00e1 milli H\u00e1sk\u00f3la \u00cdslands og BOKU University og f\u00f3r v\u00f6rnin fram vi\u00f0 BOKU University \u00ed j\u00fan\u00ed s\u00ed\u00f0astli\u00f0num.<\/p>\n

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

T\u00ed\u00f0 eldgos me\u00f0 tilheyrandi gj\u00f3skufalli og st\u00f6\u00f0ugt \u00e1fok vindborinna efna af \u00f3l\u00edkum uppruna setja mestan svip \u00e1 jar\u00f0vegs\u00fer\u00f3un \u00e1 \u00cdslandi. Skortur er \u00e1 \u00feekkingu \u00e1 ve\u00f0run, myndun og ummyndun steinda \u00ed gj\u00f3sku \u00ed \u00edslenskum jar\u00f0vegi \u00ed kj\u00f6lfar gj\u00f3skufalls. \u00cd \u00feessari ritger\u00f0 eru ni\u00f0urst\u00f6\u00f0ur umfangsmikillar ranns\u00f3knar kynntar, sem tekur til steindafr\u00e6\u00f0i og jar\u00f0vegs\u00fer\u00f3unar \u00ed mismunandi jar\u00f0vegsflokkum og \u00ed breytilegu umhverfi jar\u00f0vegsmyndunar.
Ranns\u00f3knarsv\u00e6\u00f0i\u00f0 er \u00e1 virku eldfjallasv\u00e6\u00f0i sunnan vi\u00f0 Vatnaj\u00f6kul \u00e1 Su\u00f0austurlandi. \u00c1 \u00f6llum s\u00fdnat\u00f6kust\u00f6\u00f0um sem nota\u00f0ir voru \u00ed ranns\u00f3kninni finnast lj\u00f3slitu\u00f0, s\u00far gj\u00f3ska fr\u00e1 \u00d6r\u00e6faj\u00f6kulsgosi fr\u00e1 1362 e.Kr. og d\u00f6kklitu\u00f0, bas\u00edsk gj\u00f3ska \u00far gosi \u00ed Vei\u00f0iv\u00f6tnum \u00e1ri\u00f0 1477 e.Kr.
\u00d6ll jar\u00f0vegss\u00fdni \u00ed \u00feessari ranns\u00f3kn reyndust s\u00far og sandkennd. Hlutfall Feo\/Fed > 0.75 gefur til kynna a\u00f0 efnave\u00f0run og jar\u00f0vegs\u00fer\u00f3un s\u00e9 skammt \u00e1 veg komin. Meginhluti agna \u00ed leirst\u00e6r\u00f0 felst \u00ed myndlausum (e. amorphous) e\u00f0a \u00f3fullkomlega krist\u00f6llu\u00f0um (e. poorly crystalline) efnum (all\u00f3fan og ferrih\u00fddr\u00edt). Engu a\u00f0 s\u00ed\u00f0ur fundust ummerki um lags\u00edlik\u00f6t \u00e1 \u00f6llum s\u00fdnat\u00f6kust\u00f6\u00f0um (smekt\u00edt, steindir me\u00f0 h\u00fddrox\u00fdl-j\u00f3nir milli laganna og s\u00ed\u00f0-steindina kl\u00f3r\u00edt). L\u00edfr\u00e6n efni voru r\u00e1\u00f0andi \u00fe\u00e1ttur jar\u00f0vegs\u00fer\u00f3unar \u00ed m\u00f3j\u00f6r\u00f0 (e. histosol), en flutningur gj\u00f3sku me\u00f0 vindi yfir langar vegalengdir, tilflutningur gj\u00f3sku og sta\u00f0bundnir umhverfis\u00fe\u00e6ttir r\u00e9\u00f0u meiru um jar\u00f0vegs\u00fer\u00f3un og ummyndun steinda en frumsamsetning m\u00f3\u00f0urefnisins. \u00cdslenskur jar\u00f0vegur \u00fer\u00f3ast \u00ed s\u00edbreytilegu umhverfi. Ekkert jar\u00f0vegssni\u00f0anna m\u00e1tti skilgreina sem vel \u00fer\u00f3a\u00f0 og \u00f6ll s\u00fdndu \u00feau ummerki um rask og \u00e1hrif fr\u00e1 ytri umhverfis\u00fe\u00e1ttum.<\/p>\n

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

Theresa Bonatotzky f\u00e6ddist \u00ed V\u00edn \u00ed Austurr\u00edki 1983. H\u00fan lauk dipl\u00f3mapr\u00f3fi \u00ed \u201eLand- og vatnsstj\u00f3rnun\u201c fr\u00e1 BOKU University \u00ed V\u00edn \u00e1ri\u00f0 2011. \u00cd j\u00fan\u00ed 2021 lauk h\u00fan sameiginlegu doktorsn\u00e1mi fr\u00e1 H\u00e1sk\u00f3la \u00cdslands og fr\u00e1 BOKU University.
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