Jökull - 01.10.1998, Page 39

Table 1. Location and geometry of outlets of Vatnajökull and glacial rivers. L = length along a central flow line, hmax= maxi-
mum elevation, hmin = lowest elevation.
- Tölur sem lýsa einkennum skriðjökla Vatnajökuls og jökuláa semfallafrá honum.
Glacier/river Jökullljökulá Location Staðsetning Aspect Ice drainage bmnlísasvœði Water drainage basin /vatnasvæSi River basin
Area L ^max ^min Area L ^max ^niin Gauge Area
km2 km m m km2 km m m km2
Síðujökull/ HverMjót 6415 N 1750 W SSW 380 50 1700 600 350 50 1700 600
Tungnaárjökull/ Tungnaá 6420N 18 00 W W 308 40 1660 690 141 20 1360 690 Vatnaöldur 1131
Sylgjujökull W 175 20 1650 880 75 15 1550 880
Köldukvíslar- jökull/ Kaldakvísl 6435N 1740 W W 313 25 2010 880 359 25 2010 880 Þveralda 834
Dyngjujökull/ Jökulsá á Fjöllum 6440N 1710 W N 1040 45 1990 730 1144 45 2010 730 Upptyppingar 1966
Brúarjökull/ 1) Kverká and Kreppa, 2) Jökulsá á Brú 6430N 1620 W N 1695 55 1930 580 1)302 2)1406 1) 35 2) 55 1) 1930 2) 1620 1) 690 2) 580 1) Lónshnúkur 2) Brú 1)826 2) 2090
Grímsvötn 6425N 17 20 W S 160 15 1760 1380
50% of the entire ice cap and extend in elevation from
600 m to 2000 m (Table 1, Figs. 1, 2 and 3). On Síðu-
jökull, which flows toward southwest from about
1700 m to 600 m, mass balance measurements were
conducted in 1991-1992 and 1992-1993 but since
then a surge has made further measurements impossi-
ble. On Tungnaárjökull, a western outlet of Vatna-
jökull which drains from an elevation of 1660 m to
690 m, measurements were carried out in 1991-92,
1992-93 and 1993-94 but since then a surge of the
glacier has also hindered mass balance measure-
ments. Köldukvíslarjökull, a northwestern outlet of
Vatnajökull, drains from an elevation of 2010 m at
Bárðarbunga to 880 m. The two major outlets of
northern Vatnajökull have been studied. First,
Dyngjujökull, representing the central northem part of
Fig. 2. Ice (a) and water (b) drainage basins on Vatnajökull and names of rivers draining the glaciers.
- Isa- og vatnaskil á Vatnajökli og nöfn vatnsfalla sem frá honum renna.
JOKULL, No. 45, 1998
37