26. July 2008
snapshot from Kapp Linne, western
person for additional information: Hanne
and photos by Hanne H. Christiansen
year ago the TSP Norway project established
a solifluction station on a large solifluction lobe. This lobe flows from
the west side of the mountain range Griegaksla onto the strandflat.
have now recovered the first full year of data from the station, which have
worked successfully. The winter 2007-2008 was, however, very windy so the
automatic camera, which records snow depth around the station flew away in early
November 2007, just as the polar night began. We have now repaired and enforced
the camera and it is back in operation at the site, ready for the coming winter.
Also the top of the battery box ensuring the power for the station disappeared
during winter, but no data was lost.
solifluction station photographed on 27 July (left) and
(right) by the automatic camera.
first full year of data gives us a first snapshot of the solifluction activity
here in the Kapp Linne area on the west coast of the
Solifluction is active from early June to the end of October, when melting of
the active layer occurs and until the ca. 1.5 m thick layer again is completely
frozen in the beginning of winter. During winter there is no movement of the
ground surface, when it is completely frozen. The solifluction station has
recorded 9 cm ground heave during freeze-up of the ground in the autumn, and
already 11 cm of settlement again as the active layer thawed this summer. This
annual movement is due to the formation of ice layers in the active layer. The
resulting downslope movement this summer was 4.4 cm.
in some years the active layer becomes deeper due e.g. to a very warm summer,
the resettlement can be larger than heaving, which lead to ground lowering and
increased downhill movement.