TY JOUR TI Mechanical Anthropogenic Impact on Natural Slopes of Coastal Dunes KW Coastal dune KW Trampling KW Dune slopes KW Geometric transformation vector KW Morphodynamics JO Russian Journal of Earth Sciences AU Danchenkov, A.R. AU Piterniex, E.D. AU Belov, N.S. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences