Jökull


Jökull - 31.12.2001, Side 17

Jökull - 31.12.2001, Side 17
Geomorphology of Odáðahraun ÁGRIP LANDMÓTUN í ÓDÁÐAHRAUNI í LJÓSI LANDSAT TM GERVITUNGLAMYNDA Mikil jarðvegseyðing hefur átt sér stað norðaustan Vatnajökuls síðustu aldirnar. Gervitunglamyndir geta komið að góðum notum við flokkun landslagsgerða og mati á rofþáttum. Skipta má landslags- og yfir- borðsgerðum svæðisins í 3 meginflokka (hraun, set og annað) og 19 undirflokka. Marga undirflokkana má auðveldlega greina á gervitunglamyndunum. Land- sat TM myndir af svæðinu frá Dyngjujökli í suðri og norður í Öxarfjörð sem teknar voru í júlí 1992 leiða m.a. í ljós hvernig foksandsgeirarnir liggja í Ódáðahrauni og hvar leifar gróðurs er að finna. REFERENCES Arnalds, A. 1987. Ecosystem disturbance in Iceland. Arc- tic and Alpine Res. 19, 508-513. Arnalds, Ó. 1992a. Sandleiðir á Norðausturlandi. Grœðum ísland, Árbók IV, 145-149. Arnalds, Ó. 1992b. Jarðvegsleifar í Ódáðahrauni. Grœðum ísland, Árbók IV, 159-164. Arnalds, Ó. 2000. The Icelandic rofabard soil erosion fea- tures. Earth Surface Processes and Landforms 25, 17- 28. Amalds, Ó., E. F. Þórarinsdóttir, S. Metúsalemsson, Á. Jónsson, E. Grétarsson and A. Árnason 1997. Jarðvegsrof á Islandi. Landgræðsla ríkisins and Rannsóknastofnun landbúnaðarins, 157 pp. Ashwell, I. Y. 1986. Meteorology and duststorms in cen- tral Iceland. Arctic and Alpine Res. 18, 223-234. Björnsson, A. 1985. Dynamics of crustal rifting in NE Ice- land. J. Geophys. Res. 90, 10,151-10,162. Björnsson, H. 1992. Jökulhlaups in Iceland: prediction, characteristics and simulation. Ann. Glaciology 16, 95-106. Björnsson, H. and P. Einarsson, 1991. Volcanoes be- neath Vatnajökull, Iceland: Evidence from radio echo- sounding, earthquakes and jökulhlaups. Jökull, 40, 147-168. Dugmore, A. J. and P. C. Buckland 1991. Tephrochronol- ogy and late Holocene soil erosion in lceland. In J. Maizels and C. Caseldine (eds.): Environmental Change in Iceland, 147-159. Kluwer, Dordrecht. Einarsson, Þ. 1994. Geology oflceland, Rocks and Land- scape. Mál og Menning, Reykjavík. 309 pp. Elíasson, S. 1977. Molar um Jökulsárhlaup og Ásbyrgi. Náttúrufrœðingurinn 47, 160-179. Guðjónsson, G. and E. Gíslason 1998. Vegetation Map of Iceland 1:500 000. General Overview. Icelandic Insti- tute of Natural History, Reykjavík (lst edition). Guðmundsson, A. 1986. Mechanical aspects of postglacial volcanism and tectonics of the Reykjanes Peninsula, Southwest Iceland. J. Geophys. Res.} 91, 12711- 12721. Guðmundsson, A. and K. Báckström 1991. Structure and development of the Sveinagja graben, Northeast Ice- land. Tectonophysics 200, 111-125. Guðmundsson, M. T., F. Sigmundsson and H. Björns- son 1997. Ice-volcano interaction of the 1996 Gjálp subglacial eruption, Vatnajökull, Iceland. Nature 389, 954-957. Hallgrímsson, H. 1969. Útbreiðsla planta á lslandi með tilliti til loftslags. Náttúrufrœðingurinn 39, 17-31. fsaksson, S. P. 1985. Stórhlaup í Jökulsá á Fjöllum á fyrri hluta 18. aldar. Náttúrufrœðingurinn 54, 165-191. Jóhannesson, H. and K. Sæmundsson 1998. Geological Map of Iceland, 1:500 000. Tectonics. Icelandic In- stitute of Natural History, Reykjavík. Káyhkö, J. A. 2000. Landscape processes in the Ódáða- hraun region, north-eastern Iceland. In Russell, A. J. and P. M. Marren, (eds.) Iceland 2000. Modern Pro- cesses And Past Environments (Abstracts), University of Keele, p. 51. Káyhkö, J. and P. Pellikka 1994. Remote sensing of the impact of reindeer grazing on vegetation in northern Fennoscandia using SPOT XS data. Polar Res. 13, 115-124. Káyhkö, J. and P. Worsley 1997. Sediment distribution and transport processes on Holocene lava fields in north- eastern Iceland. Supplementi di Geografia Fisica e Di- namica Quaternaria, Supplemento III, Tomo 1, p. 226 (Abstracts of the fourth international conference on geomorphology, Bologna, Italy, 1997). Kilburn, C. R. J. and R. M. C. Lopes 1991. General pat- terns of flow field growth: aa and blocky lavas. J. Geo- phys. Res. 96, 19721-19732. Kristmannsdóttir, H., A. Björnsson, S. Pálsson and Á. E. Sveinbjörnsdóttir 1999. The impact of the 1996 sub- glacial volcanic eruption in Vatnajökull on the river Jökulsá á Fjöllum, North Iceland. J. Volcanol. and Geothermal Res. 92, 359-372. JÖKULLNo. 51 15
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