Jökull - 01.01.2004, Page 25

Glaciological application of InSAR topography data of W-Vatnajökull
Figure 5. Top: The ratio between the water volumes draining into the river branches of Skaftá, estimated from
the summer balance, assuming that the northeastern part of the river basin drains into the eastern branch (broken
lines) and western branch (grey lines). The double curves denote maximum and minimum runoff attributed to
areas which could either belong to Skaftá or other river basins, (Figures 2 and 4). The average ratio between
the two branches calculated from discrete measurements is shown with a black line (Bjarni Kristinsson, pers.
comm., 2003). Bottom: The estimated average summer flow in Skaftá (both branches) due to summer balance
(grey curves). The black curve shows the summer flow at Sveinstindur (Figure 3) measured by the National
Energy Authority, averaged over June-September. Water from jökulhlaups is excluded. The runoff for June
and July 1997, not measured at Sveinstindur, was estimated using data from Skaftárdalur. – Efst: Efri og neðri
mörk á hlutfalli metins sumarrennslis vestari og eystri Skaftárkvíslar m.v. vatnaskil á 2. mynd (brotinn ferill)
og 4. mynd (grár ferill). Svarta línan sýnir mælt hlutfall, gögn Orkustofnunar. Neðst: Efri og neðri mörk á
meðal sumarrennsli metnu frá sumarafkomu (grár línur). Mælt meðalrennsli við Sveinstind (svört lína) er sýnt
til samanburðar.
JÖKULL No. 54 25