ABSTRACT
There are 515 m of tourist paths to display the ice, including a tunnel cut through it that reveals the layered structure (Figure 3). Modern ice behaviour is closely monitored to prevent degradation due to visitors. Between 1981 and 1990, floor ice was observed to increase by 3-115 mm a−1 at different locations, much of the water deriving from the melt of nearby wall ice at 1−27 mm a−l. The mass was also deforming plastically (flowing) at rates of ~10 mm a−1 horizontally and up to 27 mm a−1 vertically downwards (Lalkovic, 1995).
