Dynamics of colluvial Processes in the Del-Urekchen Ridge (Sea of Okhotsk Northern coast) based on Lichenometric Data
The paper presents the results of the colluvial cone (talus) dynamics obtained by using the lichenometric method in the central part of the Del-Urekchen ridge. The researched colluvial cone morphosculpture is characterized by the availability of a debris source, a debris transit zone, and an accumulation zone. By laying profiles at lichenometric sites, 100 random debris with the largest specimens of Rhizocarpon sp. at each, the dynamic age and the average annual rate of colluvial material movement have been established. By the lichenometric data harmonic analysis, gravitational slope processes have been found cyclic, with the most significant 24-year cycle.