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The article reports on the study conducted by Douglas Mair and colleagues on the diurnal fluctuations in glacier ice deformation in Haut Glacier d'Arolla, Switzerland. Researchers measured surface velocity, ice deformation and proglacial stream discharge to determine diurnal patterns of variation. They analysed these data to understand better the relationship between hydraulically induced basal motion and glacier ice deformation over short timescales. Result reveals that the hydraulically induced localized basal slippery spots are created over diurnal cycles, thus causing enhanced basal motion and variable glacier speed-up.

Presents techniques to identify borehole water sources and to reconstruct pattern of water circulation within boreholes in Switzerland. Types of borehole drainage and its influence on the interpretations of borehole water levels, borehole water quality and borehole dye traces; Subglacial hydrology; Borehole salt tracing; Electric conductivity profiling.