MODELING MORPHOLOGICAL FEATURES OF ABRASION LANDSLIDE COASTS IN CRYOLITHOZONE

Victorov A.S.¹

¹Sergeev Institute of Environmental Geoscience RAS (IEG RAS) Ulansky per. 13, bld. 2, Moscow, 101000

This research is aimed at the behavior analysis of quantitative morphological features at abrasion landslide coasts in cryolithozone and their empirical investigation. The research deals with the morphological pattern of the upper landslide segment. The arcs limiting the landslide body and their chords are the characteristic features of this part of landslide bodies at the border with the watershed. Five key sites at the Kanin Nos and Yamal peninsulas were studied. The analysis performed proved that the probabilistic distribution of chord lengths observed at each moment of time for the entire set of landslides differs from that of chord lengths for young landslides formed due to partial and complete erasure of landslide bodies.The results of mathematical modeling in relatively uniform abrasion slope in regards to their geology and permafrost reveal the state of dynamic balance, which is manifested in the stabilization of landslide average density and landslide size probabilistic distribution along the slope strike. The analytical relationship is obtained between the probability distribution of chord lengths for emerging young landslides and the probability distribution of chord lengths for all presented landslides, including those partially erased by later landslides, as well as between the landslide average density along the coastline and the chord length distribution parameters for the young landslides. Empirical data analysis for the key sites demonstrates a lognormal distribution for all the measured chord lengths. 

Key words: mathematical modeling of landslide morphological features, abrasion coasts, mathematical morphology of landscape, dynamic equilibrium of coasts

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