The following reference reviews
methods for monitoring active-layer thickness and related parameters.
Nelson, F.E., and Hinkel, K.M. (2003). Methods for measuring active-layer
thickness. In: Humlum, O. and Matsuoka, N. (eds.) A Handbook on Periglacial
Field Methods. Longyearbyen, Norway: University of the North in Svalbard.
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The original CALM protocols, published in 1996 as part of the ITEX Manual, are:
Active Layer Monitoring
includes discussion on sampling designs,
probing, frost tubes and soil temperature measurements.
including stationary and spatial measurements
using gravimetric method and Vitel soil moisture probes.
Ground Subsidence and Heave
reporting geographic coordinates of CALM sites