Jökull - 01.12.1972, Page 85

Jökulhlaup í Köldukvísl
SIGMUNDUR FREYSTE I NSSON ,
VERKFRÆÐISTOFA SIGURÐAR THORODDSEN S.F., REYKJAVÍK
ABSTRACT
In the airea called Hamarskriki, west of Mt.
Hamarinn in weslern Vatnajökull, betioeen the
outlet glaciers Köldukvíslarjökull and Tungnár-
jökull, two glacier dammed lakes, Hamarslón
artd Hvitalón, are known to have existed from
time to time. The situation of these lakes,
according to ma.ps 1939 and 1945, aerial photo-
graphs 1960 and field reconnaissance 1970, is
shown in Figs. 1—4. The glaciers Köldukvíslar-
jökull and Tungnárjökull are surging glaciers
p.,nd the lakes have been dammed when the
glaciers have advanced. During recession of the
glaciers periodic jökulhlaups have occurred.
Discharge hydrographs of Kaldakvisl River for
some of these jökulhlaups are shown in Fig. 5.
These floods are small in magnitude but a
considerably bigger flood, tota,l volume about
20 Gl occurred last summer (Aug. 1—3, 1972).
This flood originated in Hamarslón Lake. The
damming of the lake this time was presumably
Myncl 1. Hamarskriki og
umhverfi 1939. Uppdrátt-
ur íslands, Blað 76, hluti.
Fig. 1. Hamarskriki and
vicinity 1939. Map of Ice-
land, sheet 76, part.

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JÖKULL 22. ÁR 83